linux-kernel - [PATCH 9/9] tcm_qla2xxx: Add special case for COMPARE_AND_WRITE data

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Date:	Tue, 20 Aug 2013 20:08:00 +0000
From:	"Nicholas A. Bellinger" <nab@...erainc.com>
To:	target-devel <target-devel@...r.kernel.org>
Cc:	lkml <linux-kernel@...r.kernel.org>,
	linux-scsi <linux-scsi@...r.kernel.org>,
	Christoph Hellwig <hch@....de>, Hannes Reinecke <hare@...e.de>,
	Martin Petersen <martin.petersen@...cle.com>,
	Chris Mason <chris.mason@...ionio.com>,
	James Bottomley <JBottomley@...allels.com>,
	Nicholas Bellinger <nab@...ux-iscsi.org>,
	Nicholas Bellinger <nab@...erainc.com>,
	Giridhar Malavali <giridhar.malavali@...gic.com>,
	Chad Dupuis <chad.dupuis@...gic.com>
Subject: [PATCH 9/9] tcm_qla2xxx: Add special case for COMPARE_AND_WRITE data_direction

From: Nicholas Bellinger <nab@...erainc.com>

Add a special case for COMPARE_AND_WRITE for the reverse data direction
mapping used for pci_map_sg() + friends.

Cc: Christoph Hellwig <hch@....de>
Cc: Giridhar Malavali <giridhar.malavali@...gic.com>
Cc: Chad Dupuis <chad.dupuis@...gic.com>
Cc: Hannes Reinecke <hare@...e.de>
Cc: Martin Petersen <martin.petersen@...cle.com>
Cc: Chris Mason <chris.mason@...ionio.com>
Cc: James Bottomley <JBottomley@...allels.com>
Signed-off-by: Nicholas Bellinger <nab@...erainc.com>
---
 drivers/scsi/qla2xxx/tcm_qla2xxx.c |    9 +++++++--
 1 file changed, 7 insertions(+), 2 deletions(-)

diff --git a/drivers/scsi/qla2xxx/tcm_qla2xxx.c b/drivers/scsi/qla2xxx/tcm_qla2xxx.c
index 6a93a91..4e20d51 100644
--- a/drivers/scsi/qla2xxx/tcm_qla2xxx.c
+++ b/drivers/scsi/qla2xxx/tcm_qla2xxx.c
@@ -508,8 +508,13 @@ static u32 tcm_qla2xxx_sess_get_index(struct se_session *se_sess)
  */
 static enum dma_data_direction tcm_qla2xxx_mapping_dir(struct se_cmd *se_cmd)
 {
-	if (se_cmd->se_cmd_flags & SCF_BIDI)
-		return DMA_BIDIRECTIONAL;
+	if (se_cmd->se_cmd_flags & SCF_BIDI) {
+		/*
+		 * Special fall-through case for COMPARE_AND_WRITE
+		 */
+		if (se_cmd->t_task_cdb[0] != COMPARE_AND_WRITE)
+			return DMA_BIDIRECTIONAL;
+	}
 
 	switch (se_cmd->data_direction) {
 	case DMA_TO_DEVICE:
-- 
1.7.10.4

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