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Subject[PATCH 2/4] firedtv: reform lock transaction backend call
Preparation for the port of firedtv to the firewire-core kernel API:
The fdtv->backend->lock() hook and thus the CMP code is slightly changed
to better fit with the new API.

Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de>
---
drivers/media/dvb/firewire/firedtv-1394.c | 11 ++++-
drivers/media/dvb/firewire/firedtv-avc.c | 50 ++++++++++++----------
drivers/media/dvb/firewire/firedtv.h | 2
3 files changed, 37 insertions(+), 26 deletions(-)
Index: linux-2.6.31.4/drivers/media/dvb/firewire/firedtv-1394.c
===================================================================
--- linux-2.6.31.4.orig/drivers/media/dvb/firewire/firedtv-1394.c
+++ linux-2.6.31.4/drivers/media/dvb/firewire/firedtv-1394.c
@@ -87,10 +87,15 @@ static inline struct node_entry *node_of
return container_of(fdtv->device, struct unit_directory, device)->ne;
}

-static int node_lock(struct firedtv *fdtv, u64 addr, void *data, __be32 arg)
+static int node_lock(struct firedtv *fdtv, u64 addr, __be32 data[])
{
- return hpsb_node_lock(node_of(fdtv), addr, EXTCODE_COMPARE_SWAP, data,
- (__force quadlet_t)arg);
+ int ret;
+
+ ret = hpsb_node_lock(node_of(fdtv), addr, EXTCODE_COMPARE_SWAP,
+ (__force quadlet_t *)&data[1], (__force quadlet_t)data[0]);
+ data[0] = data[1];
+
+ return ret;
}

static int node_read(struct firedtv *fdtv, u64 addr, void *data, size_t len)
Index: linux-2.6.31.4/drivers/media/dvb/firewire/firedtv-avc.c
===================================================================
--- linux-2.6.31.4.orig/drivers/media/dvb/firewire/firedtv-avc.c
+++ linux-2.6.31.4/drivers/media/dvb/firewire/firedtv-avc.c
@@ -1255,14 +1255,14 @@ static int cmp_read(struct firedtv *fdtv
return ret;
}

-static int cmp_lock(struct firedtv *fdtv, void *data, u64 addr, __be32 arg)
+static int cmp_lock(struct firedtv *fdtv, u64 addr, __be32 data[])
{
int ret;

if (mutex_lock_interruptible(&fdtv->avc_mutex))
return -EINTR;

- ret = fdtv->backend->lock(fdtv, addr, data, arg);
+ ret = fdtv->backend->lock(fdtv, addr, data);
if (ret < 0)
dev_err(fdtv->device, "CMP: lock I/O error\n");

@@ -1292,25 +1292,25 @@ static inline void set_opcr(__be32 *opcr

int cmp_establish_pp_connection(struct firedtv *fdtv, int plug, int channel)
{
- __be32 old_opcr, opcr;
+ __be32 old_opcr, opcr[2];
u64 opcr_address = CMP_OUTPUT_PLUG_CONTROL_REG_0 + (plug << 2);
int attempts = 0;
int ret;

- ret = cmp_read(fdtv, &opcr, opcr_address, 4);
+ ret = cmp_read(fdtv, opcr, opcr_address, 4);
if (ret < 0)
return ret;

repeat:
- if (!get_opcr_online(opcr)) {
+ if (!get_opcr_online(*opcr)) {
dev_err(fdtv->device, "CMP: output offline\n");
return -EBUSY;
}

- old_opcr = opcr;
+ old_opcr = *opcr;

- if (get_opcr_p2p_connections(opcr)) {
- if (get_opcr_channel(opcr) != channel) {
+ if (get_opcr_p2p_connections(*opcr)) {
+ if (get_opcr_channel(*opcr) != channel) {
dev_err(fdtv->device, "CMP: cannot change channel\n");
return -EBUSY;
}
@@ -1318,11 +1318,11 @@ repeat:

