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Subject[119/262] [media] DiBcom: protect the I2C bufer access
3.0-stable review patch.  If anyone has any objections, please let me know.

------------------
From: Patrick Boettcher <Patrick.Boettcher@dibcom.fr>

commit 79fcce3230b140f7675f8529ee53fe2f9644f902 upstream.

This patch protects the I2C buffer access in order to manage concurrent
access. This protection is done using mutex.
Furthermore, for the dib9000, if a pid filtering command is
received during the tuning, this pid filtering command is delayed to
avoid any concurrent access issue.

Cc: Mauro Carvalho Chehab <mchehab@redhat.com>
Cc: Florian Mickler <florian@mickler.org>
Signed-off-by: Olivier Grenie <olivier.grenie@dibcom.fr>
Signed-off-by: Patrick Boettcher <Patrick.Boettcher@dibcom.fr>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

---
drivers/media/dvb/frontends/dib0070.c | 37 ++++--
drivers/media/dvb/frontends/dib0090.c | 70 +++++++++--
drivers/media/dvb/frontends/dib7000m.c | 27 ++++
drivers/media/dvb/frontends/dib7000p.c | 32 ++++-
drivers/media/dvb/frontends/dib8000.c | 72 ++++++++++-
drivers/media/dvb/frontends/dib9000.c | 164 +++++++++++++++++++++++----
drivers/media/dvb/frontends/dibx000_common.c | 76 ++++++++++--
drivers/media/dvb/frontends/dibx000_common.h | 1
8 files changed, 412 insertions(+), 67 deletions(-)
--- a/drivers/media/dvb/frontends/dib0070.c
+++ b/drivers/media/dvb/frontends/dib0070.c
@@ -27,6 +27,7 @@
#include <linux/kernel.h>
#include <linux/slab.h>
#include <linux/i2c.h>
+#include <linux/mutex.h>

#include "dvb_frontend.h"

@@ -78,10 +79,18 @@ struct dib0070_state {
struct i2c_msg msg[2];
u8 i2c_write_buffer[3];
u8 i2c_read_buffer[2];
+ struct mutex i2c_buffer_lock;
};

-static uint16_t dib0070_read_reg(struct dib0070_state *state, u8 reg)
+static u16 dib0070_read_reg(struct dib0070_state *state, u8 reg)
{
+ u16 ret;
+
+ if (mutex_lock_interruptible(&state->i2c_buffer_lock) < 0) {
+ dprintk("could not acquire lock");
+ return 0;
+ }
+
state->i2c_write_buffer[0] = reg;

memset(state->msg, 0, 2 * sizeof(struct i2c_msg));
@@ -96,13 +105,23 @@ static uint16_t dib0070_read_reg(struct

if (i2c_transfer(state->i2c, state->msg, 2) != 2) {
printk(KERN_WARNING "DiB0070 I2C read failed\n");
- return 0;
- }
- return (state->i2c_read_buffer[0] << 8) | state->i2c_read_buffer[1];
+ ret = 0;
+ } else
+ ret = (state->i2c_read_buffer[0] << 8)
+ | state->i2c_read_buffer[1];
+
+ mutex_unlock(&state->i2c_buffer_lock);
+ return ret;
}

static int dib0070_write_reg(struct dib0070_state *state, u8 reg, u16 val)
{
+ int ret;
+
+ if (mutex_lock_interruptible(&state->i2c_buffer_lock) < 0) {
+ dprintk("could not acquire lock");
+ return -EINVAL;
+ }
state->i2c_write_buffer[0] = reg;
state->i2c_write_buffer[1] = val >> 8;
state->i2c_write_buffer[2] = val & 0xff;
@@ -115,9 +134,12 @@ static int dib0070_write_reg(struct dib0

if (i2c_transfer(state->i2c, state->msg, 1) != 1) {
printk(KERN_WARNING "DiB0070 I2C write failed\n");
- return -EREMOTEIO;
- }
- return 0;
+ ret = -EREMOTEIO;
+ } else
+ ret = 0;
+
+ mutex_unlock(&state->i2c_buffer_lock);
+ return ret;
}

#define HARD_RESET(state) do { \
@@ -734,6 +756,7 @@ struct dvb_frontend *dib0070_attach(stru
state->cfg = cfg;
state->i2c = i2c;
state->fe = fe;
+ mutex_init(&state->i2c_buffer_lock);
fe->tuner_priv = state;

if (dib0070_reset(fe) != 0)
--- a/drivers/media/dvb/frontends/dib0090.c
+++ b/drivers/media/dvb/frontends/dib0090.c
@@ -27,6 +27,7 @@
#include <linux/kernel.h>
#include <linux/slab.h>
#include <linux/i2c.h>
+#include <linux/mutex.h>

#include "dvb_frontend.h"

@@ -196,6 +197,7 @@ struct dib0090_state {
struct i2c_msg msg[2];
u8 i2c_write_buffer[3];
u8 i2c_read_buffer[2];
+ struct mutex i2c_buffer_lock;
};

struct dib0090_fw_state {
@@ -208,10 +210,18 @@ struct dib0090_fw_state {
struct i2c_msg msg;
u8 i2c_write_buffer[2];
u8 i2c_read_buffer[2];
+ struct mutex i2c_buffer_lock;
};

static u16 dib0090_read_reg(struct dib0090_state *state, u8 reg)
{
+ u16 ret;
+
+ if (mutex_lock_interruptible(&state->i2c_buffer_lock) < 0) {
+ dprintk("could not acquire lock");
+ return 0;
+ }
+
state->i2c_write_buffer[0] = reg;

memset(state->msg, 0, 2 * sizeof(struct i2c_msg));
@@ -226,14 +236,24 @@ static u16 dib0090_read_reg(struct dib00

if (i2c_transfer(state->i2c, state->msg, 2) != 2) {
printk(KERN_WARNING "DiB0090 I2C read failed\n");
- return 0;
- }
+ ret = 0;
+ } else
+ ret = (state->i2c_read_buffer[0] << 8)
+ | state->i2c_read_buffer[1];

