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V4L/DVB: drivers/media/video/pvrusb2: Add missing mutex_unlock 

Add a mutex_unlock missing on the error path.  In the other functions in
the same file the locks and unlocks of this mutex appear to be balanced,
so it would seem that the same should hold in this case.

The semantic match that finds this problem is as follows:
(http://coccinelle.lip6.fr/)

// <smpl>
@@
expression E1;
@@

* mutex_lock(E1,...);
  <+... when != E1
  if (...) {
    ... when != E1
*   return ...;
  }
  ...+>
* mutex_unlock(E1,...);
// </smpl>

Signed-off-by: Julia Lawall <julia@diku.dk>
Signed-off-by: Douglas Schilling Landgraf <dougsland@redhat.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
This commit is contained in:
Julia Lawall 2010-06-29 01:42:53 -03:00 committed by Mauro Carvalho Chehab
parent a3b1dc9557
commit 4c61f678a4
1 changed files with 4 additions and 1 deletions
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5
drivers/media/video/pvrusb2/pvrusb2-ioread.c
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@ -223,7 +223,10 @@ int pvr2_ioread_setup(struct pvr2_ioread *cp,struct pvr2_stream *sp)
" pvr2_ioread_setup (setup) id=%p",cp);
pvr2_stream_kill(sp);
ret = pvr2_stream_set_buffer_count(sp,BUFFER_COUNT);
if (ret < 0) return ret;
if (ret < 0) {
mutex_unlock(&cp->mutex);
return ret;
}
for (idx = 0; idx < BUFFER_COUNT; idx++) {
bp = pvr2_stream_get_buffer(sp,idx);
pvr2_buffer_set_buffer(bp,