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Subject[PATCH 3/3] V4L: cinergyT2, remove bad usage of ERESTARTSYS
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cinergyT2, remove bad usage of ERESTARTSYS

test of cinergyt2->disconnect_pending doesn't ensure pending signal and so
ERESTARTSYS would reach userspace, which is not permitted. Change it to
EAGAIN

Signed-off-by: Jiri Slaby <jirislaby@gmail.com>

---
commit b227f5517ddd99f581a9d241c8ba9c50c50fbc3e
tree f469eea4a298db2d4fe27313e48901d74211b2ca
parent 235cf594bc65128250632a642f3e9d7e4df4975e
author Jiri Slaby <jirislaby@gmail.com> Mon, 08 Oct 2007 14:24:32 +0200
committer Jiri Slaby <jirislaby@gmail.com> Mon, 08 Oct 2007 14:24:32 +0200
drivers/media/dvb/cinergyT2/cinergyT2.c | 38 ++++++++++++++++++++-----------
1 files changed, 25 insertions(+), 13 deletions(-)
diff --git a/drivers/media/dvb/cinergyT2/cinergyT2.c b/drivers/media/dvb/cinergyT2/cinergyT2.c
index 154a7ce..a1f6ebd 100644
--- a/drivers/media/dvb/cinergyT2/cinergyT2.c
+++ b/drivers/media/dvb/cinergyT2/cinergyT2.c
@@ -345,7 +345,9 @@ static int cinergyt2_start_feed(struct dvb_demux_feed *dvbdmxfeed)
struct dvb_demux *demux = dvbdmxfeed->demux;
struct cinergyt2 *cinergyt2 = demux->priv;

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

if (cinergyt2->streaming == 0)
@@ -361,7 +363,9 @@ static int cinergyt2_stop_feed(struct dvb_demux_feed *dvbdmxfeed)
struct dvb_demux *demux = dvbdmxfeed->demux;
struct cinergyt2 *cinergyt2 = demux->priv;

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

if (--cinergyt2->streaming == 0)
@@ -481,12 +485,14 @@ static int cinergyt2_open (struct inode *inode, struct file *file)
{
struct dvb_device *dvbdev = file->private_data;
struct cinergyt2 *cinergyt2 = dvbdev->priv;
- int err = -ERESTARTSYS;
+ int err = -EAGAIN;

- if (cinergyt2->disconnect_pending || mutex_lock_interruptible(&cinergyt2->wq_sem))
+ if (cinergyt2->disconnect_pending)
+ goto out;
+ if ((err = mutex_lock_interruptible(&cinergyt2->wq_sem)))
goto out;

- if (mutex_lock_interruptible(&cinergyt2->sem))
+ if ((err = mutex_lock_interruptible(&cinergyt2->sem)))
goto out_unlock1;

if ((err = dvb_generic_open(inode, file)))
@@ -550,7 +556,9 @@ static unsigned int cinergyt2_poll (struct file *file, struct poll_table_struct
struct cinergyt2 *cinergyt2 = dvbdev->priv;
unsigned int mask = 0;

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

poll_wait(file, &cinergyt2->poll_wq, wait);
@@ -625,7 +633,9 @@ static int cinergyt2_ioctl (struct inode *inode, struct file *file,
if (copy_from_user(&p, (void __user*) arg, sizeof(p)))
return -EFAULT;

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

param->cmd = CINERGYT2_EP1_SET_TUNER_PARAMETERS;
@@ -996,7 +1006,9 @@ static int cinergyt2_suspend (struct usb_interface *intf, pm_message_t state)
{
struct cinergyt2 *cinergyt2 = usb_get_intfdata (intf);

- if (cinergyt2->disconnect_pending || mutex_lock_interruptible(&cinergyt2->wq_sem))
+ if (cinergyt2->disconnect_pending)
+ return -EAGAIN;
+ if (mutex_lock_interruptible(&cinergyt2->wq_sem))
return -ERESTARTSYS;

cinergyt2_suspend_rc(cinergyt2);
@@ -1017,16 +1029,16 @@ static int cinergyt2_resume (struct usb_interface *intf)
{
struct cinergyt2 *cinergyt2 = usb_get_intfdata (intf);
struct dvbt_set_parameters_msg *param = &cinergyt2->param;
- int err = -ERESTARTSYS;
+ int err = -EAGAIN;

- if (cinergyt2->disconnect_pending || mutex_lock_interruptible(&cinergyt2->wq_sem))
+ if (cinergyt2->disconnect_pending)
+ goto out;
+ if ((err = mutex_lock_interruptible(&cinergyt2->wq_sem)))
goto out;

- if (mutex_lock_interruptible(&cinergyt2->sem))
+ if ((err = mutex_lock_interruptible(&cinergyt2->sem)))
goto out_unlock1;

- err = 0;
-
if (!cinergyt2->sleeping) {
cinergyt2_sleep(cinergyt2, 0);
cinergyt2_command(cinergyt2, (char *) param, sizeof(*param), NULL, 0);
-
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