UBI: fix debugging stuff

Do not check volumes which are currently in use because thay may be
in inconsistent state.

Signed-off-by: Artem Bityutskiy <Artem.Bityutskiy@nokia.com>

1 files changed, 16 insertions, 4 deletions

diff --git a/drivers/mtd/ubi/vmt.c b/drivers/mtd/ubi/vmt.c
index a0c6e1e6d4..d62dac90e1 100644
--- a/drivers/mtd/ubi/vmt.c
+++ b/drivers/mtd/ubi/vmt.c
@@ -644,21 +644,33 @@ void ubi_free_volume(struct ubi_device *ubi, int vol_id)
  * @ubi: UBI device description object
  * @vol_id: volume ID
  */
-static void paranoid_check_volume(const struct ubi_device *ubi, int vol_id)
+static void paranoid_check_volume(struct ubi_device *ubi, int vol_id)
 {
         int idx = vol_id2idx(ubi, vol_id);
         int reserved_pebs, alignment, data_pad, vol_type, name_len, upd_marker;
-        const struct ubi_volume *vol = ubi->volumes[idx];
+        const struct ubi_volume *vol;
         long long n;
         const char *name;
 
+        spin_lock(&ubi->volumes_lock);
         reserved_pebs = be32_to_cpu(ubi->vtbl[vol_id].reserved_pebs);
+        vol = ubi->volumes[idx];
 
         if (!vol) {
                 if (reserved_pebs) {
                         ubi_err("no volume info, but volume exists");
                         goto fail;
                 }
+                spin_unlock(&ubi->volumes_lock);
+                return;
+        }
+
+        if (vol->exclusive) {
+                /*
+                 * The volume may be being created at the moment, do not check
+                 * it (e.g., it may be in the middle of ubi_create_volume().
+                 */
+                spin_unlock(&ubi->volumes_lock);
                 return;
         }
 
@@ -783,12 +795,14 @@ static void paranoid_check_volume(const struct ubi_device *ubi, int vol_id)
                 goto fail;
         }
 
+        spin_unlock(&ubi->volumes_lock);
         return;
 
 fail:
         ubi_err("paranoid check failed for volume %d", vol_id);
         ubi_dbg_dump_vol_info(vol);
         ubi_dbg_dump_vtbl_record(&ubi->vtbl[vol_id], vol_id);
+        spin_unlock(&ubi->volumes_lock);
         BUG();
 }
 
@@ -801,10 +815,8 @@ static void paranoid_check_volumes(struct ubi_device *ubi)
         int i;
 
         mutex_lock(&ubi->vtbl_mutex);
-        spin_lock(&ubi->volumes_lock);
         for (i = 0; i < ubi->vtbl_slots; i++)
                 paranoid_check_volume(ubi, i);
-        spin_unlock(&ubi->volumes_lock);
         mutex_unlock(&ubi->vtbl_mutex);
 }
 #endif