From mboxrd@z Thu Jan 1 00:00:00 1970 From: "Nicholas A. Bellinger" Subject: [PATCH 9/9] tcm_qla2xxx: Add special case for COMPARE_AND_WRITE data_direction Date: Tue, 20 Aug 2013 20:08:00 +0000 Message-ID: <1377029280-19144-10-git-send-email-nab@daterainc.com> References: <1377029280-19144-1-git-send-email-nab@daterainc.com> Return-path: In-Reply-To: <1377029280-19144-1-git-send-email-nab@daterainc.com> Sender: target-devel-owner@vger.kernel.org To: target-devel Cc: lkml , linux-scsi , Christoph Hellwig , Hannes Reinecke , Martin Petersen , Chris Mason , James Bottomley , Nicholas Bellinger , Nicholas Bellinger , Giridhar Malavali , Chad Dupuis List-Id: linux-scsi@vger.kernel.org From: Nicholas Bellinger Add a special case for COMPARE_AND_WRITE for the reverse data direction mapping used for pci_map_sg() + friends. Cc: Christoph Hellwig Cc: Giridhar Malavali Cc: Chad Dupuis Cc: Hannes Reinecke Cc: Martin Petersen Cc: Chris Mason Cc: James Bottomley Signed-off-by: Nicholas Bellinger --- 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