drivers/video: release mutex in error handling code

The mutex is released on a successful return, so it would seem that it
should be released on an error return as well.

The semantic patch finds this problem is as follows:
(http://www.emn.fr/x-info/coccinelle/)

// <smpl>
@@
expression l;
@@

mutex_lock(l);
... when != mutex_unlock(l)
    when any
    when strict
(
if (...) { ... when != mutex_unlock(l)
+   mutex_unlock(l);
    return ...;
}
|
mutex_unlock(l);
)
// </smpl>

Signed-off-by: Julia Lawall <julia@diku.dk>
Acked-by: Krzysztof Helt <krzysztof.h1@wp.pl>
Acked-by: Ondrej Zajicek <santiago@crfreenet.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 3 insertions, 6 deletions

diff --git a/drivers/video/arkfb.c b/drivers/video/arkfb.c
index 5001bd4ef466..38a1e8308c83 100644
--- a/drivers/video/arkfb.c
+++ b/drivers/video/arkfb.c
@@ -1126,11 +1126,8 @@ static int ark_pci_resume (struct pci_dev* dev)
         acquire_console_sem();
         mutex_lock(&(par->open_lock));
 
-        if (par->ref_count == 0) {
-                mutex_unlock(&(par->open_lock));
-                release_console_sem();
-                return 0;
-        }
+        if (par->ref_count == 0)
+                goto fail;
 
         pci_set_power_state(dev, PCI_D0);
         pci_restore_state(dev);
@@ -1143,8 +1140,8 @@ static int ark_pci_resume (struct pci_dev* dev)
         arkfb_set_par(info);
         fb_set_suspend(info, 0);
 
-        mutex_unlock(&(par->open_lock));
 fail:
+        mutex_unlock(&(par->open_lock));
         release_console_sem();
         return 0;
 }