scsi: ufs: core: Set the residual byte count

It is important for the SCSI core to know the residual byte count.  Hence,
extract the residual byte count from the UFS response and pass it to the
SCSI core. A few examples of the output of a debugging patch that has been
applied on top of this patch:

[    1.937750] cmd 0x12: len = 255; resid = 241
[ ... ]
[    1.993400] cmd 0xa0: len = 4096; resid = 4048
[ ... ]

Signed-off-by: Bart Van Assche <bvanassche@acm.org>
Link: https://lore.kernel.org/r/20230314205844.313519-1-bvanassche@acm.org
Reviewed-by: Avri Altman <avri.altman@wdc.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>

diff --git a/drivers/ufs/core/ufshcd.c b/drivers/ufs/core/ufshcd.c
index ce7b765aa2afa065ac8ea7c03dcf31560c7a926b..7bbbae9c7c6112db9524f82fc9b6e31e223da84d 100644 (file)
--- a/drivers/ufs/core/ufshcd.c
+++ b/drivers/ufs/core/ufshcd.c
@@ -5238,6 +5238,9 @@ ufshcd_transfer_rsp_status(struct ufs_hba *hba, struct ufshcd_lrb *lrbp,
        int scsi_status;
        enum utp_ocs ocs;
 
+       scsi_set_resid(lrbp->cmd,
+               be32_to_cpu(lrbp->ucd_rsp_ptr->sr.residual_transfer_count));
+
        /* overall command status of utrd */
        ocs = ufshcd_get_tr_ocs(lrbp, cqe);