linux-kernel - Re: [bug - scsi/blk] -git, WARNING: at include/linux/blkdev.h:427 __blk_run

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Date:	Tue, 29 Apr 2008 22:04:20 +0200
From:	Jens Axboe <jens.axboe@...cle.com>
To:	Ingo Molnar <mingo@...e.hu>
Cc:	linux-kernel@...r.kernel.org, Jeff Garzik <jgarzik@...ox.com>,
	James Bottomley <James.Bottomley@...senPartnership.com>
Subject: Re: [bug - scsi/blk] -git, WARNING: at include/linux/blkdev.h:427  __blk_run_queue+0x74/0xa0()

On Tue, Apr 29 2008, Ingo Molnar wrote:
> 
> x86.git auto-testing found two new warnings below with latest -git:
> 
>  WARNING: at include/linux/blkdev.h:439 blk_remove_plug+0x69/0x80()
>  WARNING: at include/linux/blkdev.h:427 __blk_run_queue+0x74/0xa0()
> 
> one seems a relatively harmless init locking bug (unlocked access in a 
> probe function), the other seems scarier as it happens in an irq handler 
> and it likely would trigger multiple times if it wasnt a WARN_ON_ONCE().
> 
> Config and full log at:
> 
>  http://redhat.com/~mingo/misc/log-Tue_Apr_29_21_40_46_CEST_2008.bad
>  http://redhat.com/~mingo/misc/config-Tue_Apr_29_21_40_46_CEST_2008.bad

404 on those, but I think Bart and I already closed this one:

diff --git a/include/linux/blkdev.h b/include/linux/blkdev.h
index 669b65c..9e2e23b 100644
--- a/include/linux/blkdev.h
+++ b/include/linux/blkdev.h
@@ -418,8 +418,12 @@ struct request_queue
 
 static inline int queue_is_locked(struct request_queue *q)
 {
+#ifdef CONFIG_SMP
 	spinlock_t *lock = q->queue_lock;
 	return lock && spin_is_locked(lock);
+#else
+	return 1;
+#endif
 }
 
 static inline void queue_flag_set_unlocked(unsigned int flag,

-- 
Jens Axboe

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