/* We don't allocate isochronous resources. */
} else {
- set_opcr_channel(&opcr, channel);
- set_opcr_data_rate(&opcr, 2); /* S400 */
+ set_opcr_channel(opcr, channel);
+ set_opcr_data_rate(opcr, 2); /* S400 */

/* FIXME: this is for the worst case - optimize */
- set_opcr_overhead_id(&opcr, 0);
+ set_opcr_overhead_id(opcr, 0);

/*
* FIXME: allocate isochronous channel and bandwidth at IRM
@@ -1330,13 +1330,16 @@ repeat:
*/
}

- set_opcr_p2p_connections(&opcr, get_opcr_p2p_connections(opcr) + 1);
+ set_opcr_p2p_connections(opcr, get_opcr_p2p_connections(*opcr) + 1);

- ret = cmp_lock(fdtv, &opcr, opcr_address, old_opcr);
+ opcr[1] = *opcr;
+ opcr[0] = old_opcr;
+
+ ret = cmp_lock(fdtv, opcr_address, opcr);
if (ret < 0)
return ret;

- if (old_opcr != opcr) {
+ if (old_opcr != *opcr) {
/*
* FIXME: if old_opcr.P2P_Connections > 0,
* deallocate isochronous channel and bandwidth at IRM
@@ -1354,27 +1357,30 @@ repeat:

void cmp_break_pp_connection(struct firedtv *fdtv, int plug, int channel)
{
- __be32 old_opcr, opcr;
+ __be32 old_opcr, opcr[2];
u64 opcr_address = CMP_OUTPUT_PLUG_CONTROL_REG_0 + (plug << 2);
int attempts = 0;

- if (cmp_read(fdtv, &opcr, opcr_address, 4) < 0)
+ if (cmp_read(fdtv, opcr, opcr_address, 4) < 0)
return;

repeat:
- if (!get_opcr_online(opcr) || !get_opcr_p2p_connections(opcr) ||
- get_opcr_channel(opcr) != channel) {
+ if (!get_opcr_online(*opcr) || !get_opcr_p2p_connections(*opcr) ||
+ get_opcr_channel(*opcr) != channel) {
dev_err(fdtv->device, "CMP: no connection to break\n");
return;
}

- old_opcr = opcr;
- set_opcr_p2p_connections(&opcr, get_opcr_p2p_connections(opcr) - 1);
+ old_opcr = *opcr;
+ set_opcr_p2p_connections(opcr, get_opcr_p2p_connections(*opcr) - 1);
+
+ opcr[1] = *opcr;
+ opcr[0] = old_opcr;

- if (cmp_lock(fdtv, &opcr, opcr_address, old_opcr) < 0)
+ if (cmp_lock(fdtv, opcr_address, opcr) < 0)
return;

- if (old_opcr != opcr) {
+ if (old_opcr != *opcr) {
/*
* FIXME: if old_opcr.P2P_Connections == 1, i.e. we were last
* owner, deallocate isochronous channel and bandwidth at IRM
Index: linux-2.6.31.4/drivers/media/dvb/firewire/firedtv.h
===================================================================
--- linux-2.6.31.4.orig/drivers/media/dvb/firewire/firedtv.h
+++ linux-2.6.31.4/drivers/media/dvb/firewire/firedtv.h
@@ -72,7 +72,7 @@ struct input_dev;
struct firedtv;

struct firedtv_backend {
- int (*lock)(struct firedtv *fdtv, u64 addr, void *data, __be32 arg);
+ int (*lock)(struct firedtv *fdtv, u64 addr, __be32 data[]);
int (*read)(struct firedtv *fdtv, u64 addr, void *data, size_t len);
int (*write)(struct firedtv *fdtv, u64 addr, void *data, size_t len);
int (*start_iso)(struct firedtv *fdtv);
--
Stefan Richter
-=====-==--= =-== -=---
http://arcgraph.de/sr/


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