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Date: Tue, 23 Jul 2013 15:26:23 -0700 From: Greg Kroah-Hartman <gregkh@...uxfoundation.org> To: linux-kernel@...r.kernel.org Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>, stable@...r.kernel.org, ybu <ybu@....qualcomm.com>, Peter Zijlstra <a.p.zijlstra@...llo.nl>, Thomas Gleixner <tglx@...utronix.de> Subject: [ 072/103] printk: Fix rq->lock vs logbuf_lock unlock lock inversion 3.10-stable review patch. If anyone has any objections, please let me know. ------------------ From: "Bu, Yitian" <ybu@....qualcomm.com> 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 <ybu@....qualcomm.com> Cc: Peter Zijlstra <a.p.zijlstra@...llo.nl> Link: http://lkml.kernel.org/r/E807E903FE6CBE4D95E420FBFCC273B827413C@nasanexd01h.na.qualcomm.com Signed-off-by: Thomas Gleixner <tglx@...utronix.de> Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org> --- kernel/printk.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) --- a/kernel/printk.c +++ b/kernel/printk.c @@ -1369,9 +1369,9 @@ static int console_trylock_for_printk(un } } logbuf_cpu = UINT_MAX; + raw_spin_unlock(&logbuf_lock); if (wake) up(&console_sem); - raw_spin_unlock(&logbuf_lock); return retval; } -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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