[SCSI] turn most scsi semaphores into mutexes

the scsi layer is using semaphores in a mutex way, this patch converts
these into using mutexes instead

Signed-off-by: Arjan van de Ven <arjan@infradead.org>
Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>

drivers/scsi/scsi_scan.c

@@ -1289,14 +1289,14 @@ struct scsi_device *__scsi_add_device(struct Scsi_Host *shost, uint channel,
 		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);
 
@@ -1404,10 +1404,10 @@ 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);
 
@@ -1454,7 +1454,7 @@ 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;
@@ -1464,7 +1464,7 @@ 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;
 }
@@ -1522,7 +1522,7 @@ 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);
@@ -1536,7 +1536,7 @@ 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);