V4L/DVB (5400): Core: fix several locking related problems

Fix several instances of dvb-core functions using mutex_lock_interruptible
and returning -ERESTARTSYS where the calling function will either never
retry or never check the return value.
These cause a race condition with dvb_dmxdev_filter_free and
dvb_dvr_release, both of which are filesystem release functions whose
return value is ignored and will never be retried.  When this happens it
becomes impossible to open dvr0 again (-EBUSY) since it has not been
released properly.

Signed-off-by: Simon Arlott <simon@fire.lp0.eu>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Acked-By: Johannes Stezenbach <js@linuxtv.org>
Signed-off-by: Mauro Carvalho Chehab <mchehab@infradead.org>

3 files changed, 13 insertions, 29 deletions

diff --git a/drivers/media/dvb/dvb-core/dmxdev.c b/drivers/media/dvb/dvb-core/dmxdev.c
index fc77de45ca4d..a5c0e1a3e6d1 100644
--- a/drivers/media/dvb/dvb-core/dmxdev.c
+++ b/drivers/media/dvb/dvb-core/dmxdev.c
@@ -180,8 +180,7 @@ static int dvb_dvr_release(struct inode *inode, struct file *file)
         struct dvb_device *dvbdev = file->private_data;
         struct dmxdev *dmxdev = dvbdev->priv;
 
-        if (mutex_lock_interruptible(&dmxdev->mutex))
-                return -ERESTARTSYS;
+        mutex_lock(&dmxdev->mutex);
 
         if ((file->f_flags & O_ACCMODE) == O_WRONLY) {
                 dmxdev->demux->disconnect_frontend(dmxdev->demux);
@@ -673,13 +672,8 @@ static int dvb_demux_open(struct inode *inode, struct file *file)
 static int dvb_dmxdev_filter_free(struct dmxdev *dmxdev,
                                   struct dmxdev_filter *dmxdevfilter)
 {
-        if (mutex_lock_interruptible(&dmxdev->mutex))
-                return -ERESTARTSYS;
-
-        if (mutex_lock_interruptible(&dmxdevfilter->mutex)) {
-                mutex_unlock(&dmxdev->mutex);
-                return -ERESTARTSYS;
-        }
+        mutex_lock(&dmxdev->mutex);
+        mutex_lock(&dmxdevfilter->mutex);
 
         dvb_dmxdev_filter_stop(dmxdevfilter);
         dvb_dmxdev_filter_reset(dmxdevfilter);
diff --git a/drivers/media/dvb/dvb-core/dvb_demux.c b/drivers/media/dvb/dvb-core/dvb_demux.c
index fcff5eab21a3..6d8d1c3df863 100644
--- a/drivers/media/dvb/dvb-core/dvb_demux.c
+++ b/drivers/media/dvb/dvb-core/dvb_demux.c
@@ -673,8 +673,7 @@ static int dmx_ts_feed_stop_filtering(struct dmx_ts_feed *ts_feed)
         struct dvb_demux *demux = feed->demux;
         int ret;
 
-        if (mutex_lock_interruptible(&demux->mutex))
-                return -ERESTARTSYS;
+        mutex_lock(&demux->mutex);
 
         if (feed->state < DMX_STATE_GO) {
                 mutex_unlock(&demux->mutex);
@@ -748,8 +747,7 @@ static int dvbdmx_release_ts_feed(struct dmx_demux *dmx,
         struct dvb_demux *demux = (struct dvb_demux *)dmx;
         struct dvb_demux_feed *feed = (struct dvb_demux_feed *)ts_feed;
 
-        if (mutex_lock_interruptible(&demux->mutex))
-                return -ERESTARTSYS;
+        mutex_lock(&demux->mutex);
 
         if (feed->state == DMX_STATE_FREE) {
                 mutex_unlock(&demux->mutex);
@@ -916,8 +914,7 @@ static int dmx_section_feed_stop_filtering(struct dmx_section_feed *feed)
         struct dvb_demux *dvbdmx = dvbdmxfeed->demux;
         int ret;
 
