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Subject[PATCH v4 2/3] scsi: ufs: Allow reading descriptor via raw upiu
Date
Allow to read descriptors via raw upiu. This in fact was forbidden just
as a precaution, as ufs-bsg actually enforces which functionality is
supported.

Signed-off-by: Avri Altman <avri.altman@wdc.com>
Reviewed-by: Evan Green <evgreen@chromium.org>
---
drivers/scsi/ufs/ufshcd.c | 20 ++++++++++++++------
1 file changed, 14 insertions(+), 6 deletions(-)

diff --git a/drivers/scsi/ufs/ufshcd.c b/drivers/scsi/ufs/ufshcd.c
index 2ddf244..6b9ed21 100644
--- a/drivers/scsi/ufs/ufshcd.c
+++ b/drivers/scsi/ufs/ufshcd.c
@@ -5775,6 +5775,20 @@ static int ufshcd_issue_devman_upiu_cmd(struct ufs_hba *hba,

/* just copy the upiu response as it is */
memcpy(rsp_upiu, lrbp->ucd_rsp_ptr, sizeof(*rsp_upiu));
+ if (desc_buff && desc_op == UPIU_QUERY_OPCODE_READ_DESC) {
+ u8 *descp = (u8 *)lrbp->ucd_rsp_ptr + sizeof(*rsp_upiu);
+ u16 resp_len = be32_to_cpu(lrbp->ucd_rsp_ptr->header.dword_2) &
+ MASK_QUERY_DATA_SEG_LEN;
+
+ if (*buff_len >= resp_len) {
+ memcpy(desc_buff, descp, resp_len);
+ *buff_len = resp_len;
+ } else {
+ dev_warn(hba->dev, "rsp size is bigger than buffer");
+ *buff_len = 0;
+ err = -EINVAL;
+ }
+ }

ufshcd_put_dev_cmd_tag(hba, tag);
wake_up(&hba->dev_cmd.tag_wq);
@@ -5810,11 +5824,6 @@ int ufshcd_exec_raw_upiu_cmd(struct ufs_hba *hba,
int ocs_value;
u8 tm_f = be32_to_cpu(req_upiu->header.dword_1) >> 16 & MASK_TM_FUNC;

- if (desc_buff && desc_op != UPIU_QUERY_OPCODE_WRITE_DESC) {
- err = -ENOTSUPP;
- goto out;
- }
-
switch (msgcode) {
case UPIU_TRANSACTION_NOP_OUT:
cmd_type = DEV_CMD_TYPE_NOP;
@@ -5855,7 +5864,6 @@ int ufshcd_exec_raw_upiu_cmd(struct ufs_hba *hba,
break;
}

-out:
return err;
}

--
1.9.1
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