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authorBart Van Assche <bvanassche@acm.org>2019-04-17 14:44:32 -0700
committerMartin K. Petersen <martin.petersen@oracle.com>2019-04-29 17:24:50 -0400
commit1b1e68d2a940827725dbf666dd3e73ff12434b0c (patch)
tree277ba0ac7aa13a1b340110379c26be9cd906ed84 /drivers/scsi
parent4c374596d7eb80a901c8adc532ae9760e9df9fde (diff)
downloadlinux-1b1e68d2a940827725dbf666dd3e73ff12434b0c.tar.gz
scsi: qla2xxx: Remove unnecessary locking from the target code
All callbacks from the target core into the qla2xxx driver and also all I/O completion functions are serialized per command. Since .cmd_sent_to_fw and .trc_flags are only modified from inside these functions it is not necessary to protect it with locking. Remove the superfluous locking. Cc: Himanshu Madhani <hmadhani@marvell.com> Cc: Giridhar Malavali <gmalavali@marvell.com> Signed-off-by: Bart Van Assche <bvanassche@acm.org> Acked-by: Himanshu Madhani <hmadhani@marvell.com> Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
Diffstat (limited to 'drivers/scsi')
-rw-r--r--drivers/scsi/qla2xxx/qla_target.c4
-rw-r--r--drivers/scsi/qla2xxx/tcm_qla2xxx.c10
2 files changed, 1 insertions, 13 deletions
diff --git a/drivers/scsi/qla2xxx/qla_target.c b/drivers/scsi/qla2xxx/qla_target.c
index 2a021548162f..dfacc42f1e1d 100644
--- a/drivers/scsi/qla2xxx/qla_target.c
+++ b/drivers/scsi/qla2xxx/qla_target.c
@@ -3387,9 +3387,7 @@ int qlt_xmit_response(struct qla_tgt_cmd *cmd, int xmit_type,
cmd->state = QLA_TGT_STATE_PROCESSED; /* Mid-level is done processing */
- spin_lock(&cmd->cmd_lock);
cmd->cmd_sent_to_fw = 1;
- spin_unlock(&cmd->cmd_lock);
cmd->ctio_flags = le16_to_cpu(pkt->u.status0.flags);
/* Memory Barrier */
@@ -3470,9 +3468,7 @@ int qlt_rdy_to_xfer(struct qla_tgt_cmd *cmd)
qlt_load_data_segments(&prm);
cmd->state = QLA_TGT_STATE_NEED_DATA;
- spin_lock(&cmd->cmd_lock);
cmd->cmd_sent_to_fw = 1;
- spin_unlock(&cmd->cmd_lock);
cmd->ctio_flags = le16_to_cpu(pkt->u.status0.flags);
/* Memory Barrier */
diff --git a/drivers/scsi/qla2xxx/tcm_qla2xxx.c b/drivers/scsi/qla2xxx/tcm_qla2xxx.c
index 701e8f891af5..ffcfca1e94b4 100644
--- a/drivers/scsi/qla2xxx/tcm_qla2xxx.c
+++ b/drivers/scsi/qla2xxx/tcm_qla2xxx.c
@@ -261,17 +261,15 @@ static void tcm_qla2xxx_free_mcmd(struct qla_tgt_mgmt_cmd *mcmd)
static void tcm_qla2xxx_complete_free(struct work_struct *work)
{
struct qla_tgt_cmd *cmd = container_of(work, struct qla_tgt_cmd, work);
- unsigned long flags;
cmd->cmd_in_wq = 0;
WARN_ON(cmd->trc_flags & TRC_CMD_FREE);
- spin_lock_irqsave(&cmd->cmd_lock, flags);
+ /* To do: protect all tgt_counters manipulations with proper locking. */
cmd->qpair->tgt_counters.qla_core_ret_sta_ctio++;
cmd->trc_flags |= TRC_CMD_FREE;
cmd->cmd_sent_to_fw = 0;
- spin_unlock_irqrestore(&cmd->cmd_lock, flags);
transport_generic_free_cmd(&cmd->se_cmd, 0);
}
@@ -473,24 +471,18 @@ static int tcm_qla2xxx_handle_cmd(scsi_qla_host_t *vha, struct qla_tgt_cmd *cmd,
static void tcm_qla2xxx_handle_data_work(struct work_struct *work)
{
struct qla_tgt_cmd *cmd = container_of(work, struct qla_tgt_cmd, work);
- unsigned long flags;
/*
* Ensure that the complete FCP WRITE payload has been received.
* Otherwise return an exception via CHECK_CONDITION status.
*/
cmd->cmd_in_wq = 0;
-
- spin_lock_irqsave(&cmd->cmd_lock, flags);
cmd->cmd_sent_to_fw = 0;
if (cmd->aborted) {
- spin_unlock_irqrestore(&cmd->cmd_lock, flags);
-
transport_generic_request_failure(&cmd->se_cmd,
TCM_CHECK_CONDITION_ABORT_CMD);
return;
}
- spin_unlock_irqrestore(&cmd->cmd_lock, flags);
cmd->qpair->tgt_counters.qla_core_ret_ctio++;
if (!cmd->write_data_transferred) {