linux-kernel - Re: [PATCH] Initialise scatter/gather list in ata_sg

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Message-ID: <20071026115859.GJ5155@kernel.dk>
Date:	Fri, 26 Oct 2007 13:58:59 +0200
From:	Jens Axboe <jens.axboe@...cle.com>
To:	Anton Blanchard <anton@...ba.org>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] Initialise scatter/gather list in ata_sg_setup

On Thu, Oct 25 2007, Anton Blanchard wrote:
> 
> (Sorry the subject was incorrect)...
> 
> After turning on DEBUG_SG I hit a fail:
> 
> kernel BUG at include/linux/scatterlist.h:50!
> 
> 	ata_qc_issue
> 	ata_scsi_translate
> 	ipr_queuecommand
> 	scsi_dispatch_cmd
> 	scsi_request_fn
> 	elv_insert
> 	blk_execute_rq_nowait
> 	blk_execute_rq
> 	sg_io
> 	scsi_cmd_ioctl
> 	cdrom_ioctl
> 	sr_block_ioctl
> 	blkdev_driver_ioctl
> 	blkdev_ioctl
> 	block_ioctl
> 	do_ioctl
> 	vfs_ioctl
> 	sys_ioctl
> 	sg_ioctl_trans
> 
> It looks like ata_sg_setup is working on an uninitialised sg table. Call
> sg_init_table to initialise it before use.
> 
> Signed-off-by: Anton Blanchard <anton@...ba.org>
> ---
> 
> Jens this is against your sg branch. This fixes the fail but Id
> appreciate a confirmation that it's the right fix :)

The patch looks OK, you could also get away with just doing that
sg_init_table() on qc init/alloc.


-- 
Jens Axboe

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