- return (state->i2c_read_buffer[0] << 8) | state->i2c_read_buffer[1];
+ mutex_unlock(&state->i2c_buffer_lock);
+ return ret;
}

static int dib0090_write_reg(struct dib0090_state *state, u32 reg, u16 val)
{
+ int ret;
+
+ if (mutex_lock_interruptible(&state->i2c_buffer_lock) < 0) {
+ dprintk("could not acquire lock");
+ return -EINVAL;
+ }
+
state->i2c_write_buffer[0] = reg & 0xff;
state->i2c_write_buffer[1] = val >> 8;
state->i2c_write_buffer[2] = val & 0xff;
@@ -246,13 +266,23 @@ static int dib0090_write_reg(struct dib0

if (i2c_transfer(state->i2c, state->msg, 1) != 1) {
printk(KERN_WARNING "DiB0090 I2C write failed\n");
- return -EREMOTEIO;
- }
- return 0;
+ ret = -EREMOTEIO;
+ } else
+ ret = 0;
+
+ mutex_unlock(&state->i2c_buffer_lock);
+ return ret;
}

static u16 dib0090_fw_read_reg(struct dib0090_fw_state *state, u8 reg)
{
+ u16 ret;
+
+ if (mutex_lock_interruptible(&state->i2c_buffer_lock) < 0) {
+ dprintk("could not acquire lock");
+ return 0;
+ }
+
state->i2c_write_buffer[0] = reg;

memset(&state->msg, 0, sizeof(struct i2c_msg));
@@ -262,13 +292,24 @@ static u16 dib0090_fw_read_reg(struct di
state->msg.len = 2;
if (i2c_transfer(state->i2c, &state->msg, 1) != 1) {
printk(KERN_WARNING "DiB0090 I2C read failed\n");
- return 0;
- }
- return (state->i2c_read_buffer[0] << 8) | state->i2c_read_buffer[1];
+ ret = 0;
+ } else
+ ret = (state->i2c_read_buffer[0] << 8)
+ | state->i2c_read_buffer[1];
+
+ mutex_unlock(&state->i2c_buffer_lock);
+ return ret;
}

static int dib0090_fw_write_reg(struct dib0090_fw_state *state, u8 reg, u16 val)
{
+ int ret;
+
+ if (mutex_lock_interruptible(&state->i2c_buffer_lock) < 0) {
+ dprintk("could not acquire lock");
+ return -EINVAL;
+ }
+
state->i2c_write_buffer[0] = val >> 8;
state->i2c_write_buffer[1] = val & 0xff;

@@ -279,9 +320,12 @@ static int dib0090_fw_write_reg(struct d
state->msg.len = 2;
if (i2c_transfer(state->i2c, &state->msg, 1) != 1) {
printk(KERN_WARNING "DiB0090 I2C write failed\n");
- return -EREMOTEIO;
- }
- return 0;
+ ret = -EREMOTEIO;
+ } else
+ ret = 0;
+
+ mutex_unlock(&state->i2c_buffer_lock);
+ return ret;
}

#define HARD_RESET(state) do { if (cfg->reset) { if (cfg->sleep) cfg->sleep(fe, 0); msleep(10); cfg->reset(fe, 1); msleep(10); cfg->reset(fe, 0); msleep(10); } } while (0)
@@ -2440,6 +2484,7 @@ struct dvb_frontend *dib0090_register(st
st->config = config;
st->i2c = i2c;
st->fe = fe;
+ mutex_init(&st->i2c_buffer_lock);
fe->tuner_priv = st;

if (config->wbd == NULL)
@@ -2471,6 +2516,7 @@ struct dvb_frontend *dib0090_fw_register
st->config = config;
st->i2c = i2c;
st->fe = fe;
+ mutex_init(&st->i2c_buffer_lock);
fe->tuner_priv = st;

if (dib0090_fw_reset_digital(fe, st->config) != 0)
--- a/drivers/media/dvb/frontends/dib7000m.c
+++ b/drivers/media/dvb/frontends/dib7000m.c
@@ -11,6 +11,7 @@
#include <linux/kernel.h>
#include <linux/slab.h>
#include <linux/i2c.h>
+#include <linux/mutex.h>

#include "dvb_frontend.h"

@@ -55,6 +56,7 @@ struct dib7000m_state {
struct i2c_msg msg[2];
u8 i2c_write_buffer[4];
u8 i2c_read_buffer[2];
+ struct mutex i2c_buffer_lock;
};

enum dib7000m_power_mode {
@@ -69,6 +71,13 @@ enum dib7000m_power_mode {

static u16 dib7000m_read_word(struct dib7000m_state *state, u16 reg)
{
+ u16 ret;
+
+ if (mutex_lock_interruptible(&state->i2c_buffer_lock) < 0) {
+ dprintk("could not acquire lock");
+ return 0;
+ }
+
state->i2c_write_buffer[0] = (reg >> 8) | 0x80;
state->i2c_write_buffer[1] = reg & 0xff;

@@ -85,11 +94,21 @@ static u16 dib7000m_read_word(struct dib
if (i2c_transfer(state->i2c_adap, state->msg, 2) != 2)
dprintk("i2c read error on %d",reg);

- return (state->i2c_read_buffer[0] << 8) | state->i2c_read_buffer[1];
+ ret = (state->i2c_read_buffer[0] << 8) | state->i2c_read_buffer[1];
+ mutex_unlock(&state->i2c_buffer_lock);
+
+ return ret;
}

static int dib7000m_write_word(struct dib7000m_state *state, u16 reg, u16 val)
{
+ int ret;
+
+ if (mutex_lock_interruptible(&state->i2c_buffer_lock) < 0) {
+ dprintk("could not acquire lock");
+ return -EINVAL;
+ }
+
state->i2c_write_buffer[0] = (reg >> 8) & 0xff;
state->i2c_write_buffer[1] = reg & 0xff;
state->i2c_write_buffer[2] = (val >> 8) & 0xff;
@@ -101,7 +120,10 @@ static int dib7000m_write_word(struct di
state->msg[0].buf = state->i2c_write_buffer;
state->msg[0].len = 4;

