From: Anton Blanchard <anton@samba.org>
To: jens.axboe@oracle.com
Cc: linux-kernel@vger.kernel.org
Subject: [PATCH] Initialise scatter/gather list in ata_sg_setup
Date: Thu, 25 Oct 2007 14:32:26 -0500 [thread overview]
Message-ID: <20071025193226.GA20459@kryten> (raw)
In-Reply-To: <20071025192959.GA5827@kryten>
(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@samba.org>
---
Jens this is against your sg branch. This fixes the fail but Id
appreciate a confirmation that it's the right fix :)
diff --git a/drivers/ata/libata-core.c b/drivers/ata/libata-core.c
index b5f7c59..4de41bb 100644
--- a/drivers/ata/libata-core.c
+++ b/drivers/ata/libata-core.c
@@ -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));
next prev parent reply other threads:[~2007-10-25 19:36 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-10-25 19:29 [PATCH] Initialise scatter/gather list in sg driver Anton Blanchard
2007-10-25 19:32 ` Anton Blanchard [this message]
2007-10-26 11:58 ` [PATCH] Initialise scatter/gather list in ata_sg_setup Jens Axboe
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