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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>
This commit is contained in:
Anton Blanchard 2007-10-26 13:59:44 +02:00 committed by Jens Axboe
parent 5336940dd8
commit acd054a5ef
1 changed files with 1 additions and 0 deletions
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1
drivers/ata/libata-core.c
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@ -4689,6 +4689,7 @@ static int ata_sg_setup(struct ata_queued_cmd *qc)
* data in this function or read data in ata_sg_clean.
*/
offset = lsg->offset + lsg->length - qc->pad_len;
sg_init_table(psg, 1);
sg_set_page(psg, nth_page(sg_page(lsg), offset >> PAGE_SHIFT),
qc->pad_len, offset_in_page(offset));