[PATCH v3 02/15] qla2xxx: Replace usage of spin_lock with spin_lock_irqsave

[Himanshu Madhani]

From: Quinn Tran <quinn.t...@cavium.com>

Convert usage of spin_lock to spin_lock_irqsave because qla2xxx driver
can access all the data structures in an interrupt context.

Signed-off-by: Quinn Tran <quinn.t...@cavium.com>
Signed-off-by: Himanshu Madhani <himanshu.madh...@cavium.com>
Reviewed-by: Bart Van Assche <bart.vanass...@sandisk.com>
---
 drivers/scsi/qla2xxx/qla_target.c | 26 ++++++++++++++------------
 1 file changed, 14 insertions(+), 12 deletions(-)

diff --git a/drivers/scsi/qla2xxx/qla_target.c 
b/drivers/scsi/qla2xxx/qla_target.c
index e766d8412384..a2e17a5794ab 100644
--- a/drivers/scsi/qla2xxx/qla_target.c
+++ b/drivers/scsi/qla2xxx/qla_target.c
@@ -1762,13 +1762,13 @@ static int abort_cmd_for_tag(struct scsi_qla_host *vha, 
uint32_t tag)
 {
        struct qla_tgt_sess_op *op;
        struct qla_tgt_cmd *cmd;
+       unsigned long flags;
 
-       spin_lock(&vha->cmd_list_lock);
-
+       spin_lock_irqsave(&vha->cmd_list_lock, flags);
        list_for_each_entry(op, &vha->qla_sess_op_cmd_list, cmd_list) {
                if (tag == op->atio.u.isp24.exchange_addr) {
                        op->aborted = true;
-                       spin_unlock(&vha->cmd_list_lock);
+                       spin_unlock_irqrestore(&vha->cmd_list_lock, flags);
                        return 1;
                }
        }
@@ -1776,7 +1776,7 @@ static int abort_cmd_for_tag(struct scsi_qla_host *vha, 
uint32_t tag)
        list_for_each_entry(op, &vha->unknown_atio_list, cmd_list) {
                if (tag == op->atio.u.isp24.exchange_addr) {
                        op->aborted = true;
-                       spin_unlock(&vha->cmd_list_lock);
+                       spin_unlock_irqrestore(&vha->cmd_list_lock, flags);
                        return 1;
                }
        }
@@ -1784,12 +1784,12 @@ static int abort_cmd_for_tag(struct scsi_qla_host *vha, 
uint32_t tag)
        list_for_each_entry(cmd, &vha->qla_cmd_list, cmd_list) {
                if (tag == cmd->atio.u.isp24.exchange_addr) {
                        cmd->aborted = 1;
-                       spin_unlock(&vha->cmd_list_lock);
+                       spin_unlock_irqrestore(&vha->cmd_list_lock, flags);
                        return 1;
                }
        }
+       spin_unlock_irqrestore(&vha->cmd_list_lock, flags);
 
-       spin_unlock(&vha->cmd_list_lock);
        return 0;
 }
 
@@ -1804,9 +1804,10 @@ static void abort_cmds_for_lun(struct scsi_qla_host *vha,
        struct qla_tgt_sess_op *op;
        struct qla_tgt_cmd *cmd;
        uint32_t key;
+       unsigned long flags;
 
        key = sid_to_key(s_id);
-       spin_lock(&vha->cmd_list_lock);
+       spin_lock_irqsave(&vha->cmd_list_lock, flags);
        list_for_each_entry(op, &vha->qla_sess_op_cmd_list, cmd_list) {
                uint32_t op_key;
                uint32_t op_lun;
@@ -1839,7 +1840,7 @@ static void abort_cmds_for_lun(struct scsi_qla_host *vha,
                if (cmd_key == key && cmd_lun == lun)
                        cmd->aborted = 1;
        }
-       spin_unlock(&vha->cmd_list_lock);
+       spin_unlock_irqrestore(&vha->cmd_list_lock, flags);
 }
 
 /* ha->hardware_lock supposed to be held on entry */
@@ -4216,9 +4217,9 @@ static int qlt_handle_cmd_for_atio(struct scsi_qla_host 
*vha,
                memcpy(&op->atio, atio, sizeof(*atio));
                op->vha = vha;
 
-               spin_lock(&vha->cmd_list_lock);
+               spin_lock_irqsave(&vha->cmd_list_lock, flags);
                list_add_tail(&op->cmd_list, &vha->qla_sess_op_cmd_list);
-               spin_unlock(&vha->cmd_list_lock);
+               spin_unlock_irqrestore(&vha->cmd_list_lock, flags);
 
                INIT_WORK(&op->work, qlt_create_sess_from_atio);
                queue_work(qla_tgt_wq, &op->work);
@@ -4529,12 +4530,13 @@ static int abort_cmds_for_s_id(struct scsi_qla_host 
*vha, port_id_t *s_id)
        struct qla_tgt_cmd *cmd;
        uint32_t key;
        int count = 0;
+       unsigned long flags;
 
        key = (((u32)s_id->b.domain << 16) |
               ((u32)s_id->b.area   <<  8) |
               ((u32)s_id->b.al_pa));
 
-       spin_lock(&vha->cmd_list_lock);
+       spin_lock_irqsave(&vha->cmd_list_lock, flags);
        list_for_each_entry(op, &vha->qla_sess_op_cmd_list, cmd_list) {
                uint32_t op_key = sid_to_key(op->atio.u.isp24.fcp_hdr.s_id);
 
@@ -4559,7 +4561,7 @@ static int abort_cmds_for_s_id(struct scsi_qla_host *vha, 
port_id_t *s_id)
                        count++;
                }
        }
-       spin_unlock(&vha->cmd_list_lock);
+       spin_unlock_irqrestore(&vha->cmd_list_lock, flags);
 
        return count;
 }
-- 
2.12.0