From 3b0e044d5a881c937293a045158149514b86783c Mon Sep 17 00:00:00 2001
From: Kiyoshi Ueda <k-ueda@ct.jp.nec.com>
Date: Mon, 11 Feb 2008 00:32:11 +0100
Subject: [PATCH] ide: another possible ide panic fix for blk-end-request
I have reviewed all blk-end-request patches again to confirm whether
there are any similar problems with the last week's ide-cd panic:
http://lkml.org/lkml/2008/1/29/140
And I found a possible similar bug in ide-io change:
ide_end_drive_cmd() could be called for blk_pc_request() which could
have bios. To complete such requests correctly, we need to pass
the actual size of the request.
Otherwise, __blk_end_request() returns 1 because the request still has
bios, and the system will BUG() unnecessarily.
The following patch fixes the bug and should be applied on top of
Linus' git.
Signed-off-by: Kiyoshi Ueda <k-ueda@ct.jp.nec.com>
Signed-off-by: Jun'ichi Nomura <j-nomura@ce.jp.nec.com>
Cc: Borislav Petkov <petkovbb@googlemail.com>
Cc: Jens Axboe <jens.axboe@oracle.com>
Signed-off-by: Bartlomiej Zolnierkiewicz <bzolnier@gmail.com>
---
drivers/ide/ide-io.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
diff --git a/drivers/ide/ide-io.c b/drivers/ide/ide-io.c
index 3addbe478d26..e41383fa3a51 100644
--- a/drivers/ide/ide-io.c
+++ b/drivers/ide/ide-io.c
@@ -388,7 +388,8 @@ void ide_end_drive_cmd (ide_drive_t *drive, u8 stat, u8 err)
spin_lock_irqsave(&ide_lock, flags);
HWGROUP(drive)->rq = NULL;
rq->errors = err;
- if (__blk_end_request(rq, (rq->errors ? -EIO : 0), 0))
+ if (unlikely(__blk_end_request(rq, (rq->errors ? -EIO : 0),
+ blk_rq_bytes(rq))))
BUG();
spin_unlock_irqrestore(&ide_lock, flags);
}
--
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