[PATCH 4.0 126/148] sd: Disable support for 256 byte/sector disks

Greg Kroah-Hartman
2015-06-03T12:40:47Z

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

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@cfl.rr.com>
Signed-off-by: Hannes Reinecke <hare@suse.de>
Signed-off-by: James Bottomley <JBottomley@Odin.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
drivers/scsi/sd.c | 19 +++++--------------
1 file changed, 5 insertions(+), 14 deletions(-)

--- a/drivers/scsi/sd.c
+++ b/drivers/scsi/sd.c
@@ -1624,6 +1624,7 @@ static unsigned int sd_completed_bytes(s
{
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;
/*
@@ -1645,16 +1646,9 @@ static unsigned int sd_completed_bytes(s
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 */
- unsigned int factor = scmd->device->sector_size / 512;
- do_div(start_lba, factor);
- do_div(end_lba, factor);
- }
+ /* be careful ... don't want any overflows */
+ do_div(start_lba, factor);
+ do_div(end_lba, factor);

/* The bad lba was reported incorrectly, we have no idea where
* the error is.
@@ -2212,8 +2206,7 @@ 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);
/*
@@ -2268,8 +2261,6 @@ 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);