1 files changed, 10 insertions, 4 deletions

diff --git a/drivers/md/bcache/super.c b/drivers/md/bcache/super.c
index 95a4ca6ce6ff..849ad441cd76 100644
--- a/drivers/md/bcache/super.c
+++ b/drivers/md/bcache/super.c
@@ -760,7 +760,8 @@ static int bcache_device_init(struct bcache_device *d, unsigned block_size,
         if (!d->nr_stripes ||
             d->nr_stripes > INT_MAX ||
             d->nr_stripes > SIZE_MAX / sizeof(atomic_t)) {
-                pr_err("nr_stripes too large");
+                pr_err("nr_stripes too large or invalid: %u (start sector beyond end of disk?)",
+                        (unsigned)d->nr_stripes);
                 return -ENOMEM;
         }
 
@@ -1820,7 +1821,7 @@ static int cache_alloc(struct cache *ca)
         free = roundup_pow_of_two(ca->sb.nbuckets) >> 10;
 
         if (!init_fifo(&ca->free[RESERVE_BTREE], 8, GFP_KERNEL) ||
-            !init_fifo(&ca->free[RESERVE_PRIO], prio_buckets(ca), GFP_KERNEL) ||
+            !init_fifo_exact(&ca->free[RESERVE_PRIO], prio_buckets(ca), GFP_KERNEL) ||
             !init_fifo(&ca->free[RESERVE_MOVINGGC], free, GFP_KERNEL) ||
             !init_fifo(&ca->free[RESERVE_NONE], free, GFP_KERNEL) ||
             !init_fifo(&ca->free_inc,   free << 2, GFP_KERNEL) ||
@@ -1844,7 +1845,7 @@ static int register_cache(struct cache_sb *sb, struct page *sb_page,
                                 struct block_device *bdev, struct cache *ca)
 {
         char name[BDEVNAME_SIZE];
-        const char *err = NULL;
+        const char *err = NULL; /* must be set for any error case */
         int ret = 0;
 
         memcpy(&ca->sb, sb, sizeof(struct cache_sb));
@@ -1861,8 +1862,13 @@ static int register_cache(struct cache_sb *sb, struct page *sb_page,
                 ca->discard = CACHE_DISCARD(&ca->sb);
 
         ret = cache_alloc(ca);
-        if (ret != 0)
+        if (ret != 0) {
+                if (ret == -ENOMEM)
+                        err = "cache_alloc(): -ENOMEM";
+                else
+                        err = "cache_alloc(): unknown error";
                 goto err;
+        }
 
         if (kobject_add(&ca->kobj, &part_to_dev(bdev->bd_part)->kobj, "bcache")) {
                 err = "error calling kobject_add";