lib: percpu_counter_init error handling

alloc_percpu can fail, propagate that error.

Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 15 insertions, 6 deletions

diff --git a/fs/ext4/super.c b/fs/ext4/super.c
index 1814d4b8ff1f..157c64c9a4e7 100644
--- a/fs/ext4/super.c
+++ b/fs/ext4/super.c
@@ -1479,6 +1479,7 @@ static int ext4_fill_super (struct super_block *sb, void *data, int silent)
         int needs_recovery;
         __le32 features;
         __u64 blocks_count;
+        int err;
 
         sbi = kzalloc(sizeof(*sbi), GFP_KERNEL);
         if (!sbi)
@@ -1759,12 +1760,20 @@ static int ext4_fill_super (struct super_block *sb, void *data, int silent)
         get_random_bytes(&sbi->s_next_generation, sizeof(u32));
         spin_lock_init(&sbi->s_next_gen_lock);
 
-        percpu_counter_init(&sbi->s_freeblocks_counter,
-                ext4_count_free_blocks(sb));
-        percpu_counter_init(&sbi->s_freeinodes_counter,
-                ext4_count_free_inodes(sb));
-        percpu_counter_init(&sbi->s_dirs_counter,
-                ext4_count_dirs(sb));
+        err = percpu_counter_init(&sbi->s_freeblocks_counter,
+                        ext4_count_free_blocks(sb));
+        if (!err) {
+                err = percpu_counter_init(&sbi->s_freeinodes_counter,
+                                ext4_count_free_inodes(sb));
+        }
+        if (!err) {
+                err = percpu_counter_init(&sbi->s_dirs_counter,
+                                ext4_count_dirs(sb));
+        }
+        if (err) {
+                printk(KERN_ERR "EXT4-fs: insufficient memory\n");
+                goto failed_mount3;
+        }
 
         /* per fileystem reservation list head & lock */
         spin_lock_init(&sbi->s_rsv_window_lock);