From: Daniil Tatianin d-tatianin@yandex-team.ru
[ Upstream commit 9deb1e9fb88b1120a908676fa33bdf9e2eeaefce ]
It's not very useful to copy back an empty ethtool_stats struct and return 0 if we didn't actually have any stats. This also allows for further simplification of this function in the future commits.
Signed-off-by: Daniil Tatianin d-tatianin@yandex-team.ru Reviewed-by: Andrew Lunn andrew@lunn.ch Signed-off-by: David S. Miller davem@davemloft.net Signed-off-by: Sasha Levin sashal@kernel.org --- net/core/ethtool.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-)
diff --git a/net/core/ethtool.c b/net/core/ethtool.c index cbd1885f2459..9ae38c3e2bf0 100644 --- a/net/core/ethtool.c +++ b/net/core/ethtool.c @@ -1947,7 +1947,8 @@ static int ethtool_get_phy_stats(struct net_device *dev, void __user *useraddr) return n_stats; if (n_stats > S32_MAX / sizeof(u64)) return -ENOMEM; - WARN_ON_ONCE(!n_stats); + if (WARN_ON_ONCE(!n_stats)) + return -EOPNOTSUPP;
if (copy_from_user(&stats, useraddr, sizeof(stats))) return -EFAULT;