From: Nicholas Bellinger <[email protected]> Add a special case for COMPARE_AND_WRITE for the reverse data direction mapping used for pci_map_sg() + friends.
Cc: Christoph Hellwig <[email protected]> Cc: Giridhar Malavali <[email protected]> Cc: Chad Dupuis <[email protected]> Cc: Hannes Reinecke <[email protected]> Cc: Martin Petersen <[email protected]> Cc: Chris Mason <[email protected]> Cc: James Bottomley <[email protected]> Signed-off-by: Nicholas Bellinger <[email protected]> --- 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 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
