V4L/DVB: dvb: siano: free spinlock before schedule()

Calling schedule() holding spinlock with disables irqs is improper. As
spinlock protects list coredev->buffers, it can be unlocked untill wakeup.
This bug was introduced in a9349315f65cd6a16e8fab1f6cf0fd40f379c4db.

Signed-off-by: Kulikov Vasiliy <segooon@gmail.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

1 files changed, 4 insertions, 2 deletions

diff --git a/drivers/media/dvb/siano/smscoreapi.c b/drivers/media/dvb/siano/smscoreapi.c
index 7f2c94a15ab1..d93468cd3a85 100644
--- a/drivers/media/dvb/siano/smscoreapi.c
+++ b/drivers/media/dvb/siano/smscoreapi.c
@@ -1113,9 +1113,11 @@ struct smscore_buffer_t *smscore_getbuffer(struct smscore_device_t *coredev)
          */
 
         prepare_to_wait(&coredev->buffer_mng_waitq, &wait, TASK_INTERRUPTIBLE);
-
-        if (list_empty(&coredev->buffers))
+        if (list_empty(&coredev->buffers)) {
+                spin_unlock_irqrestore(&coredev->bufferslock, flags);
                 schedule();
+                spin_lock_irqsave(&coredev->bufferslock, flags);
+        }
 
         finish_wait(&coredev->buffer_mng_waitq, &wait);