Messages in this thread Patch in this message | | | 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 |
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From: Nicholas Bellinger <nab@daterainc.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@lst.de> Cc: Giridhar Malavali <giridhar.malavali@qlogic.com> Cc: Chad Dupuis <chad.dupuis@qlogic.com> Cc: Hannes Reinecke <hare@suse.de> Cc: Martin Petersen <martin.petersen@oracle.com> Cc: Chris Mason <chris.mason@fusionio.com> Cc: James Bottomley <JBottomley@Parallels.com> Signed-off-by: Nicholas Bellinger <nab@daterainc.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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