linux-kernel - [PATCH] block: use jiffies conversion functions in scsi

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Date:	Wed, 05 Dec 2007 12:29:55 +0900
From:	Tejun Heo <htejun@...il.com>
To:	Jens Axboe <jens.axboe@...cle.com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: [PATCH] block: use jiffies conversion functions in scsi_ioctl.c

Use msecs_to_jiffies() and jiffies_to_msecs() in scsi_ioctl().
Sometimes callers use very large values for e.g. vendor specific media
clear command and calculation can overflow.

Signed-off-by: Tejun Heo <htejun@...il.com>
---
 block/scsi_ioctl.c |    4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/block/scsi_ioctl.c b/block/scsi_ioctl.c
index 91c7322..9675b34 100644
--- a/block/scsi_ioctl.c
+++ b/block/scsi_ioctl.c
@@ -230,7 +230,7 @@ static int blk_fill_sghdr_rq(struct request_queue *q, struct request *rq,
 	rq->cmd_len = hdr->cmd_len;
 	rq->cmd_type = REQ_TYPE_BLOCK_PC;
 
-	rq->timeout = (hdr->timeout * HZ) / 1000;
+	rq->timeout = msecs_to_jiffies(hdr->timeout);
 	if (!rq->timeout)
 		rq->timeout = q->sg_timeout;
 	if (!rq->timeout)
@@ -366,7 +366,7 @@ static int sg_io(struct file *file, struct request_queue *q,
 	 */
 	blk_execute_rq(q, bd_disk, rq, 0);
 
-	hdr->duration = ((jiffies - start_time) * 1000) / HZ;
+	hdr->duration = jiffies_to_msecs(jiffies - start_time);
 
 	return blk_complete_sghdr_rq(rq, hdr, bio);
 out:

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