[SCSI] megaraid_sas: switch fw_outstanding to an atomic_t

[powerpc.git] / drivers / scsi / megaraid / megaraid_sas.c

diff --git a/drivers/scsi/megaraid/megaraid_sas.c b/drivers/scsi/megaraid/megaraid_sas.c
index 38ede24..0c9516f 100644 (file)
--- a/drivers/scsi/megaraid/megaraid_sas.c
+++ b/drivers/scsi/megaraid/megaraid_sas.c
@@ -741,7 +741,6 @@ static int
 megasas_queue_command(struct scsi_cmnd *scmd, void (*done) (struct scsi_cmnd *))
 {
        u32 frame_count;
-       unsigned long flags;
        struct megasas_cmd *cmd;
        struct megasas_instance *instance;
 
@@ -776,9 +775,7 @@ megasas_queue_command(struct scsi_cmnd *scmd, void (*done) (struct scsi_cmnd *))
        /*
         * Issue the command to the FW
         */
-       spin_lock_irqsave(&instance->instance_lock, flags);
-       instance->fw_outstanding++;
-       spin_unlock_irqrestore(&instance->instance_lock, flags);
+       atomic_inc(&instance->fw_outstanding);
 
        instance->instancet->fire_cmd(cmd->frame_phys_addr ,cmd->frame_count-1,instance->reg_set);
 
@@ -826,19 +823,20 @@ static int megasas_wait_for_outstanding(struct megasas_instance *instance)
 
        for (i = 0; i < wait_time; i++) {
 
-               if (!instance->fw_outstanding)
+               int outstanding = atomic_read(&instance->fw_outstanding);
+
+               if (!outstanding)
                        break;
 
                if (!(i % MEGASAS_RESET_NOTICE_INTERVAL)) {
                        printk(KERN_NOTICE "megasas: [%2d]waiting for %d "
-                              "commands to complete\n", i,
-                              instance->fw_outstanding);
+                              "commands to complete\n",i,outstanding);
                }
 
                msleep(1000);
        }
 
-       if (instance->fw_outstanding) {
+       if (atomic_read(&instance->fw_outstanding)) {
                instance->hw_crit_error = 1;
                return FAILED;
        }
@@ -902,7 +900,7 @@ static int megasas_reset_bus_host(struct scsi_cmnd *scmd)
        int ret;
 
        /*
-        * Frist wait for all commands to complete
+        * First wait for all commands to complete
         */
        ret = megasas_generic_reset(scmd);
 
@@ -1050,7 +1048,6 @@ megasas_complete_cmd(struct megasas_instance *instance, struct megasas_cmd *cmd,
 {
        int exception = 0;
        struct megasas_header *hdr = &cmd->frame->hdr;
-       unsigned long flags;
 
        if (cmd->scmd) {
                cmd->scmd->SCp.ptr = (char *)0;
@@ -1082,9 +1079,7 @@ megasas_complete_cmd(struct megasas_instance *instance, struct megasas_cmd *cmd,
 
                if (exception) {
 
-                       spin_lock_irqsave(&instance->instance_lock, flags);
-                       instance->fw_outstanding--;
-                       spin_unlock_irqrestore(&instance->instance_lock, flags);
+                       atomic_dec(&instance->fw_outstanding);
 
                        megasas_unmap_sgbuf(instance, cmd);
                        cmd->scmd->scsi_done(cmd->scmd);
@@ -1132,9 +1127,7 @@ megasas_complete_cmd(struct megasas_instance *instance, struct megasas_cmd *cmd,
                        break;
                }
 
-               spin_lock_irqsave(&instance->instance_lock, flags);
-               instance->fw_outstanding--;
-               spin_unlock_irqrestore(&instance->instance_lock, flags);
+               atomic_dec(&instance->fw_outstanding);
 
                megasas_unmap_sgbuf(instance, cmd);
                cmd->scmd->scsi_done(cmd->scmd);
@@ -2171,11 +2164,12 @@ megasas_probe_one(struct pci_dev *pdev, const struct pci_device_id *id)
         */
        INIT_LIST_HEAD(&instance->cmd_pool);
 
+       atomic_set(&instance->fw_outstanding,0);
+
        init_waitqueue_head(&instance->int_cmd_wait_q);
        init_waitqueue_head(&instance->abort_cmd_wait_q);
 
        spin_lock_init(&instance->cmd_pool_lock);
-       spin_lock_init(&instance->instance_lock);
 
        sema_init(&instance->aen_mutex, 1);
        sema_init(&instance->ioctl_sem, MEGASAS_INT_CMDS);