From: Andrew Morton <akpm@digeo.com>
To: Piet/Pete Delaney <piet@www.piet.net>
Cc: linux-kernel@vger.kernel.org
Subject: Re: aic7xxx driver potentially sleeping with spin lock held in linux-2.5.48 (mm1 patch)
Date: Mon, 25 Nov 2002 11:29:24 -0800 [thread overview]
Message-ID: <3DE27A14.598EB80D@digeo.com> (raw)
In-Reply-To: <20021125123219.GA3103@www.piet.net>
Piet/Pete Delaney wrote:
>
> I'm getting a scsi problem in the aic7xxx driver sleeping while the preempt_count() != 0.
> Looks like we are holding a spinlock where the slab allocator could go to sleep.
>
> ...
> #5 0xc029104d in aic7xxx_alloc_aic_dev (p=0xc3f7d56c, SDptr=0xc3ed3c00) at drivers/scsi/aic7xxx_old.c:6636
This does an GFP_KERNEL allocation
> #6 0xc029717d in aic7xxx_queue (cmd=0xc3efca00, fn=0xc0280f04 <scsi_done>) at drivers/scsi/aic7xxx_old.c:10341
> #7 0xc0280a26 in scsi_dispatch_cmd (SCpnt=0xc3efca00) at drivers/scsi/scsi.c:852 <--- spin lock grabed at Line 851 just prior to call to queuecommand()
OK.
> #8 0xc0285ed2 in scsi_request_fn (q=0xc3ed3c28) at drivers/scsi/scsi_lib.c:1061
> #9 0xc0253715 in blk_insert_request (q=0xc3ed3c28, rq=0xc3efc88c, at_head=0, data=0xc3efc800) at drivers/block/ll_rw_blk.c:1456
And this took the queue lock.
It's aic7xxx_old.c. Presumably it is headed for the scrap
heap. The allocation is a once-off startup thing. Probably
not worth worrying about.
prev parent reply other threads:[~2002-11-25 19:22 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2002-11-25 12:32 Piet/Pete Delaney
2002-11-25 19:29 ` Andrew Morton [this message]
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