- return i2c_transfer(state->i2c_adap, state->msg, 1) != 1 ? -EREMOTEIO : 0;
+ ret = (i2c_transfer(state->i2c_adap, state->msg, 1) != 1 ?
+ -EREMOTEIO : 0);
+ mutex_unlock(&state->i2c_buffer_lock);
+ return ret;
}
static void dib7000m_write_tab(struct dib7000m_state *state, u16 *buf)
{
@@ -1385,6 +1407,7 @@ struct dvb_frontend * dib7000m_attach(st
demod = &st->demod;
demod->demodulator_priv = st;
memcpy(&st->demod.ops, &dib7000m_ops, sizeof(struct dvb_frontend_ops));
+ mutex_init(&st->i2c_buffer_lock);

st->timf_default = cfg->bw->timf;

--- a/drivers/media/dvb/frontends/dib7000p.c
+++ b/drivers/media/dvb/frontends/dib7000p.c
@@ -10,6 +10,7 @@
#include <linux/kernel.h>
#include <linux/slab.h>
#include <linux/i2c.h>
+#include <linux/mutex.h>

#include "dvb_math.h"
#include "dvb_frontend.h"
@@ -68,6 +69,7 @@ struct dib7000p_state {
struct i2c_msg msg[2];
u8 i2c_write_buffer[4];
u8 i2c_read_buffer[2];
+ struct mutex i2c_buffer_lock;
};

enum dib7000p_power_mode {
@@ -81,6 +83,13 @@ static int dib7090_set_diversity_in(stru

static u16 dib7000p_read_word(struct dib7000p_state *state, u16 reg)
{
+ u16 ret;
+
+ if (mutex_lock_interruptible(&state->i2c_buffer_lock) < 0) {
+ dprintk("could not acquire lock");
+ return 0;
+ }
+
state->i2c_write_buffer[0] = reg >> 8;
state->i2c_write_buffer[1] = reg & 0xff;

@@ -97,11 +106,20 @@ static u16 dib7000p_read_word(struct dib
if (i2c_transfer(state->i2c_adap, state->msg, 2) != 2)
dprintk("i2c read error on %d", reg);

- return (state->i2c_read_buffer[0] << 8) | state->i2c_read_buffer[1];
+ ret = (state->i2c_read_buffer[0] << 8) | state->i2c_read_buffer[1];
+ mutex_unlock(&state->i2c_buffer_lock);
+ return ret;
}

static int dib7000p_write_word(struct dib7000p_state *state, u16 reg, u16 val)
{
+ int ret;
+
+ if (mutex_lock_interruptible(&state->i2c_buffer_lock) < 0) {
+ dprintk("could not acquire lock");
+ return -EINVAL;
+ }
+
state->i2c_write_buffer[0] = (reg >> 8) & 0xff;
state->i2c_write_buffer[1] = reg & 0xff;
state->i2c_write_buffer[2] = (val >> 8) & 0xff;
@@ -113,7 +131,10 @@ static int dib7000p_write_word(struct di
state->msg[0].buf = state->i2c_write_buffer;
state->msg[0].len = 4;

- return i2c_transfer(state->i2c_adap, state->msg, 1) != 1 ? -EREMOTEIO : 0;
+ ret = (i2c_transfer(state->i2c_adap, state->msg, 1) != 1 ?
+ -EREMOTEIO : 0);
+ mutex_unlock(&state->i2c_buffer_lock);
+ return ret;
}

static void dib7000p_write_tab(struct dib7000p_state *state, u16 * buf)
@@ -1646,6 +1667,7 @@ int dib7000p_i2c_enumeration(struct i2c_
return -ENOMEM;

dpst->i2c_adap = i2c;
+ mutex_init(&dpst->i2c_buffer_lock);

for (k = no_of_demods - 1; k >= 0; k--) {
dpst->cfg = cfg[k];
@@ -2324,6 +2346,7 @@ struct dvb_frontend *dib7000p_attach(str
demod = &st->demod;
demod->demodulator_priv = st;
memcpy(&st->demod.ops, &dib7000p_ops, sizeof(struct dvb_frontend_ops));
+ mutex_init(&st->i2c_buffer_lock);

dib7000p_write_word(st, 1287, 0x0003); /* sram lead in, rdy */

@@ -2333,8 +2356,9 @@ struct dvb_frontend *dib7000p_attach(str
st->version = dib7000p_read_word(st, 897);

/* FIXME: make sure the dev.parent field is initialized, or else
- request_firmware() will hit an OOPS (this should be moved somewhere
- more common) */
+ request_firmware() will hit an OOPS (this should be moved somewhere
+ more common) */
+ st->i2c_master.gated_tuner_i2c_adap.dev.parent = i2c_adap->dev.parent;

dibx000_init_i2c_master(&st->i2c_master, DIB7000P, st->i2c_adap, st->i2c_addr);

--- a/drivers/media/dvb/frontends/dib8000.c
+++ b/drivers/media/dvb/frontends/dib8000.c
@@ -10,6 +10,8 @@
#include <linux/kernel.h>
#include <linux/slab.h>
#include <linux/i2c.h>
+#include <linux/mutex.h>
+
#include "dvb_math.h"