-        if (mutex_lock_interruptible(&dvbdmx->mutex))
-                return -ERESTARTSYS;
+        mutex_lock(&dvbdmx->mutex);
 
         if (!dvbdmx->stop_feed) {
                 mutex_unlock(&dvbdmx->mutex);
@@ -942,8 +939,7 @@ static int dmx_section_feed_release_filter(struct dmx_section_feed *feed,
         struct dvb_demux_feed *dvbdmxfeed = (struct dvb_demux_feed *)feed;
         struct dvb_demux *dvbdmx = dvbdmxfeed->demux;
 
-        if (mutex_lock_interruptible(&dvbdmx->mutex))
-                return -ERESTARTSYS;
+        mutex_lock(&dvbdmx->mutex);
 
         if (dvbdmxfilter->feed != dvbdmxfeed) {
                 mutex_unlock(&dvbdmx->mutex);
@@ -1016,8 +1012,7 @@ static int dvbdmx_release_section_feed(struct dmx_demux *demux,
         struct dvb_demux_feed *dvbdmxfeed = (struct dvb_demux_feed *)feed;
         struct dvb_demux *dvbdmx = (struct dvb_demux *)demux;
 
-        if (mutex_lock_interruptible(&dvbdmx->mutex))
-                return -ERESTARTSYS;
+        mutex_lock(&dvbdmx->mutex);
 
         if (dvbdmxfeed->state == DMX_STATE_FREE) {
                 mutex_unlock(&dvbdmx->mutex);
@@ -1126,8 +1121,7 @@ static int dvbdmx_connect_frontend(struct dmx_demux *demux,
         if (demux->frontend)
                 return -EINVAL;
 
-        if (mutex_lock_interruptible(&dvbdemux->mutex))
-                return -ERESTARTSYS;
+        mutex_lock(&dvbdemux->mutex);
 
         demux->frontend = frontend;
         mutex_unlock(&dvbdemux->mutex);
@@ -1138,8 +1132,7 @@ static int dvbdmx_disconnect_frontend(struct dmx_demux *demux)
 {
         struct dvb_demux *dvbdemux = (struct dvb_demux *)demux;
 
-        if (mutex_lock_interruptible(&dvbdemux->mutex))
-                return -ERESTARTSYS;
+        mutex_lock(&dvbdemux->mutex);
 
         demux->frontend = NULL;
         mutex_unlock(&dvbdemux->mutex);
diff --git a/drivers/media/dvb/dvb-core/dvbdev.c b/drivers/media/dvb/dvb-core/dvbdev.c
index 490337b5ee3e..14a372a0fe8b 100644
--- a/drivers/media/dvb/dvb-core/dvbdev.c
+++ b/drivers/media/dvb/dvb-core/dvbdev.c
@@ -203,8 +203,7 @@ int dvb_register_device(struct dvb_adapter *adap, struct dvb_device **pdvbdev,
 
         int id;
 
-        if (mutex_lock_interruptible(&dvbdev_register_lock))
-                return -ERESTARTSYS;
+        mutex_lock(&dvbdev_register_lock);
 
         if ((id = dvbdev_get_free_id (adap, type)) < 0){
                 mutex_unlock(&dvbdev_register_lock);
@@ -294,8 +293,7 @@ int dvb_register_adapter(struct dvb_adapter *adap, const char *name, struct modu
 {
         int num;
 
-        if (mutex_lock_interruptible(&dvbdev_register_lock))
-                return -ERESTARTSYS;
+        mutex_lock(&dvbdev_register_lock);
 
         if ((num = dvbdev_get_free_adapter_num ()) < 0) {
                 mutex_unlock(&dvbdev_register_lock);
@@ -323,8 +321,7 @@ EXPORT_SYMBOL(dvb_register_adapter);
 
 int dvb_unregister_adapter(struct dvb_adapter *adap)
 {
-        if (mutex_lock_interruptible(&dvbdev_register_lock))
-                return -ERESTARTSYS;
+        mutex_lock(&dvbdev_register_lock);
         list_del (&adap->list_head);
         mutex_unlock(&dvbdev_register_lock);
         return 0;