cciss: Fix problem with remove_from_scan_list on driver unload

cciss: Fix problem with remove_from_scan_list that on driver unload
it doesn't remove the controller from the scan list correctly if
the controller is currently being scanned for new devices.

Signed-off-by: Stephen M. Cameron <scameron@beardog.cce.hp.com>
Signed-off-by: Jens Axboe <jens.axboe@oracle.com>

1 files changed, 13 insertions, 8 deletions

diff --git a/drivers/block/cciss.c b/drivers/block/cciss.c
index 92b126394fa..81c21875eb7 100644
--- a/drivers/block/cciss.c
+++ b/drivers/block/cciss.c
@@ -3513,28 +3513,33 @@ static int add_to_scan_list(struct ctlr_info *h)
  * @h:                     Pointer to the controller.
  *
  * Removes the controller from the rescan queue if present. Blocks if
- * the controller is currently conducting a rescan.
+ * the controller is currently conducting a rescan.  The controller
+ * can be in one of three states:
+ * 1. Doesn't need a scan
+ * 2. On the scan list, but not scanning yet (we remove it)
+ * 3. Busy scanning (and not on the list). In this case we want to wait for
+ *    the scan to complete to make sure the scanning thread for this
+ *    controller is completely idle.
  **/
 static void remove_from_scan_list(struct ctlr_info *h)
 {
         struct ctlr_info *test_h, *tmp_h;
-        int scanning = 0;
 
         mutex_lock(&scan_mutex);
         list_for_each_entry_safe(test_h, tmp_h, &scan_q, scan_list) {
-                if (test_h == h) {
+                if (test_h == h) { /* state 2. */
                         list_del(&h->scan_list);
                         complete_all(&h->scan_wait);
                         mutex_unlock(&scan_mutex);
                         return;
                 }
         }
-        if (&h->busy_scanning)
-                scanning = 0;
-        mutex_unlock(&scan_mutex);
-
-        if (scanning)
+        if (h->busy_scanning) { /* state 3. */
+                mutex_unlock(&scan_mutex);
                 wait_for_completion(&h->scan_wait);
+        } else { /* state 1, nothing to do. */
+                mutex_unlock(&scan_mutex);
+        }
 }
 
 /**