#include "dvb_frontend.h"
@@ -37,6 +39,7 @@ struct i2c_device {
u8 addr;
u8 *i2c_write_buffer;
u8 *i2c_read_buffer;
+ struct mutex *i2c_buffer_lock;
};

struct dib8000_state {
@@ -77,6 +80,7 @@ struct dib8000_state {
struct i2c_msg msg[2];
u8 i2c_write_buffer[4];
u8 i2c_read_buffer[2];
+ struct mutex i2c_buffer_lock;
};

enum dib8000_power_mode {
@@ -86,24 +90,39 @@ enum dib8000_power_mode {

static u16 dib8000_i2c_read16(struct i2c_device *i2c, u16 reg)
{
+ u16 ret;
struct i2c_msg msg[2] = {
- {.addr = i2c->addr >> 1, .flags = 0,
- .buf = i2c->i2c_write_buffer, .len = 2},
- {.addr = i2c->addr >> 1, .flags = I2C_M_RD,
- .buf = i2c->i2c_read_buffer, .len = 2},
+ {.addr = i2c->addr >> 1, .flags = 0, .len = 2},
+ {.addr = i2c->addr >> 1, .flags = I2C_M_RD, .len = 2},
};

+ if (mutex_lock_interruptible(i2c->i2c_buffer_lock) < 0) {
+ dprintk("could not acquire lock");
+ return 0;
+ }
+
+ msg[0].buf = i2c->i2c_write_buffer;
msg[0].buf[0] = reg >> 8;
msg[0].buf[1] = reg & 0xff;
+ msg[1].buf = i2c->i2c_read_buffer;

if (i2c_transfer(i2c->adap, msg, 2) != 2)
dprintk("i2c read error on %d", reg);

- return (msg[1].buf[0] << 8) | msg[1].buf[1];
+ ret = (msg[1].buf[0] << 8) | msg[1].buf[1];
+ mutex_unlock(i2c->i2c_buffer_lock);
+ return ret;
}

static u16 dib8000_read_word(struct dib8000_state *state, u16 reg)
{
+ u16 ret;
+
+ if (mutex_lock_interruptible(&state->i2c_buffer_lock) < 0) {
+ dprintk("could not acquire lock");
+ return 0;
+ }
+
state->i2c_write_buffer[0] = reg >> 8;
state->i2c_write_buffer[1] = reg & 0xff;

@@ -120,7 +139,10 @@ static u16 dib8000_read_word(struct dib8
if (i2c_transfer(state->i2c.adap, state->msg, 2) != 2)
dprintk("i2c read error on %d", reg);

- return (state->i2c_read_buffer[0] << 8) | state->i2c_read_buffer[1];
+ ret = (state->i2c_read_buffer[0] << 8) | state->i2c_read_buffer[1];
+ mutex_unlock(&state->i2c_buffer_lock);
+
+ return ret;
}

static u32 dib8000_read32(struct dib8000_state *state, u16 reg)
@@ -135,22 +157,35 @@ static u32 dib8000_read32(struct dib8000

static int dib8000_i2c_write16(struct i2c_device *i2c, u16 reg, u16 val)
{
- struct i2c_msg msg = {.addr = i2c->addr >> 1, .flags = 0,
- .buf = i2c->i2c_write_buffer, .len = 4};
+ struct i2c_msg msg = {.addr = i2c->addr >> 1, .flags = 0, .len = 4};
int ret = 0;

+ if (mutex_lock_interruptible(i2c->i2c_buffer_lock) < 0) {
+ dprintk("could not acquire lock");
+ return -EINVAL;
+ }
+
+ msg.buf = i2c->i2c_write_buffer;
msg.buf[0] = (reg >> 8) & 0xff;
msg.buf[1] = reg & 0xff;
msg.buf[2] = (val >> 8) & 0xff;
msg.buf[3] = val & 0xff;

ret = i2c_transfer(i2c->adap, &msg, 1) != 1 ? -EREMOTEIO : 0;
+ mutex_unlock(i2c->i2c_buffer_lock);

return ret;
}

static int dib8000_write_word(struct dib8000_state *state, u16 reg, u16 val)
{
+ int ret;
+
+ if (mutex_lock_interruptible(&state->i2c_buffer_lock) < 0) {
+ dprintk("could not acquire lock");
+ return -EINVAL;
+ }
+
state->i2c_write_buffer[0] = (reg >> 8) & 0xff;
state->i2c_write_buffer[1] = reg & 0xff;
state->i2c_write_buffer[2] = (val >> 8) & 0xff;
@@ -162,7 +197,11 @@ static int dib8000_write_word(struct dib
state->msg[0].buf = state->i2c_write_buffer;
state->msg[0].len = 4;

- return i2c_transfer(state->i2c.adap, state->msg, 1) != 1 ? -EREMOTEIO : 0;
+ ret = (i2c_transfer(state->i2c.adap, state->msg, 1) != 1 ?
+ -EREMOTEIO : 0);
+ mutex_unlock(&state->i2c_buffer_lock);
+
+ return ret;
}

static const s16 coeff_2k_sb_1seg_dqpsk[8] = {
@@ -2434,8 +2473,15 @@ int dib8000_i2c_enumeration(struct i2c_a
if (!client.i2c_read_buffer) {
dprintk("%s: not enough memory", __func__);
ret = -ENOMEM;
- goto error_memory;
+ goto error_memory_read;
+ }
+ client.i2c_buffer_lock = kzalloc(sizeof(struct mutex), GFP_KERNEL);
+ if (!client.i2c_buffer_lock) {
+ dprintk("%s: not enough memory", __func__);
+ ret = -ENOMEM;
+ goto error_memory_lock;
}
+ mutex_init(client.i2c_buffer_lock);

for (k = no_of_demods - 1; k >= 0; k--) {
/* designated i2c address */
@@ -2476,8 +2522,10 @@ int dib8000_i2c_enumeration(struct i2c_a
}

error:
+ kfree(client.i2c_buffer_lock);
+error_memory_lock:
kfree(client.i2c_read_buffer);
-error_memory:
+error_memory_read:
kfree(client.i2c_write_buffer);

return ret;
@@ -2581,6 +2629,8 @@ struct dvb_frontend *dib8000_attach(stru
state->i2c.addr = i2c_addr;
state->i2c.i2c_write_buffer = state->i2c_write_buffer;
state->i2c.i2c_read_buffer = state->i2c_read_buffer;
+ mutex_init(&state->i2c_buffer_lock);
+ state->i2c.i2c_buffer_lock = &state->i2c_buffer_lock;
state->gpio_val = cfg->gpio_val;
state->gpio_dir = cfg->gpio_dir;

