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block: Fix transfer when chunk sectors exceeds max 

commit 15bfd21fbc upstream.

A device may have boundary restrictions where the number of sectors
between boundaries exceeds its max transfer size. In this case, we need
to cap the max size to the smaller of the two limits.

Reported-by: Jitendra Bhivare <jitendra.bhivare@broadcom.com>
Tested-by: Jitendra Bhivare <jitendra.bhivare@broadcom.com>
Cc: <stable@vger.kernel.org>
Reviewed-by: Martin K. Petersen <martin.petersen@oracle.com>
Signed-off-by: Keith Busch <keith.busch@intel.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Keith Busch 2018-06-26 09:14:58 -06:00 committed by Greg Kroah-Hartman
parent 804a0db743
commit 29413e068b
1 changed files with 2 additions and 2 deletions
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4
include/linux/blkdev.h
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@ -1088,8 +1088,8 @@ static inline unsigned int blk_max_size_offset(struct request_queue *q,
if (!q->limits.chunk_sectors)
return q->limits.max_sectors;
return q->limits.chunk_sectors -
(offset & (q->limits.chunk_sectors - 1));
return min(q->limits.max_sectors, (unsigned int)(q->limits.chunk_sectors -
(offset & (q->limits.chunk_sectors - 1))));
}
static inline unsigned int blk_rq_get_max_sectors(struct request *rq,