md: remove MD_BUG()

Most of the places that call this are doing so pointlessly.
A couple of the others a best replaced with WARN_ON().

Signed-off-by: NeilBrown <neilb@suse.de>

1 files changed, 12 insertions, 46 deletions

diff --git a/drivers/md/md.c b/drivers/md/md.c
index 7da2fb3802e3..9c33f052c848 100644
--- a/drivers/md/md.c
+++ b/drivers/md/md.c
@@ -75,8 +75,6 @@ static struct workqueue_struct *md_misc_wq;
 static int remove_and_add_spares(struct mddev *mddev,
                                  struct md_rdev *this);
 
-#define MD_BUG(x...) { printk("md: bug in file %s, line %d\n", __FILE__, __LINE__); md_print_devices(); }
-
 /*
  * Default number of read corrections we'll attempt on an rdev
  * before ejecting it from the array. We divide the read error
@@ -682,9 +680,6 @@ static inline sector_t calc_dev_sboffset(struct md_rdev *rdev)
 
 static int alloc_disk_sb(struct md_rdev *rdev)
 {
-        if (rdev->sb_page)
-                MD_BUG();
-
         rdev->sb_page = alloc_page(GFP_KERNEL);
         if (!rdev->sb_page) {
                 printk(KERN_ALERT "md: out of memory.\n");
@@ -784,10 +779,7 @@ EXPORT_SYMBOL_GPL(sync_page_io);
 static int read_disk_sb(struct md_rdev *rdev, int size)
 {
         char b[BDEVNAME_SIZE];
-        if (!rdev->sb_page) {
-                MD_BUG();
-                return -EINVAL;
-        }
+
         if (rdev->sb_loaded)
                 return 0;
 
@@ -2014,11 +2006,6 @@ static int bind_rdev_to_array(struct md_rdev *rdev, struct mddev *mddev)
         char *s;
         int err;
 
-        if (rdev->mddev) {
-                MD_BUG();
-                return -EINVAL;
-        }
-
         /* prevent duplicates */
         if (find_rdev(mddev, rdev->bdev->bd_dev))
                 return -EEXIST;
@@ -2100,10 +2087,7 @@ static void md_delayed_delete(struct work_struct *ws)
 static void unbind_rdev_from_array(struct md_rdev *rdev)
 {
         char b[BDEVNAME_SIZE];
-        if (!rdev->mddev) {
-                MD_BUG();
-                return;
-        }
+
         bd_unlink_disk_holder(rdev->bdev, rdev->mddev->gendisk);
         list_del_rcu(&rdev->same_set);
         printk(KERN_INFO "md: unbind<%s>\n", bdevname(rdev->bdev,b));
@@ -2148,8 +2132,6 @@ static void unlock_rdev(struct md_rdev *rdev)
 {
         struct block_device *bdev = rdev->bdev;
         rdev->bdev = NULL;
-        if (!bdev)
-                MD_BUG();
         blkdev_put(bdev, FMODE_READ|FMODE_WRITE|FMODE_EXCL);
 }
 
@@ -2158,10 +2140,9 @@ void md_autodetect_dev(dev_t dev);
 static void export_rdev(struct md_rdev *rdev)
 {
         char b[BDEVNAME_SIZE];
+
         printk(KERN_INFO "md: export_rdev(%s)\n",
                 bdevname(rdev->bdev,b));
-        if (rdev->mddev)
-                MD_BUG();
         md_rdev_clear(rdev);
 #ifndef MODULE
         if (test_bit(AutoDetected, &rdev->flags))
@@ -2427,15 +2408,12 @@ repeat:
                 mddev->can_decrease_events = nospares;
         }
 
-        if (!mddev->events) {
-                /*
-                 * oops, this 64-bit counter should never wrap.
-                 * Either we are in around ~1 trillion A.C., assuming
-                 * 1 reboot per second, or we have a bug:
-                 */
-                MD_BUG();
-                mddev->events --;
-        }
+        /*
+         * This 64-bit counter should never wrap.
+         * Either we are in around ~1 trillion A.C., assuming
+         * 1 reboot per second, or we have a bug...
+         */
+        WARN_ON(mddev->events == 0);
 
         rdev_for_each(rdev, mddev) {
                 if (rdev->badblocks.changed)
@@ -6806,11 +6784,6 @@ void md_unregister_thread(struct md_thread **threadp)
 
 void md_error(struct mddev *mddev, struct md_rdev *rdev)
 {
-        if (!mddev) {
-                MD_BUG();
-                return;
-        }
-
         if (!rdev || test_bit(Faulty, &rdev->flags))
                 return;
 
@@ -6869,13 +6842,7 @@ static void status_resync(struct seq_file *seq, struct mddev *mddev)
         else
                 max_sectors = mddev->dev_sectors;
 
-        /*
-         * Should not happen.
-         */
-        if (!max_sectors) {
-                MD_BUG();
-                return;
-        }
+        WARN_ON(max_sectors == 0);
         /* Pick 'scale' such that (resync>>scale)*1000 will fit
          * in a sector_t, and (max_sectors>>scale) will fit in a
          * u32, as those are the requirements for sector_div.
@@ -8627,10 +8594,9 @@ static void autostart_arrays(int part)
                 if (IS_ERR(rdev))
                         continue;
 
-                if (test_bit(Faulty, &rdev->flags)) {
-                        MD_BUG();
+                if (test_bit(Faulty, &rdev->flags))
                         continue;
-                }
+
                 set_bit(AutoDetected, &rdev->flags);
                 list_add(&rdev->same_set, &pending_raid_disks);
                 i_passed++;