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framebuffer compat_ioctl deadlock

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Fix deadlock in fb_compat_ioctl.  fb_compat_ioctl acquires a mutex and
calls fb_ioctl that tries to acquire that mutex too.  A regression added
during BKL removal.

Signed-off-by: Mikulas Patocka <[email protected]>
Cc: Alan Cox <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
This commit is contained in:
Mikulas Patocka 2008-10-29 14:01:17 -07:00 • committed by Linus Torvalds
commit 120a37470c
1 changed files with 2 additions and 2 deletions
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4
drivers/video/fbmem.c
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@ -1262,8 +1262,8 @@ fb_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
case FBIOPUT_CON2FBMAP:
arg = (unsigned long) compat_ptr(arg);
case FBIOBLANK:
ret = fb_ioctl(file, cmd, arg);
break;
mutex_unlock(&info->lock);
return fb_ioctl(file, cmd, arg);
case FBIOGET_FSCREENINFO:
ret = fb_get_fscreeninfo(inode, file, cmd, arg);