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sd: Optimal I/O size is in bytes, not sectors
Commitca369d51b3
("block/sd: Fix device-imposed transfer length limits") accidentally switched optimal I/O size reporting from bytes to block layer sectors. Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com> Reported-by: Christian Borntraeger <borntraeger@de.ibm.com> Tested-by: Christian Borntraeger <borntraeger@de.ibm.com> Fixes:ca369d51b3
Cc: stable@vger.kernel.org # 4.4+ Reviewed-by: James E.J. Bottomley <James.Bottomley@HansenPartnership.com> Reviewed-by: Ewan D. Milne <emilne@redhat.com> Reviewed-by: Matthew R. Ochs <mrochs@linux.vnet.ibm.com>
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@ -2893,7 +2893,7 @@ static int sd_revalidate_disk(struct gendisk *disk)
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sdkp->opt_xfer_blocks <= SD_DEF_XFER_BLOCKS &&
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sdkp->opt_xfer_blocks * sdp->sector_size >= PAGE_CACHE_SIZE)
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rw_max = q->limits.io_opt =
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logical_to_sectors(sdp, sdkp->opt_xfer_blocks);
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sdkp->opt_xfer_blocks * sdp->sector_size;
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else
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rw_max = BLK_DEF_MAX_SECTORS;
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