linux-kernel - Re: [PATCH] xfs: handle register

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Date:   Thu, 23 Nov 2017 17:11:37 +0100
From:   Michal Hocko <mhocko@...nel.org>
To:     Tetsuo Handa <penguin-kernel@...ove.SAKURA.ne.jp>
Cc:     hch@...radead.org, darrick.wong@...cle.com, david@...morbit.com,
        linux-xfs@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] xfs: handle register_shrinker error

On Fri 24-11-17 01:01:10, Tetsuo Handa wrote:
> Michal Hocko wrote:
> > On Thu 23-11-17 05:26:33, Christoph Hellwig wrote:
> > > Looks good,
> > > 
> > > Reviewed-by: Christoph Hellwig <hch@....de>
> > 
> > Thanks!
> > 
> > > I can take a stab at the quota one.
> > 
> > That would be really great!
> > 
> Again, it does not look good. Since kmem_free() does only kvfree(),
> nothing will release memory allocated by list_lru_init().

Hmm, you are right. I have (blindly) followed the current code flow
which is wrong as well. The following should do the trick. Should I
split that into two patches?
---
diff --git a/fs/xfs/xfs_buf.c b/fs/xfs/xfs_buf.c
index dd0e18af990c..4c6e86d861fd 100644
--- a/fs/xfs/xfs_buf.c
+++ b/fs/xfs/xfs_buf.c
@@ -1815,25 +1815,27 @@ xfs_alloc_buftarg(
 	btp->bt_daxdev = dax_dev;
 
 	if (xfs_setsize_buftarg_early(btp, bdev))
-		goto error;
+		goto error_free;
 
 	if (list_lru_init(&btp->bt_lru))
-		goto error;
+		goto error_free;
 
 	if (percpu_counter_init(&btp->bt_io_count, 0, GFP_KERNEL))
-		goto error;
+		goto error_lru;
 
 	btp->bt_shrinker.count_objects = xfs_buftarg_shrink_count;
 	btp->bt_shrinker.scan_objects = xfs_buftarg_shrink_scan;
 	btp->bt_shrinker.seeks = DEFAULT_SEEKS;
 	btp->bt_shrinker.flags = SHRINKER_NUMA_AWARE;
-	if (register_shrinker(&btp->bt_shrinker)) {
-		percpu_counter_destroy(&btp->bt_io_count);
-		goto error;
-	}
+	if (register_shrinker(&btp->bt_shrinker))
+		goto error_pcpu;
 	return btp;
 
-error:
+error_pcpu:
+	percpu_counter_destroy(&btp->bt_io_count);
+error_lru:
+	list_lru_destroy(&btp->bt_lru);
+error_free:
 	kmem_free(btp);
 	return NULL;
 }

-- 
Michal Hocko
SUSE Labs