scsi: sd: Consider max_xfer_blocks if opt_xfer_blocks is unusable

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If device reports a small max_xfer_blocks and a zero opt_xfer_blocks, we
end up using BLK_DEF_MAX_SECTORS, which is wrong and r/w of that size
may get error.

[mkp: tweaked to avoid setting rw_max twice and added typecast]

Cc: <stable@vger.kernel.org> # v4.4+
Fixes: ca369d51b3 ("block/sd: Fix device-imposed transfer length limits")
Signed-off-by: Fam Zheng <famz@redhat.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>

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Fam Zheng 2017-03-28 12:41:26 +08:00 • committed by Martin K. Petersen

parent a3902ee983

commit 6780414519

1 changed files with 2 additions and 1 deletions

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drivers/scsi/sd.c

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