linux-kernel - [PATCH 3.16 245/410] IB/ipoib: Do not warn if IPoIB debugfs doesn't exist

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Date:   Thu, 07 Jun 2018 15:05:21 +0100
From:   Ben Hutchings <ben@...adent.org.uk>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
CC:     akpm@...ux-foundation.org, "Alaa Hleihel" <alaa@...lanox.com>,
        "Jason Gunthorpe" <jgg@...lanox.com>,
        "Dennis Dalessandro" <dennis.dalessandro@...el.com>,
        "Leon Romanovsky" <leon@...nel.org>
Subject: [PATCH 3.16 245/410] IB/ipoib: Do not warn if IPoIB debugfs
 doesn't exist

3.16.57-rc1 review patch.  If anyone has any objections, please let me know.

------------------

From: Alaa Hleihel <alaa@...lanox.com>

commit 14fa91e0fef8e4d6feb8b1fa2a807828e0abe815 upstream.

netdev_wait_allrefs() could rebroadcast NETDEV_UNREGISTER event
multiple times until all refs are gone, which will result in calling
ipoib_delete_debug_files multiple times and printing a warning.

Remove the WARN_ONCE since checks of NULL pointers before calling
debugfs_remove are not needed.

Fixes: 771a52584096 ("IB/IPoIB: ibX: failed to create mcg debug file")
Signed-off-by: Alaa Hleihel <alaa@...lanox.com>
Signed-off-by: Leon Romanovsky <leon@...nel.org>
Reviewed-by: Dennis Dalessandro <dennis.dalessandro@...el.com>
Signed-off-by: Jason Gunthorpe <jgg@...lanox.com>
Signed-off-by: Ben Hutchings <ben@...adent.org.uk>
---
 drivers/infiniband/ulp/ipoib/ipoib_fs.c | 2 --
 1 file changed, 2 deletions(-)

--- a/drivers/infiniband/ulp/ipoib/ipoib_fs.c
+++ b/drivers/infiniband/ulp/ipoib/ipoib_fs.c
@@ -281,8 +281,6 @@ void ipoib_delete_debug_files(struct net
 {
 	struct ipoib_dev_priv *priv = netdev_priv(dev);
 
-	WARN_ONCE(!priv->mcg_dentry, "null mcg debug file\n");
-	WARN_ONCE(!priv->path_dentry, "null path debug file\n");
 	debugfs_remove(priv->mcg_dentry);
 	debugfs_remove(priv->path_dentry);
 	priv->mcg_dentry = priv->path_dentry = NULL;