--- a/drivers/media/dvb/frontends/dib9000.c
+++ b/drivers/media/dvb/frontends/dib9000.c
@@ -38,6 +38,15 @@ struct i2c_device {
#define DibInitLock(lock) mutex_init(lock)
#define DibFreeLock(lock)

+struct dib9000_pid_ctrl {
+#define DIB9000_PID_FILTER_CTRL 0
+#define DIB9000_PID_FILTER 1
+ u8 cmd;
+ u8 id;
+ u16 pid;
+ u8 onoff;
+};
+
struct dib9000_state {
struct i2c_device i2c;

@@ -99,6 +108,10 @@ struct dib9000_state {
struct i2c_msg msg[2];
u8 i2c_write_buffer[255];
u8 i2c_read_buffer[255];
+ DIB_LOCK demod_lock;
+ u8 get_frontend_internal;
+ struct dib9000_pid_ctrl pid_ctrl[10];
+ s8 pid_ctrl_index; /* -1: empty list; -2: do not use the list */
};

static const u32 fe_info[44] = { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
@@ -1743,19 +1756,56 @@ EXPORT_SYMBOL(dib9000_set_gpio);
int dib9000_fw_pid_filter_ctrl(struct dvb_frontend *fe, u8 onoff)
{
struct dib9000_state *state = fe->demodulator_priv;
- u16 val = dib9000_read_word(state, 294 + 1) & 0xffef;
+ u16 val;
+ int ret;
+
+ if ((state->pid_ctrl_index != -2) && (state->pid_ctrl_index < 9)) {
+ /* postpone the pid filtering cmd */
+ dprintk("pid filter cmd postpone");
+ state->pid_ctrl_index++;
+ state->pid_ctrl[state->pid_ctrl_index].cmd = DIB9000_PID_FILTER_CTRL;
+ state->pid_ctrl[state->pid_ctrl_index].onoff = onoff;
+ return 0;
+ }
+
+ DibAcquireLock(&state->demod_lock);
+
+ val = dib9000_read_word(state, 294 + 1) & 0xffef;
val |= (onoff & 0x1) << 4;

dprintk("PID filter enabled %d", onoff);
- return dib9000_write_word(state, 294 + 1, val);
+ ret = dib9000_write_word(state, 294 + 1, val);
+ DibReleaseLock(&state->demod_lock);
+ return ret;
+
}
EXPORT_SYMBOL(dib9000_fw_pid_filter_ctrl);

int dib9000_fw_pid_filter(struct dvb_frontend *fe, u8 id, u16 pid, u8 onoff)
{
struct dib9000_state *state = fe->demodulator_priv;
+ int ret;
+
+ if (state->pid_ctrl_index != -2) {
+ /* postpone the pid filtering cmd */
+ dprintk("pid filter postpone");
+ if (state->pid_ctrl_index < 9) {
+ state->pid_ctrl_index++;
+ state->pid_ctrl[state->pid_ctrl_index].cmd = DIB9000_PID_FILTER;
+ state->pid_ctrl[state->pid_ctrl_index].id = id;
+ state->pid_ctrl[state->pid_ctrl_index].pid = pid;
+ state->pid_ctrl[state->pid_ctrl_index].onoff = onoff;
+ } else
+ dprintk("can not add any more pid ctrl cmd");
+ return 0;
+ }
+
+ DibAcquireLock(&state->demod_lock);
dprintk("Index %x, PID %d, OnOff %d", id, pid, onoff);
- return dib9000_write_word(state, 300 + 1 + id, onoff ? (1 << 13) | pid : 0);
+ ret = dib9000_write_word(state, 300 + 1 + id,
+ onoff ? (1 << 13) | pid : 0);
+ DibReleaseLock(&state->demod_lock);
+ return ret;
}
EXPORT_SYMBOL(dib9000_fw_pid_filter);

@@ -1778,6 +1828,7 @@ static void dib9000_release(struct dvb_f
DibFreeLock(&state->platform.risc.mbx_lock);
DibFreeLock(&state->platform.risc.mem_lock);
DibFreeLock(&state->platform.risc.mem_mbx_lock);
+ DibFreeLock(&state->demod_lock);
dibx000_exit_i2c_master(&st->i2c_master);

i2c_del_adapter(&st->tuner_adap);
@@ -1795,14 +1846,19 @@ static int dib9000_sleep(struct dvb_fron
{
struct dib9000_state *state = fe->demodulator_priv;
u8 index_frontend;
- int ret;
+ int ret = 0;

+ DibAcquireLock(&state->demod_lock);
for (index_frontend = 1; (index_frontend < MAX_NUMBER_OF_FRONTENDS) && (state->fe[index_frontend] != NULL); index_frontend++) {
ret = state->fe[index_frontend]->ops.sleep(state->fe[index_frontend]);
if (ret < 0)
- return ret;
+ goto error;
}
- return dib9000_mbx_send(state, OUT_MSG_FE_SLEEP, NULL, 0);
+ ret = dib9000_mbx_send(state, OUT_MSG_FE_SLEEP, NULL, 0);
+
+error:
+ DibReleaseLock(&state->demod_lock);
+ return ret;
}

static int dib9000_fe_get_tune_settings(struct dvb_frontend *fe, struct dvb_frontend_tune_settings *tune)
@@ -1816,7 +1872,10 @@ static int dib9000_get_frontend(struct d
struct dib9000_state *state = fe->demodulator_priv;
u8 index_frontend, sub_index_frontend;
fe_status_t stat;
- int ret;
+ int ret = 0;
+
+ if (state->get_frontend_internal == 0)
+ DibAcquireLock(&state->demod_lock);

for (index_frontend = 1; (index_frontend < MAX_NUMBER_OF_FRONTENDS) && (state->fe[index_frontend] != NULL); index_frontend++) {
state->fe[index_frontend]->ops.read_status(state->fe[index_frontend], &stat);
@@ -1846,14 +1905,15 @@ static int dib9000_get_frontend(struct d
state->fe[index_frontend]->dtv_property_cache.rolloff;
}
}
- return 0;
+ ret = 0;
+ goto return_value;
}
}

