[SCSI] fix wrong context bugs in SCSI

There's a bug in releasing scsi_device where the release function
actually frees the block queue. However, the block queue release
calls flush_work(), which requires process context (the scsi_device
structure may release from irq context). Update the release function
to invoke via the execute_in_process_context() API.

Also clean up the scsi_target structure releasing via this API.

Signed-off-by: James Bottomley <[e-mail]>

drivers/scsi/scsi_scan.c

···
 	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;
+static void scsi_target_reap_usercontext(void *data)
+{
+	struct scsi_target *starget = data;
 	struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
 	unsigned long flags;
-
-	kfree(wqw);
 
 	spin_lock_irqsave(shost->host_lock, flags);
 
···
  */
 void scsi_target_reap(struct scsi_target *starget)
 {
-	struct work_queue_wrapper *wqw = 
-		kzalloc(sizeof(struct work_queue_wrapper), GFP_ATOMIC);
-
-	if (!wqw) {
-		starget_printk(KERN_ERR, starget,
-			       "Failed to allocate memory in scsi_reap_target()\n");
-		return;
-	}
-
-	INIT_WORK(&wqw->work, scsi_target_reap_work, wqw);
-	wqw->starget = starget;
-	schedule_work(&wqw->work);
+	scsi_execute_in_process_context(scsi_target_reap_usercontext, starget);
 }
 
 /**

drivers/scsi/scsi_sysfs.c

···
 	put_device(&sdev->sdev_gendev);
 }
 
-static void scsi_device_dev_release(struct device *dev)
+static void scsi_device_dev_release_usercontext(void *data)
 {
+	struct device *dev = data;
 	struct scsi_device *sdev;
 	struct device *parent;
 	struct scsi_target *starget;
···
 
 	if (sdev->request_queue) {
 		sdev->request_queue->queuedata = NULL;
+		/* user context needed to free queue */
 		scsi_free_queue(sdev->request_queue);
 		/* temporary expedient, try to catch use of queue lock
 		 * after free of sdev */
···
 
 	if (parent)
 		put_device(parent);
+}
+
+static void scsi_device_dev_release(struct device *dev)
+{
+	scsi_execute_in_process_context(scsi_device_dev_release_usercontext,	dev);
 }
 
 static struct class sdev_class = {