From: Anton Blanchard <anton@samba.org>
Date: Fri, 26 Oct 2007 11:59:44 +0000 (+0200)
Subject: Initialise scatter/gather list in ata_sg_setup
X-Git-Tag: v2.6.24-rc2~104^2~4
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=acd054a5ef401e03e0047b487e572442614f81e5;p=pandora-kernel.git

Initialise scatter/gather list in ata_sg_setup

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@samba.org>

Note: this patch will fix it, but you could also get away with just
doing the sg_init_table() once at qc creation time.

Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
---

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