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scsi: core: Fix the return value of scsi_logical_block_count()

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commit f03e94f23b upstream.

scsi_logical_block_count() should return the block count of a given SCSI
command. The original implementation ended up shifting twice, leading to an
incorrect count being returned. Fix the conversion between bytes and
logical blocks.

Cc: stable@vger.kernel.org
Fixes: 6a20e21ae1 ("scsi: core: Add helper to return number of logical blocks in a request")
Signed-off-by: Chaotian Jing <chaotian.jing@mediatek.com>
Link: https://lore.kernel.org/r/20240813053534.7720-1-chaotian.jing@mediatek.com
Reviewed-by: Bart Van Assche <bvanassche@acm.org>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Chaotian Jing 2024-08-13 13:34:10 +08:00 committed by Greg Kroah-Hartman
parent 064dd929c7
commit 76df3a1970
1 changed files with 1 additions and 1 deletions
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2
include/scsi/scsi_cmnd.h
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@ -234,7 +234,7 @@ static inline sector_t scsi_get_lba(struct scsi_cmnd *scmd)
static inline unsigned int scsi_logical_block_count(struct scsi_cmnd *scmd) static inline unsigned int scsi_logical_block_count(struct scsi_cmnd *scmd)
{ {
unsigned int shift = ilog2(scmd->device->sector_size) - SECTOR_SHIFT; unsigned int shift = ilog2(scmd->device->sector_size);
return blk_rq_bytes(scsi_cmd_to_rq(scmd)) >> shift; return blk_rq_bytes(scsi_cmd_to_rq(scmd)) >> shift;
} }