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Subject[patch-mm 1/6] DVB (2401): USB hot unplug Oops fix.
From: Deti Fliegl <deti@fliegl.de>

- USB hot unplug Oops fix.

Signed-off-by: Deti Fliegl <deti@fliegl.de>
Signed-off-by: Johannes Stezenbach <js@linuxtv.org>
Signed-off-by: Mauro Carvalho Chehab <mchehab@brturbo.com.br>

---
drivers/media/dvb/cinergyT2/cinergyT2.c | 71 +++++++++++++++++++++-----------
1 file changed, 47 insertions(+), 24 deletions(-)
--- linux-2.6.15-rc5.orig/drivers/media/dvb/cinergyT2/cinergyT2.c 2005-12-11 01:09:39.000000000 +0100
+++ linux-2.6.15-rc5/drivers/media/dvb/cinergyT2/cinergyT2.c 2005-12-11 01:18:06.000000000 +0100
@@ -131,6 +131,8 @@ struct cinergyt2 {

wait_queue_head_t poll_wq;
int pending_fe_events;
+ int disconnect_pending;
+ atomic_t inuse;

void *streambuf;
dma_addr_t streambuf_dmahandle;
@@ -343,7 +345,7 @@ static int cinergyt2_start_feed(struct d
struct dvb_demux *demux = dvbdmxfeed->demux;
struct cinergyt2 *cinergyt2 = demux->priv;

- if (down_interruptible(&cinergyt2->sem))
+ if (cinergyt2->disconnect_pending || down_interruptible(&cinergyt2->sem))
return -ERESTARTSYS;

if (cinergyt2->streaming == 0)
@@ -359,7 +361,7 @@ static int cinergyt2_stop_feed(struct dv
struct dvb_demux *demux = dvbdmxfeed->demux;
struct cinergyt2 *cinergyt2 = demux->priv;

- if (down_interruptible(&cinergyt2->sem))
+ if (cinergyt2->disconnect_pending || down_interruptible(&cinergyt2->sem))
return -ERESTARTSYS;

if (--cinergyt2->streaming == 0)
@@ -479,23 +481,37 @@ static int cinergyt2_open (struct inode
{
struct dvb_device *dvbdev = file->private_data;
struct cinergyt2 *cinergyt2 = dvbdev->priv;
- int err;
+ int err = -ERESTARTSYS;

- if ((err = dvb_generic_open(inode, file)))
+ if (cinergyt2->disconnect_pending || down_interruptible(&cinergyt2->sem))
+ return -ERESTARTSYS;
+
+ if ((err = dvb_generic_open(inode, file))) {
+ up(&cinergyt2->sem);
return err;
+ }

- if (down_interruptible(&cinergyt2->sem))
- return -ERESTARTSYS;

if ((file->f_flags & O_ACCMODE) != O_RDONLY) {
cinergyt2_sleep(cinergyt2, 0);
schedule_delayed_work(&cinergyt2->query_work, HZ/2);
}

+ atomic_inc(&cinergyt2->inuse);
+
up(&cinergyt2->sem);
return 0;
}

+static void cinergyt2_unregister(struct cinergyt2 *cinergyt2)
+{
+ dvb_unregister_device(cinergyt2->fedev);
+ dvb_unregister_adapter(&cinergyt2->adapter);
+
+ cinergyt2_free_stream_urbs(cinergyt2);
+ kfree(cinergyt2);
+}
+
static int cinergyt2_release (struct inode *inode, struct file *file)
{
struct dvb_device *dvbdev = file->private_data;
@@ -504,7 +520,7 @@ static int cinergyt2_release (struct ino
if (down_interruptible(&cinergyt2->sem))
return -ERESTARTSYS;

- if ((file->f_flags & O_ACCMODE) != O_RDONLY) {
+ if (!cinergyt2->disconnect_pending && (file->f_flags & O_ACCMODE) != O_RDONLY) {
cancel_delayed_work(&cinergyt2->query_work);
flush_scheduled_work();
cinergyt2_sleep(cinergyt2, 1);
@@ -512,6 +528,11 @@ static int cinergyt2_release (struct ino

up(&cinergyt2->sem);

+ if (atomic_dec_and_test(&cinergyt2->inuse) && cinergyt2->disconnect_pending) {
+ warn("delayed unregister in release");
+ cinergyt2_unregister(cinergyt2);
+ }
+
return dvb_generic_release(inode, file);
}

