Messages in this thread Patch in this message | | | From | Li Feng <> | Subject | [PATCH] blk: avoid divide-by-zero with zero granularity | Date | Tue, 12 Jan 2021 23:29:51 +0800 |
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If the physical_block_size and io_min is less than a sector, the 'granularity >> SECTOR_SHIFT' will be zero.
Signed-off-by: Li Feng <fengli@smartx.com> --- include/linux/blkdev.h | 4 ++++ 1 file changed, 4 insertions(+)
diff --git a/include/linux/blkdev.h b/include/linux/blkdev.h index f94ee3089e01..4d029e95adb4 100644 --- a/include/linux/blkdev.h +++ b/include/linux/blkdev.h @@ -1485,6 +1485,10 @@ static inline int queue_alignment_offset(const struct request_queue *q) static inline int queue_limit_alignment_offset(struct queue_limits *lim, sector_t sector) { unsigned int granularity = max(lim->physical_block_size, lim->io_min); + granularity = granularity >> SECTOR_SHIFT; + if (!granularity) + return 0; + unsigned int alignment = sector_div(sector, granularity >> SECTOR_SHIFT) << SECTOR_SHIFT; -- 2.29.2
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