[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>
diff --git a/drivers/scsi/scsi_sysfs.c b/drivers/scsi/scsi_sysfs.c
index ea7f3a4..2cb9627 100644
--- a/drivers/scsi/scsi_sysfs.c
+++ b/drivers/scsi/scsi_sysfs.c
@@ -745,9 +745,9 @@
 {
 	struct Scsi_Host *shost = sdev->host;
 
-	down(&shost->scan_mutex);
+	mutex_lock(&shost->scan_mutex);
 	__scsi_remove_device(sdev);
-	up(&shost->scan_mutex);
+	mutex_unlock(&shost->scan_mutex);
 }
 EXPORT_SYMBOL(scsi_remove_device);