@@ -519,7 +540,14 @@ static unsigned int cinergyt2_poll (stru
{
struct dvb_device *dvbdev = file->private_data;
struct cinergyt2 *cinergyt2 = dvbdev->priv;
+
+ if (cinergyt2->disconnect_pending || down_interruptible(&cinergyt2->sem))
+ return -ERESTARTSYS;
+
poll_wait(file, &cinergyt2->poll_wq, wait);
+
+ up(&cinergyt2->sem);
+
return (POLLIN | POLLRDNORM | POLLPRI);
}

@@ -585,7 +613,7 @@ static int cinergyt2_ioctl (struct inode
if (copy_from_user(&p, (void __user*) arg, sizeof(p)))
return -EFAULT;

- if (down_interruptible(&cinergyt2->sem))
+ if (cinergyt2->disconnect_pending || down_interruptible(&cinergyt2->sem))
return -ERESTARTSYS;

param->cmd = CINERGYT2_EP1_SET_TUNER_PARAMETERS;
@@ -696,7 +724,7 @@ static void cinergyt2_query_rc (void *da
struct cinergyt2_rc_event rc_events[12];
int n, len, i;

- if (down_interruptible(&cinergyt2->sem))
+ if (cinergyt2->disconnect_pending || down_interruptible(&cinergyt2->sem))
return;

len = cinergyt2_command(cinergyt2, buf, sizeof(buf),
@@ -791,7 +819,6 @@ static int cinergyt2_register_rc(struct
static void cinergyt2_unregister_rc(struct cinergyt2 *cinergyt2)
{
cancel_delayed_work(&cinergyt2->rc_query_work);
- flush_scheduled_work();
input_unregister_device(cinergyt2->rc_input_dev);
}

@@ -822,7 +849,7 @@ static void cinergyt2_query (void *data)
uint8_t lock_bits;
uint32_t unc;

- if (down_interruptible(&cinergyt2->sem))
+ if (cinergyt2->disconnect_pending || down_interruptible(&cinergyt2->sem))
return;

unc = s->uncorrected_block_count;
@@ -922,28 +949,25 @@ static void cinergyt2_disconnect (struct
{
struct cinergyt2 *cinergyt2 = usb_get_intfdata (intf);

- if (down_interruptible(&cinergyt2->sem))
- return;
+ flush_scheduled_work();

cinergyt2_unregister_rc(cinergyt2);

+ cancel_delayed_work(&cinergyt2->query_work);
+ wake_up_interruptible(&cinergyt2->poll_wq);
+
cinergyt2->demux.dmx.close(&cinergyt2->demux.dmx);
- dvb_net_release(&cinergyt2->dvbnet);
- dvb_dmxdev_release(&cinergyt2->dmxdev);
- dvb_dmx_release(&cinergyt2->demux);
- dvb_unregister_device(cinergyt2->fedev);
- dvb_unregister_adapter(&cinergyt2->adapter);
+ cinergyt2->disconnect_pending = 1;

- cinergyt2_free_stream_urbs(cinergyt2);
- up(&cinergyt2->sem);
- kfree(cinergyt2);
+ if (!atomic_read(&cinergyt2->inuse))
+ cinergyt2_unregister(cinergyt2);
}

static int cinergyt2_suspend (struct usb_interface *intf, pm_message_t state)
{
struct cinergyt2 *cinergyt2 = usb_get_intfdata (intf);

- if (down_interruptible(&cinergyt2->sem))
+ if (cinergyt2->disconnect_pending || down_interruptible(&cinergyt2->sem))
return -ERESTARTSYS;

if (state.event > PM_EVENT_ON) {
@@ -966,7 +990,7 @@ static int cinergyt2_resume (struct usb_
struct cinergyt2 *cinergyt2 = usb_get_intfdata (intf);
struct dvbt_set_parameters_msg *param = &cinergyt2->param;

- if (down_interruptible(&cinergyt2->sem))
+ if (cinergyt2->disconnect_pending || down_interruptible(&cinergyt2->sem))
return -ERESTARTSYS;

if (!cinergyt2->sleeping) {
@@ -1020,4 +1044,3 @@ module_exit (cinergyt2_exit);

MODULE_LICENSE("GPL");
MODULE_AUTHOR("Holger Waechtler, Daniel Mack");
-
--

-
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