This is a note to let you know that I've just added the patch titled
scsi: ufs: Fix residual handling
to the 6.4-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
scsi-ufs-fix-residual-handling.patch
and it can be found in the queue-6.4 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit 7c3f9ee2ee6e40d27bcfd684a975f1b133699e49
Author: Bart Van Assche <bvanassche@xxxxxxx>
Date: Mon Jul 24 13:08:29 2023 -0700
scsi: ufs: Fix residual handling
[ Upstream commit 2903265e27bfc6dea915dd9e17a1b2587f621f73 ]
Only call scsi_set_resid() in case of an underflow. Do not call
scsi_set_resid() in case of an overflow.
Cc: Avri Altman <avri.altman@xxxxxxx>
Cc: Adrian Hunter <adrian.hunter@xxxxxxxxx>
Fixes: cb38845d90fc ("scsi: ufs: core: Set the residual byte count")
Signed-off-by: Bart Van Assche <bvanassche@xxxxxxx>
Link: https://lore.kernel.org/r/20230724200843.3376570-2-bvanassche@xxxxxxx
Reviewed-by: Avri Altman <avri.altman@xxxxxxx>
Reviewed-by: Adrian Hunter <adrian.hunter@xxxxxxxxx>
Signed-off-by: Martin K. Petersen <martin.petersen@xxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
diff --git a/drivers/ufs/core/ufshcd.c b/drivers/ufs/core/ufshcd.c
index 6d8ef80d9cbc4..b9177182e5a7b 100644
--- a/drivers/ufs/core/ufshcd.c
+++ b/drivers/ufs/core/ufshcd.c
@@ -5255,9 +5255,17 @@ ufshcd_transfer_rsp_status(struct ufs_hba *hba, struct ufshcd_lrb *lrbp,
int result = 0;
int scsi_status;
enum utp_ocs ocs;
+ u8 upiu_flags;
+ u32 resid;
- scsi_set_resid(lrbp->cmd,
- be32_to_cpu(lrbp->ucd_rsp_ptr->sr.residual_transfer_count));
+ upiu_flags = be32_to_cpu(lrbp->ucd_rsp_ptr->header.dword_0) >> 16;
+ resid = be32_to_cpu(lrbp->ucd_rsp_ptr->sr.residual_transfer_count);
+ /*
+ * Test !overflow instead of underflow to support UFS devices that do
+ * not set either flag.
+ */
+ if (resid && !(upiu_flags & UPIU_RSP_FLAG_OVERFLOW))
+ scsi_set_resid(lrbp->cmd, resid);
/* overall command status of utrd */
ocs = ufshcd_get_tr_ocs(lrbp, cqe);
diff --git a/include/ufs/ufs.h b/include/ufs/ufs.h
index 4e8d6240e589b..af5f5e588d5f4 100644
--- a/include/ufs/ufs.h
+++ b/include/ufs/ufs.h
@@ -102,6 +102,12 @@ enum {
UPIU_CMD_FLAGS_READ = 0x40,
};
+/* UPIU response flags */
+enum {
+ UPIU_RSP_FLAG_UNDERFLOW = 0x20,
+ UPIU_RSP_FLAG_OVERFLOW = 0x40,
+};
+
/* UPIU Task Attributes */
enum {
UPIU_TASK_ATTR_SIMPLE = 0x00,
