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drivers/video: release mutex in error handling code

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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>
This commit is contained in:
Julia Lawall 2008-07-29 22:33:28 -07:00 committed by Linus Torvalds
parent d667b6ddbc
commit 950d442ad0
2 changed files with 6 additions and 12 deletions
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9
drivers/video/arkfb.c
View file

@ -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;
}

9
drivers/video/vt8623fb.c
View file

@ -853,11 +853,8 @@ static int vt8623_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);
@ -870,8 +867,8 @@ static int vt8623_pci_resume(struct pci_dev* dev)
vt8623fb_set_par(info);
fb_set_suspend(info, 0);
mutex_unlock(&(par->open_lock));
fail:
mutex_unlock(&(par->open_lock));
release_console_sem();
return 0;