/* get the channel from master chip */
ret = dib9000_fw_get_channel(fe, fep);
if (ret != 0)
- return ret;
+ goto return_value;

/* synchronize the cache with the other frontends */
for (index_frontend = 1; (index_frontend < MAX_NUMBER_OF_FRONTENDS) && (state->fe[index_frontend] != NULL); index_frontend++) {
@@ -1866,8 +1926,12 @@ static int dib9000_get_frontend(struct d
state->fe[index_frontend]->dtv_property_cache.code_rate_LP = fe->dtv_property_cache.code_rate_LP;
state->fe[index_frontend]->dtv_property_cache.rolloff = fe->dtv_property_cache.rolloff;
}
+ ret = 0;

- return 0;
+return_value:
+ if (state->get_frontend_internal == 0)
+ DibReleaseLock(&state->demod_lock);
+ return ret;
}

static int dib9000_set_tune_state(struct dvb_frontend *fe, enum frontend_tune_state tune_state)
@@ -1912,6 +1976,10 @@ static int dib9000_set_frontend(struct d
dprintk("dib9000: must specify bandwidth ");
return 0;
}
+
+ state->pid_ctrl_index = -1; /* postpone the pid filtering cmd */
+ DibAcquireLock(&state->demod_lock);
+
fe->dtv_property_cache.delivery_system = SYS_DVBT;

/* set the master status */
@@ -1974,13 +2042,18 @@ static int dib9000_set_frontend(struct d
/* check the tune result */
if (exit_condition == 1) { /* tune failed */
dprintk("tune failed");
+ DibReleaseLock(&state->demod_lock);
+ /* tune failed; put all the pid filtering cmd to junk */
+ state->pid_ctrl_index = -1;
return 0;
}

dprintk("tune success on frontend%i", index_frontend_success);

/* synchronize all the channel cache */
+ state->get_frontend_internal = 1;
dib9000_get_frontend(state->fe[0], fep);
+ state->get_frontend_internal = 0;

/* retune the other frontends with the found channel */
channel_status.status = CHANNEL_STATUS_PARAMETERS_SET;
@@ -2025,6 +2098,28 @@ static int dib9000_set_frontend(struct d
/* turn off the diversity for the last frontend */
dib9000_fw_set_diversity_in(state->fe[index_frontend - 1], 0);

+ DibReleaseLock(&state->demod_lock);
+ if (state->pid_ctrl_index >= 0) {
+ u8 index_pid_filter_cmd;
+ u8 pid_ctrl_index = state->pid_ctrl_index;
+
+ state->pid_ctrl_index = -2;
+ for (index_pid_filter_cmd = 0;
+ index_pid_filter_cmd <= pid_ctrl_index;
+ index_pid_filter_cmd++) {
+ if (state->pid_ctrl[index_pid_filter_cmd].cmd == DIB9000_PID_FILTER_CTRL)
+ dib9000_fw_pid_filter_ctrl(state->fe[0],
+ state->pid_ctrl[index_pid_filter_cmd].onoff);
+ else if (state->pid_ctrl[index_pid_filter_cmd].cmd == DIB9000_PID_FILTER)
+ dib9000_fw_pid_filter(state->fe[0],
+ state->pid_ctrl[index_pid_filter_cmd].id,
+ state->pid_ctrl[index_pid_filter_cmd].pid,
+ state->pid_ctrl[index_pid_filter_cmd].onoff);
+ }
+ }
+ /* do not postpone any more the pid filtering */
+ state->pid_ctrl_index = -2;
+
return 0;
}

@@ -2041,6 +2136,7 @@ static int dib9000_read_status(struct dv
u8 index_frontend;
u16 lock = 0, lock_slave = 0;

+ DibAcquireLock(&state->demod_lock);
for (index_frontend = 1; (index_frontend < MAX_NUMBER_OF_FRONTENDS) && (state->fe[index_frontend] != NULL); index_frontend++)
lock_slave |= dib9000_read_lock(state->fe[index_frontend]);

@@ -2059,6 +2155,8 @@ static int dib9000_read_status(struct dv
if ((lock & 0x0008) || (lock_slave & 0x0008))
*stat |= FE_HAS_LOCK;

+ DibReleaseLock(&state->demod_lock);
+
return 0;
}

@@ -2066,10 +2164,14 @@ static int dib9000_read_ber(struct dvb_f
{
struct dib9000_state *state = fe->demodulator_priv;
u16 *c;
+ int ret = 0;

+ DibAcquireLock(&state->demod_lock);
DibAcquireLock(&state->platform.risc.mem_mbx_lock);
- if (dib9000_fw_memmbx_sync(state, FE_SYNC_CHANNEL) < 0)
- return -EIO;
+ if (dib9000_fw_memmbx_sync(state, FE_SYNC_CHANNEL) < 0) {
+ ret = -EIO;
+ goto error;
+ }
dib9000_risc_mem_read(state, FE_MM_R_FE_MONITOR,
state->i2c_read_buffer, 16 * 2);
DibReleaseLock(&state->platform.risc.mem_mbx_lock);
@@ -2077,7 +2179,10 @@ static int dib9000_read_ber(struct dvb_f
c = (u16 *)state->i2c_read_buffer;

*ber = c[10] << 16 | c[11];
- return 0;
+
+error:
+ DibReleaseLock(&state->demod_lock);
+ return ret;
}

static int dib9000_read_signal_strength(struct dvb_frontend *fe, u16 * strength)
@@ -2086,7 +2191,9 @@ static int dib9000_read_signal_strength(
u8 index_frontend;
u16 *c = (u16 *)state->i2c_read_buffer;
u16 val;
+ int ret = 0;

