[PATCH AUTOSEL 4.9 14/98] IB/ipoib: Do not warn if IPoIB debugfs doesn't exist

From: Sasha Levin
Date: Thu Oct 25 2018 - 10:14:51 EST

From: Alaa Hleihel <alaa@xxxxxxxxxxxx>

[ Upstream commit 14fa91e0fef8e4d6feb8b1fa2a807828e0abe815 ]

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@xxxxxxxxxxxx>
Signed-off-by: Leon Romanovsky <leon@xxxxxxxxxx>
Reviewed-by: Dennis Dalessandro <dennis.dalessandro@xxxxxxxxx>
Signed-off-by: Jason Gunthorpe <jgg@xxxxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
drivers/infiniband/ulp/ipoib/ipoib_fs.c | 2 --
1 file changed, 2 deletions(-)

diff --git a/drivers/infiniband/ulp/ipoib/ipoib_fs.c b/drivers/infiniband/ulp/ipoib/ipoib_fs.c
index 09396bd7b02d..63be3bcdc0e3 100644
--- 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_device *dev)
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");
priv->mcg_dentry = priv->path_dentry = NULL;