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[2003:ea:8f10:c200:9d9e:757:f317:c524]) by smtp.googlemail.com with ESMTPSA id i7sm7969590wre.64.2021.08.01.03.41.37 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Sun, 01 Aug 2021 03:41:37 -0700 (PDT) Subject: [PATCH net-next 1/4] ethtool: runtime-resume netdev parent before ethtool ioctl ops From: Heiner Kallweit To: Jakub Kicinski , David Miller Cc: "netdev@vger.kernel.org" References: <106547ef-7a61-2064-33f5-3cc8d12adb34@gmail.com> Message-ID: Date: Sun, 1 Aug 2021 12:36:48 +0200 User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:78.0) Gecko/20100101 Thunderbird/78.12.0 MIME-Version: 1.0 In-Reply-To: <106547ef-7a61-2064-33f5-3cc8d12adb34@gmail.com> Content-Language: en-US Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org X-Patchwork-Delegate: kuba@kernel.org If a network device is runtime-suspended then: - network device may be flagged as detached and all ethtool ops (even if not accessing the device) will fail because netif_device_present() returns false - ethtool ops may fail because device is not accessible (e.g. because being in D3 in case of a PCI device) It may not be desirable that userspace can't use even simple ethtool ops that not access the device if interface or link is down. To be more friendly to userspace let's ensure that device is runtime-resumed when executing the respective ethtool op in kernel. Signed-off-by: Heiner Kallweit --- net/ethtool/ioctl.c | 18 +++++++++++++++--- 1 file changed, 15 insertions(+), 3 deletions(-) diff --git a/net/ethtool/ioctl.c b/net/ethtool/ioctl.c index baa5d1004..b7ff9abe7 100644 --- a/net/ethtool/ioctl.c +++ b/net/ethtool/ioctl.c @@ -23,6 +23,7 @@ #include #include #include +#include #include #include #include @@ -2589,7 +2590,7 @@ int dev_ethtool(struct net *net, struct ifreq *ifr) int rc; netdev_features_t old_features; - if (!dev || !netif_device_present(dev)) + if (!dev) return -ENODEV; if (copy_from_user(ðcmd, useraddr, sizeof(ethcmd))) @@ -2645,10 +2646,18 @@ int dev_ethtool(struct net *net, struct ifreq *ifr) return -EPERM; } + if (dev->dev.parent) + pm_runtime_get_sync(dev->dev.parent); + + if (!netif_device_present(dev)) { + rc = -ENODEV; + goto out; + } + if (dev->ethtool_ops->begin) { rc = dev->ethtool_ops->begin(dev); - if (rc < 0) - return rc; + if (rc < 0) + goto out; } old_features = dev->features; @@ -2867,6 +2876,9 @@ int dev_ethtool(struct net *net, struct ifreq *ifr) if (old_features != dev->features) netdev_features_change(dev); +out: + if (dev->dev.parent) + pm_runtime_put(dev->dev.parent); return rc; }