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

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: [email protected]
Fixes: 6a20e21 ("scsi: core: Add helper to return number of logical blocks in a request")
Signed-off-by: Chaotian Jing <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Reviewed-by: Bart Van Assche <[email protected]>
Signed-off-by: Martin K. Petersen <[email protected]>

Author: ChaotianJing

include/scsi/scsi_cmnd.h

@@ -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)
 {
-	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;
 }