+ DibAcquireLock(&state->demod_lock);
*strength = 0;
for (index_frontend = 1; (index_frontend < MAX_NUMBER_OF_FRONTENDS) && (state->fe[index_frontend] != NULL); index_frontend++) {
state->fe[index_frontend]->ops.read_signal_strength(state->fe[index_frontend], &val);
@@ -2097,8 +2204,10 @@ static int dib9000_read_signal_strength(
}

DibAcquireLock(&state->platform.risc.mem_mbx_lock);
- if (dib9000_fw_memmbx_sync(state, FE_SYNC_CHANNEL) < 0)
- return -EIO;
+ if (dib9000_fw_memmbx_sync(state, FE_SYNC_CHANNEL) < 0) {
+ ret = -EIO;
+ goto error;
+ }
dib9000_risc_mem_read(state, FE_MM_R_FE_MONITOR, (u8 *) c, 16 * 2);
DibReleaseLock(&state->platform.risc.mem_mbx_lock);

@@ -2107,7 +2216,10 @@ static int dib9000_read_signal_strength(
*strength = 65535;
else
*strength += val;
- return 0;
+
+error:
+ DibReleaseLock(&state->demod_lock);
+ return ret;
}

static u32 dib9000_get_snr(struct dvb_frontend *fe)
@@ -2151,6 +2263,7 @@ static int dib9000_read_snr(struct dvb_f
u8 index_frontend;
u32 snr_master;

+ DibAcquireLock(&state->demod_lock);
snr_master = dib9000_get_snr(fe);
for (index_frontend = 1; (index_frontend < MAX_NUMBER_OF_FRONTENDS) && (state->fe[index_frontend] != NULL); index_frontend++)
snr_master += dib9000_get_snr(state->fe[index_frontend]);
@@ -2161,6 +2274,8 @@ static int dib9000_read_snr(struct dvb_f
} else
*snr = 0;

+ DibReleaseLock(&state->demod_lock);
+
return 0;
}

@@ -2168,15 +2283,22 @@ static int dib9000_read_unc_blocks(struc
{
struct dib9000_state *state = fe->demodulator_priv;
u16 *c = (u16 *)state->i2c_read_buffer;
+ int ret = 0;

+ DibAcquireLock(&state->demod_lock);
DibAcquireLock(&state->platform.risc.mem_mbx_lock);
- if (dib9000_fw_memmbx_sync(state, FE_SYNC_CHANNEL) < 0)
- return -EIO;
+ if (dib9000_fw_memmbx_sync(state, FE_SYNC_CHANNEL) < 0) {
+ ret = -EIO;
+ goto error;
+ }
dib9000_risc_mem_read(state, FE_MM_R_FE_MONITOR, (u8 *) c, 16 * 2);
DibReleaseLock(&state->platform.risc.mem_mbx_lock);

*unc = c[12];
- return 0;
+
+error:
+ DibReleaseLock(&state->demod_lock);
+ return ret;
}

int dib9000_i2c_enumeration(struct i2c_adapter *i2c, int no_of_demods, u8 default_addr, u8 first_addr)
@@ -2322,6 +2444,10 @@ struct dvb_frontend *dib9000_attach(stru
DibInitLock(&st->platform.risc.mbx_lock);
DibInitLock(&st->platform.risc.mem_lock);
DibInitLock(&st->platform.risc.mem_mbx_lock);
+ DibInitLock(&st->demod_lock);
+ st->get_frontend_internal = 0;
+
+ st->pid_ctrl_index = -2;

st->fe[0] = fe;
fe->demodulator_priv = st;
--- a/drivers/media/dvb/frontends/dibx000_common.c
+++ b/drivers/media/dvb/frontends/dibx000_common.c
@@ -1,4 +1,5 @@
#include <linux/i2c.h>
+#include <linux/mutex.h>

#include "dibx000_common.h"

@@ -10,6 +11,13 @@ MODULE_PARM_DESC(debug, "turn on debuggi

static int dibx000_write_word(struct dibx000_i2c_master *mst, u16 reg, u16 val)
{
+ int ret;
+
+ if (mutex_lock_interruptible(&mst->i2c_buffer_lock) < 0) {
+ dprintk("could not acquire lock");
+ return -EINVAL;
+ }
+
mst->i2c_write_buffer[0] = (reg >> 8) & 0xff;
mst->i2c_write_buffer[1] = reg & 0xff;
mst->i2c_write_buffer[2] = (val >> 8) & 0xff;
@@ -21,11 +29,21 @@ static int dibx000_write_word(struct dib
mst->msg[0].buf = mst->i2c_write_buffer;
mst->msg[0].len = 4;

- return i2c_transfer(mst->i2c_adap, mst->msg, 1) != 1 ? -EREMOTEIO : 0;
+ ret = i2c_transfer(mst->i2c_adap, mst->msg, 1) != 1 ? -EREMOTEIO : 0;
+ mutex_unlock(&mst->i2c_buffer_lock);
+
+ return ret;
}

static u16 dibx000_read_word(struct dibx000_i2c_master *mst, u16 reg)
{
+ u16 ret;
+
+ if (mutex_lock_interruptible(&mst->i2c_buffer_lock) < 0) {
+ dprintk("could not acquire lock");
+ return 0;
+ }
+
mst->i2c_write_buffer[0] = reg >> 8;
mst->i2c_write_buffer[1] = reg & 0xff;

@@ -42,7 +60,10 @@ static u16 dibx000_read_word(struct dibx
if (i2c_transfer(mst->i2c_adap, mst->msg, 2) != 2)
dprintk("i2c read error on %d", reg);

