Revert "kernfs: fix memleak in kernel_ops_readdir()"

This reverts commit cc798c83898ea0a77fcaa1a92afda35c3c3ded74.

Tony writes:
	Somehow this causes a regression in Linux next for me where I'm
	seeing lots of sysfs entries now missing under
	/sys/bus/platform/devices.

	For example, I now only see one .serial entry show up in sysfs.
	Things work again if I revert commit cc798c83898e ("kernfs: fix
	memleak inkernel_ops_readdir()"). Any ideas why that would be?

Tejun says:
	Ugh, you're right.  It can get double-put cuz ctx->pos is put by
	release too.

So reverting it for now.

Reported-by: Tony Lindgren <tony@atomide.com>
Cc: Andrea Arcangeli <aarcange@redhat.com>
Cc: Tejun Heo <tj@kernel.org>
Fixes: cc798c83898e ("kernfs: fix memleak in kernel_ops_readdir()")
Cc: stable <stable@vger.kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/fs/kernfs/dir.c b/fs/kernfs/dir.c
index 1e98efc..a387534 100644 (file)
--- a/fs/kernfs/dir.c
+++ b/fs/kernfs/dir.c
@@ -1684,14 +1684,11 @@ static int kernfs_fop_readdir(struct file *file, struct dir_context *ctx)
                kernfs_get(pos);
 
                mutex_unlock(&kernfs_mutex);
-               if (unlikely(!dir_emit(ctx, name, len, ino, type))) {
-                       kernfs_put(pos);
-                       goto out;
-               }
+               if (!dir_emit(ctx, name, len, ino, type))
+                       return 0;
                mutex_lock(&kernfs_mutex);
        }
        mutex_unlock(&kernfs_mutex);
-out:
        file->private_data = NULL;
        ctx->pos = INT_MAX;
        return 0;