[SCSI] iscsi update: rm conn lock

[linux-2.6-omap-h63xx.git] / drivers / scsi / scsi_scan.c

diff --git a/drivers/scsi/scsi_scan.c b/drivers/scsi/scsi_scan.c
index 94e5167f260dbc93642b554ac2378cbc5f546908..752fb5da3de4f55e461c2b93d3e3e108a2b2a89d 100644 (file)
--- a/drivers/scsi/scsi_scan.c
+++ b/drivers/scsi/scsi_scan.c
@@ -74,7 +74,7 @@
 #define SCSI_SCAN_TARGET_PRESENT       1
 #define SCSI_SCAN_LUN_PRESENT          2
 
-static char *scsi_null_device_strs = "nullnullnullnull";
+static const char *scsi_null_device_strs = "nullnullnullnull";
 
 #define MAX_SCSI_LUNS  512
 
@@ -334,19 +334,6 @@ static struct scsi_target *scsi_alloc_target(struct device *parent,
        struct scsi_target *starget;
        struct scsi_target *found_target;
 
-       /*
-        * Obtain the real parent from the transport. The transport
-        * is allowed to fail (no error) if there is nothing at that
-        * target id.
-        */
-       if (shost->transportt->target_parent) {
-               spin_lock_irqsave(shost->host_lock, flags);
-               parent = shost->transportt->target_parent(shost, channel, id);
-               spin_unlock_irqrestore(shost->host_lock, flags);
-               if (!parent)
-                       return NULL;
-       }
-
        starget = kmalloc(size, GFP_KERNEL);
        if (!starget) {
                printk(KERN_ERR "%s: allocation failure\n", __FUNCTION__);
@@ -400,6 +387,36 @@ static struct scsi_target *scsi_alloc_target(struct device *parent,
        return found_target;
 }
 
+struct work_queue_wrapper {
+       struct work_struct      work;
+       struct scsi_target      *starget;
+};
+
+static void scsi_target_reap_work(void *data) {
+       struct work_queue_wrapper *wqw = (struct work_queue_wrapper *)data;
+       struct scsi_target *starget = wqw->starget;
+       struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
+       unsigned long flags;
+
+       kfree(wqw);
+
+       spin_lock_irqsave(shost->host_lock, flags);
+
+       if (--starget->reap_ref == 0 && list_empty(&starget->devices)) {
+               list_del_init(&starget->siblings);
+               spin_unlock_irqrestore(shost->host_lock, flags);
+               transport_remove_device(&starget->dev);
+               device_del(&starget->dev);
+               transport_destroy_device(&starget->dev);
+               put_device(&starget->dev);
+               return;
+
+       }
+       spin_unlock_irqrestore(shost->host_lock, flags);
+
+       return;
+}
+
 /**
  * scsi_target_reap - check to see if target is in use and destroy if not
  *
@@ -411,19 +428,18 @@ static struct scsi_target *scsi_alloc_target(struct device *parent,
  */
 void scsi_target_reap(struct scsi_target *starget)
 {
-       struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
-       unsigned long flags;
-       spin_lock_irqsave(shost->host_lock, flags);
+       struct work_queue_wrapper *wqw = 
+               kzalloc(sizeof(struct work_queue_wrapper), GFP_ATOMIC);
 
-       if (--starget->reap_ref == 0 && list_empty(&starget->devices)) {
-               list_del_init(&starget->siblings);
-               spin_unlock_irqrestore(shost->host_lock, flags);
-               device_del(&starget->dev);
-               transport_unregister_device(&starget->dev);
-               put_device(&starget->dev);
+       if (!wqw) {
+               starget_printk(KERN_ERR, starget,
+                              "Failed to allocate memory in scsi_reap_target()\n");
                return;
        }
-       spin_unlock_irqrestore(shost->host_lock, flags);
+
+       INIT_WORK(&wqw->work, scsi_target_reap_work, wqw);
+       wqw->starget = starget;
+       schedule_work(&wqw->work);
 }
 
 /**
@@ -1254,20 +1270,21 @@ struct scsi_device *__scsi_add_device(struct Scsi_Host *shost, uint channel,
        struct scsi_device *sdev;
        struct device *parent = &shost->shost_gendev;
        int res;
-       struct scsi_target *starget = scsi_alloc_target(parent, channel, id);
+       struct scsi_target *starget;
 
+       starget = scsi_alloc_target(parent, channel, id);
        if (!starget)
                return ERR_PTR(-ENOMEM);
 
        get_device(&starget->dev);
-       down(&shost->scan_mutex);
+       mutex_lock(&shost->scan_mutex);
        if (scsi_host_scan_allowed(shost)) {
                res = scsi_probe_and_add_lun(starget, lun, NULL, &sdev, 1,
                                             hostdata);
                if (res != SCSI_SCAN_LUN_PRESENT)
                        sdev = ERR_PTR(-ENODEV);
        }
-       up(&shost->scan_mutex);
+       mutex_unlock(&shost->scan_mutex);
        scsi_target_reap(starget);
        put_device(&starget->dev);
 
@@ -1375,10 +1392,10 @@ void scsi_scan_target(struct device *parent, unsigned int channel,
 {
        struct Scsi_Host *shost = dev_to_shost(parent);
 
-       down(&shost->scan_mutex);
+       mutex_lock(&shost->scan_mutex);
        if (scsi_host_scan_allowed(shost))
                __scsi_scan_target(parent, channel, id, lun, rescan);
-       up(&shost->scan_mutex);
+       mutex_unlock(&shost->scan_mutex);
 }
 EXPORT_SYMBOL(scsi_scan_target);
 
@@ -1425,7 +1442,7 @@ int scsi_scan_host_selected(struct Scsi_Host *shost, unsigned int channel,
            ((lun != SCAN_WILD_CARD) && (lun > shost->max_lun)))
                return -EINVAL;
 
-       down(&shost->scan_mutex);
+       mutex_lock(&shost->scan_mutex);
        if (scsi_host_scan_allowed(shost)) {
                if (channel == SCAN_WILD_CARD)
                        for (channel = 0; channel <= shost->max_channel;
@@ -1435,7 +1452,7 @@ int scsi_scan_host_selected(struct Scsi_Host *shost, unsigned int channel,
                else
                        scsi_scan_channel(shost, channel, id, lun, rescan);
        }
-       up(&shost->scan_mutex);
+       mutex_unlock(&shost->scan_mutex);
 
        return 0;
 }
@@ -1493,7 +1510,7 @@ struct scsi_device *scsi_get_host_dev(struct Scsi_Host *shost)
        struct scsi_device *sdev = NULL;
        struct scsi_target *starget;
 
-       down(&shost->scan_mutex);
+       mutex_lock(&shost->scan_mutex);
        if (!scsi_host_scan_allowed(shost))
                goto out;
        starget = scsi_alloc_target(&shost->shost_gendev, 0, shost->this_id);
@@ -1507,7 +1524,7 @@ struct scsi_device *scsi_get_host_dev(struct Scsi_Host *shost)
        }
        put_device(&starget->dev);
  out:
-       up(&shost->scan_mutex);
+       mutex_unlock(&shost->scan_mutex);
        return sdev;
 }
 EXPORT_SYMBOL(scsi_get_host_dev);