framebuffer compat_ioctl deadlock
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 <mpatocka@redhat.com>
Cc: Alan Cox <alan@lxorguk.ukuu.org.uk>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
diff --git a/drivers/video/fbmem.c b/drivers/video/fbmem.c
index cd5f20d..6048b55 100644
--- a/drivers/video/fbmem.c
+++ b/drivers/video/fbmem.c
@@ -1262,8 +1262,8 @@
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);
