linux-kernel - [PATCH 3.4 106/146] sd: Disable support for 256 byte/sector disks

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Message-Id: <1442307861-32031-106-git-send-email-lizf@kernel.org>
Date:	Tue, 15 Sep 2015 17:03:41 +0800
From:	lizf@...nel.org
To:	stable@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org, Mark Hounschell <dmarkh@....rr.com>,
	Hannes Reinecke <hare@...e.de>,
	James Bottomley <JBottomley@...n.com>,
	Zefan Li <lizefan@...wei.com>
Subject: [PATCH 3.4 106/146] sd: Disable support for 256 byte/sector disks

From: Mark Hounschell <dmarkh@....rr.com>

3.4.109-rc1 review patch.  If anyone has any objections, please let me know.

------------------


commit 74856fbf441929918c49ff262ace9835048e4e6a upstream.

256 bytes per sector support has been broken since 2.6.X,
and no-one stepped up to fix this.
So disable support for it.

Signed-off-by: Mark Hounschell <dmarkh@....rr.com>
Signed-off-by: Hannes Reinecke <hare@...e.de>
Signed-off-by: James Bottomley <JBottomley@...n.com>
[lizf: Backported to 3.4: adjust context]
Signed-off-by: Zefan Li <lizefan@...wei.com>
---
 drivers/scsi/sd.c | 20 ++++++--------------
 1 file changed, 6 insertions(+), 14 deletions(-)

diff --git a/drivers/scsi/sd.c b/drivers/scsi/sd.c
index 7f6746a..97aa6c6 100644
--- a/drivers/scsi/sd.c
+++ b/drivers/scsi/sd.c
@@ -1423,6 +1423,7 @@ static unsigned int sd_completed_bytes(struct scsi_cmnd *scmd)
 {
 	u64 start_lba = blk_rq_pos(scmd->request);
 	u64 end_lba = blk_rq_pos(scmd->request) + (scsi_bufflen(scmd) / 512);
+	u64 factor = scmd->device->sector_size / 512;
 	u64 bad_lba;
 	int info_valid;
 	/*
@@ -1444,16 +1445,10 @@ static unsigned int sd_completed_bytes(struct scsi_cmnd *scmd)
 	if (scsi_bufflen(scmd) <= scmd->device->sector_size)
 		return 0;
 
-	if (scmd->device->sector_size < 512) {
-		/* only legitimate sector_size here is 256 */
-		start_lba <<= 1;
-		end_lba <<= 1;
-	} else {
-		/* be careful ... don't want any overflows */
-		u64 factor = scmd->device->sector_size / 512;
-		do_div(start_lba, factor);
-		do_div(end_lba, factor);
-	}
+	/* be careful ... don't want any overflows */
+	factor = scmd->device->sector_size / 512;
+	do_div(start_lba, factor);
+	do_div(end_lba, factor);
 
 	/* The bad lba was reported incorrectly, we have no idea where
 	 * the error is.
@@ -1984,8 +1979,7 @@ got_data:
 	if (sector_size != 512 &&
 	    sector_size != 1024 &&
 	    sector_size != 2048 &&
-	    sector_size != 4096 &&
-	    sector_size != 256) {
+	    sector_size != 4096) {
 		sd_printk(KERN_NOTICE, sdkp, "Unsupported sector size %d.\n",
 			  sector_size);
 		/*
@@ -2034,8 +2028,6 @@ got_data:
 		sdkp->capacity <<= 2;
 	else if (sector_size == 1024)
 		sdkp->capacity <<= 1;
-	else if (sector_size == 256)
-		sdkp->capacity >>= 1;
 
 	blk_queue_physical_block_size(sdp->request_queue,
 				      sdkp->physical_block_size);
-- 
1.9.1

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