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Subject[PATCH] blk: avoid divide-by-zero with zero granularity
Date
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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