linux-kernel - [PATCH] UFS: Date Segment only need for WRITE DESCRIPTOR

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Date:   Thu, 25 Aug 2016 16:49:12 +0800
From:   Zang Leigang <zangleigang@...ilicon.com>
To:     <vinholikatti@...il.com>, <jejb@...ux.vnet.ibm.com>,
        <martin.petersen@...cle.com>, <linux-scsi@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>
Subject: [PATCH] UFS: Date Segment only need for WRITE DESCRIPTOR

Some device may cause a compatibility issue while receiving a Query UPIU
with Data Segment which does not expected.

Signed-off-by: Zang Leigang <zangleigang@...ilicon.com>
---
 drivers/scsi/ufs/ufshcd.c | 9 ++++++---
 1 file changed, 6 insertions(+), 3 deletions(-)

diff --git a/drivers/scsi/ufs/ufshcd.c b/drivers/scsi/ufs/ufshcd.c
index f08d41a..7292333 100644
--- a/drivers/scsi/ufs/ufshcd.c
+++ b/drivers/scsi/ufs/ufshcd.c
@@ -1266,9 +1266,12 @@ static void ufshcd_prepare_utp_query_req_upiu(struct ufs_hba *hba,
 	ucd_req_ptr->header.dword_1 = UPIU_HEADER_DWORD(
 			0, query->request.query_func, 0, 0);
 
-	/* Data segment length */
-	ucd_req_ptr->header.dword_2 = UPIU_HEADER_DWORD(
-			0, 0, len >> 8, (u8)len);
+	/* Data segment length only need for WRITE_DESC */
+	if (query->request.upiu_req.opcode == UPIU_QUERY_OPCODE_WRITE)
+		ucd_req_ptr->header.dword_2 =
+			UPIU_HEADER_DWORD(0, 0, (len >> 8), (u8)len);
+	else
+		ucd_req_ptr->header.dword_2 = 0;
 
 	/* Copy the Query Request buffer as is */
 	memcpy(&ucd_req_ptr->qr, &query->request.upiu_req,
-- 
2.9.3