This is a note to let you know that I've just added the patch titled
printk: Fix rq->lock vs logbuf_lock unlock lock inversion
to the 3.4-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
printk-fix-rq-lock-vs-logbuf_lock-unlock-lock-inversion.patch
and it can be found in the queue-3.4 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <[email protected]> know about it.
>From ff766b8d26c7669cc1ae9048a04cf0dd5607f02c Mon Sep 17 00:00:00 2001
From: "Bu, Yitian" <[email protected]>
Date: Mon, 18 Feb 2013 12:53:37 +0000
Subject: printk: Fix rq->lock vs logbuf_lock unlock lock inversion
From: "Bu, Yitian" <[email protected]>
commit dbda92d16f8655044e082930e4e9d244b87fde77 upstream.
commit 07354eb1a74d1 ("locking printk: Annotate logbuf_lock as raw")
reintroduced a lock inversion problem which was fixed in commit
0b5e1c5255 ("printk: Release console_sem after logbuf_lock"). This
happened probably when fixing up patch rejects.
Restore the ordering and unlock logbuf_lock before releasing
console_sem.
Signed-off-by: ybu <[email protected]>
Cc: Peter Zijlstra <[email protected]>
Link:
http://lkml.kernel.org/r/e807e903fe6cbe4d95e420fbfcc273b8274...@nasanexd01h.na.qualcomm.com
Signed-off-by: Thomas Gleixner <[email protected]>
[bwh: Backported to 3.2: adjust context]
Signed-off-by: Ben Hutchings <[email protected]>
Cc: Qiang Huang <[email protected]>
Cc: Li Zefan <[email protected]>
Cc: Jianguo Wu <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>
---
kernel/printk.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
--- a/kernel/printk.c
+++ b/kernel/printk.c
@@ -822,9 +822,9 @@ static int console_trylock_for_printk(un
}
}
printk_cpu = UINT_MAX;
+ raw_spin_unlock(&logbuf_lock);
if (wake)
up(&console_sem);
- raw_spin_unlock(&logbuf_lock);
return retval;
}
static const char recursion_bug_msg [] =
Patches currently in stable-queue which might be from [email protected] are
queue-3.4/printk-fix-rq-lock-vs-logbuf_lock-unlock-lock-inversion.patch
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