linux-kernel - [PATCH] scsi: Do not call do

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Date:	Mon,  4 Nov 2013 10:21:05 +0100
From:	Geert Uytterhoeven <geert@...ux-m68k.org>
To:	"James E.J. Bottomley" <JBottomley@...allels.com>,
	Andrew Morton <akpm@...ux-foundation.org>
Cc:	linux-scsi@...r.kernel.org, linux-kernel@...r.kernel.org,
	Geert Uytterhoeven <geert@...ux-m68k.org>
Subject: [PATCH] scsi: Do not call do_div() with a 64-bit divisor

do_div() is meant for divisions of 64-bit number by 32-bit numbers.
Passing 64-bit divisor types caused issues in the past on 32-bit platforms,
cfr. commit ea077b1b96e073eac5c3c5590529e964767fc5f7 ("m68k: Truncate base
in do_div()").

As scsi_device.sector_size is unsigned (int), factor should be unsigned
int, too.

Signed-off-by: Geert Uytterhoeven <geert@...ux-m68k.org>
---
 drivers/scsi/sd.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/scsi/sd.c b/drivers/scsi/sd.c
index 5693f6d7eddb..d6645c70cceb 100644
--- a/drivers/scsi/sd.c
+++ b/drivers/scsi/sd.c
@@ -1607,7 +1607,7 @@ static unsigned int sd_completed_bytes(struct scsi_cmnd *scmd)
 		end_lba <<= 1;
 	} else {
 		/* be careful ... don't want any overflows */
-		u64 factor = scmd->device->sector_size / 512;
+		unsigned int factor = scmd->device->sector_size / 512;
 		do_div(start_lba, factor);
 		do_div(end_lba, factor);
 	}
-- 
1.7.9.5

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