- return (mst->i2c_read_buffer[0] << 8) | mst->i2c_read_buffer[1];
+ ret = (mst->i2c_read_buffer[0] << 8) | mst->i2c_read_buffer[1];
+ mutex_unlock(&mst->i2c_buffer_lock);
+
+ return ret;
}

static int dibx000_is_i2c_done(struct dibx000_i2c_master *mst)
@@ -257,6 +278,7 @@ static int dibx000_i2c_gated_gpio67_xfer
struct i2c_msg msg[], int num)
{
struct dibx000_i2c_master *mst = i2c_get_adapdata(i2c_adap);
+ int ret;

if (num > 32) {
dprintk("%s: too much I2C message to be transmitted (%i).\
@@ -264,10 +286,15 @@ static int dibx000_i2c_gated_gpio67_xfer
return -ENOMEM;
}

- memset(mst->msg, 0, sizeof(struct i2c_msg) * (2 + num));
-
dibx000_i2c_select_interface(mst, DIBX000_I2C_INTERFACE_GPIO_6_7);

+ if (mutex_lock_interruptible(&mst->i2c_buffer_lock) < 0) {
+ dprintk("could not acquire lock");
+ return -EINVAL;
+ }
+
+ memset(mst->msg, 0, sizeof(struct i2c_msg) * (2 + num));
+
/* open the gate */
dibx000_i2c_gate_ctrl(mst, &mst->i2c_write_buffer[0], msg[0].addr, 1);
mst->msg[0].addr = mst->i2c_addr;
@@ -282,7 +309,11 @@ static int dibx000_i2c_gated_gpio67_xfer
mst->msg[num + 1].buf = &mst->i2c_write_buffer[4];
mst->msg[num + 1].len = 4;

- return i2c_transfer(mst->i2c_adap, mst->msg, 2 + num) == 2 + num ? num : -EIO;
+ ret = (i2c_transfer(mst->i2c_adap, mst->msg, 2 + num) == 2 + num ?
+ num : -EIO);
+
+ mutex_unlock(&mst->i2c_buffer_lock);
+ return ret;
}

static struct i2c_algorithm dibx000_i2c_gated_gpio67_algo = {
@@ -294,6 +325,7 @@ static int dibx000_i2c_gated_tuner_xfer(
struct i2c_msg msg[], int num)
{
struct dibx000_i2c_master *mst = i2c_get_adapdata(i2c_adap);
+ int ret;

if (num > 32) {
dprintk("%s: too much I2C message to be transmitted (%i).\
@@ -301,10 +333,14 @@ static int dibx000_i2c_gated_tuner_xfer(
return -ENOMEM;
}

- memset(mst->msg, 0, sizeof(struct i2c_msg) * (2 + num));
-
dibx000_i2c_select_interface(mst, DIBX000_I2C_INTERFACE_TUNER);

+ if (mutex_lock_interruptible(&mst->i2c_buffer_lock) < 0) {
+ dprintk("could not acquire lock");
+ return -EINVAL;
+ }
+ memset(mst->msg, 0, sizeof(struct i2c_msg) * (2 + num));
+
/* open the gate */
dibx000_i2c_gate_ctrl(mst, &mst->i2c_write_buffer[0], msg[0].addr, 1);
mst->msg[0].addr = mst->i2c_addr;
@@ -319,7 +355,10 @@ static int dibx000_i2c_gated_tuner_xfer(
mst->msg[num + 1].buf = &mst->i2c_write_buffer[4];
mst->msg[num + 1].len = 4;

- return i2c_transfer(mst->i2c_adap, mst->msg, 2 + num) == 2 + num ? num : -EIO;
+ ret = (i2c_transfer(mst->i2c_adap, mst->msg, 2 + num) == 2 + num ?
+ num : -EIO);
+ mutex_unlock(&mst->i2c_buffer_lock);
+ return ret;
}

static struct i2c_algorithm dibx000_i2c_gated_tuner_algo = {
@@ -390,8 +429,18 @@ static int i2c_adapter_init(struct i2c_a
int dibx000_init_i2c_master(struct dibx000_i2c_master *mst, u16 device_rev,
struct i2c_adapter *i2c_adap, u8 i2c_addr)
{
- u8 tx[4];
- struct i2c_msg m = {.addr = i2c_addr >> 1,.buf = tx,.len = 4 };
+ int ret;
+
+ mutex_init(&mst->i2c_buffer_lock);
+ if (mutex_lock_interruptible(&mst->i2c_buffer_lock) < 0) {
+ dprintk("could not acquire lock");
+ return -EINVAL;
+ }
+ memset(mst->msg, 0, sizeof(struct i2c_msg));
+ mst->msg[0].addr = i2c_addr >> 1;
+ mst->msg[0].flags = 0;
+ mst->msg[0].buf = mst->i2c_write_buffer;
+ mst->msg[0].len = 4;

mst->device_rev = device_rev;
mst->i2c_adap = i2c_adap;
@@ -431,9 +480,12 @@ int dibx000_init_i2c_master(struct dibx0
"DiBX000: could not initialize the master i2c_adapter\n");

/* initialize the i2c-master by closing the gate */
- dibx000_i2c_gate_ctrl(mst, tx, 0, 0);
+ dibx000_i2c_gate_ctrl(mst, mst->i2c_write_buffer, 0, 0);
+
+ ret = (i2c_transfer(i2c_adap, mst->msg, 1) == 1);
+ mutex_unlock(&mst->i2c_buffer_lock);

- return i2c_transfer(i2c_adap, &m, 1) == 1;
+ return ret;
}

EXPORT_SYMBOL(dibx000_init_i2c_master);
--- a/drivers/media/dvb/frontends/dibx000_common.h
+++ b/drivers/media/dvb/frontends/dibx000_common.h
@@ -33,6 +33,7 @@ struct dibx000_i2c_master {
struct i2c_msg msg[34];
u8 i2c_write_buffer[8];
u8 i2c_read_buffer[2];
+ struct mutex i2c_buffer_lock;
};

extern int dibx000_init_i2c_master(struct dibx000_i2c_master *mst,



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