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Miller" , Eric Dumazet , Jakub Kicinski , Paolo Abeni , Nisar Sayed , linux-usb@vger.kernel.org, linux-kernel@vger.kernel.org Subject: [PATCH net] net: usb: lan78xx: reject invalid EEPROM write requests Date: Fri, 9 Oct 2026 02:57:02 +0200 Message-ID: <20261009005702.164936-1-stefanomunari.sm@gmail.com> X-Mailer: git-send-email 2.55.0 Precedence: bulk X-Mailing-List: netdev@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit The runtime PM handling removed the -EINVAL return for invalid EEPROM/OTP write requests. These requests now return zero from a successful usb_autopm_get_interface() call, even though no data is written. Set ret to -EINVAL for invalid requests while preserving the runtime PM reference release. Fixes: 8a7ffeb795f8 ("lan78xx: Fix for eeprom read/write when device auto suspend") Signed-off-by: Stefano Munari --- Tested on a Raspberry Pi 3 Model B+ with the onboard Ethernet controller, using raspberrypi/linux commit bba53a117a4a on the rpi-6.6.y branch as the baseline. ethtool -E eth0 magic 0 offset 0 length 1 value 0 The command succeeds without the patch and reports "Invalid argument" with the patch applied. --- drivers/net/usb/lan78xx.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/drivers/net/usb/lan78xx.c b/drivers/net/usb/lan78xx.c index 5655941f1478..7ac263454d45 100644 --- a/drivers/net/usb/lan78xx.c +++ b/drivers/net/usb/lan78xx.c @@ -1719,6 +1719,8 @@ static int lan78xx_ethtool_set_eeprom(struct net_device *netdev, (ee->len == 512) && (data[0] == OTP_INDICATOR_1)) ret = lan78xx_write_raw_otp(dev, ee->offset, ee->len, data); + else + ret = -EINVAL; usb_autopm_put_interface(dev->intf); -- 2.55.0