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authorPaul Mundt <lethal@linux-sh.org>2009-07-03 15:45:56 +0900
committerLinus Torvalds <torvalds@linux-foundation.org>2009-07-04 10:39:06 -0700
commitf50bf2b2f5e83b794e0bdb2f3f589f55ef0d52d0 (patch)
tree01020b4eaa2df173889ebcfb71f7dc02097dede6
parentde481ba925e880764e38b8756c93c05006892507 (diff)
downloadlinux-stericsson-f50bf2b2f5e83b794e0bdb2f3f589f55ef0d52d0.tar.gz
video: sm501fb: Early initialization of mm_lock mutex.
Commit 537a1bf059fa312355696fa6db80726e655e7f17 (fbdev: add mutex for fb_mmap locking) introduces a ->mm_lock mutex for protecting smem assignments. Unfortunately in the case of sm501fb these happen quite early in the initialization code, well before the mutex_init() that takes place in register_framebuffer(), leading to: Badness at kernel/mutex.c:207 Pid : 1, Comm: swapper CPU : 0 Not tainted (2.6.31-rc1-00284-g529ba0d-dirty #2273) PC is at __mutex_lock_slowpath+0x72/0x1bc PR is at __mutex_lock_slowpath+0x66/0x1bc ... matroxfb appears to have the same issue and has solved it with an early mutex_init(), so we do the same for sm501fb. Signed-off-by: Paul Mundt <lethal@linux-sh.org> Cc: Krzysztof Helt <krzysztof.h1@wp.pl> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
-rw-r--r--drivers/video/sm501fb.c2
1 files changed, 2 insertions, 0 deletions
diff --git a/drivers/video/sm501fb.c b/drivers/video/sm501fb.c
index 98f24f0ec00d..16d4f4c7d52b 100644
--- a/drivers/video/sm501fb.c
+++ b/drivers/video/sm501fb.c
@@ -1624,6 +1624,8 @@ static int __devinit sm501fb_start_one(struct sm501fb_info *info,
if (!fbi)
return 0;
+ mutex_init(&info->fb[head]->mm_lock);
+
ret = sm501fb_init_fb(info->fb[head], head, drvname);
if (ret) {
dev_err(info->dev, "cannot initialise fb %s\n", drvname);