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Fri, 19 Jan 2024 10:35:06 +0100 (CET) Received: from ws-565760.systec.local (unknown [212.185.67.148]) by mail.systec-electronic.com (Postfix) with ESMTPSA id 8CC8B9400107; Fri, 19 Jan 2024 10:35:06 +0100 (CET) From: Andre Werner To: andrew@lunn.ch, hkallweit1@gmail.com, davem@davemloft.net, edumazet@google.com, kuba@kernel.org, pabeni@redhat.com Cc: linux@armlinux.org.uk, netdev@vger.kernel.org, linux-kernel@vger.kernel.org, Andre Werner Subject: [RFC net-next v3 1/2] net: phy: phy_device Prevent nullptr exceptions on ISR Date: Fri, 19 Jan 2024 10:32:25 +0100 Message-ID: <20240119093503.6370-1-andre.werner@systec-electronic.com> X-Mailer: git-send-email 2.43.0 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-getmail-retrieved-from-mailbox: INBOX X-GMAIL-THRID: 1788500920405961550 X-GMAIL-MSGID: 1788510974968242653 If phydev->irq is set unconditionally by MAC drivers, check for valid interrupt handler or fall back to polling mode to prevent nullptr exceptions. Signed-off-by: Andre Werner --- v3: - No changes to v2. Just to complete the series. --- drivers/net/phy/phy_device.c | 22 +++++++++++++++++----- 1 file changed, 17 insertions(+), 5 deletions(-) diff --git a/drivers/net/phy/phy_device.c b/drivers/net/phy/phy_device.c index 3611ea64875e..3986e103d25e 100644 --- a/drivers/net/phy/phy_device.c +++ b/drivers/net/phy/phy_device.c @@ -1413,6 +1413,11 @@ int phy_sfp_probe(struct phy_device *phydev, } EXPORT_SYMBOL(phy_sfp_probe); +static bool phy_drv_supports_irq(struct phy_driver *phydrv) +{ + return phydrv->config_intr && phydrv->handle_interrupt; +} + /** * phy_attach_direct - attach a network device to a given PHY device pointer * @dev: network device to attach @@ -1527,6 +1532,18 @@ int phy_attach_direct(struct net_device *dev, struct phy_device *phydev, if (phydev->dev_flags & PHY_F_NO_IRQ) phydev->irq = PHY_POLL; + /* + * Some drivers may add IRQ numbers unconditionally to a phy device that does + * not implement an interrupt handler after phy_probe is already done. + * Reset to PHY_POLL to prevent nullptr exceptions in that case. + */ + if (!phy_drv_supports_irq(phydev->drv) && phy_interrupt_is_valid(phydev)) { + phydev_warn(phydev, + "No handler for IRQ=%d available. Falling back to polling mode\n", + phydev->irq); + phydev->irq = PHY_POLL; + } + /* Port is set to PORT_TP by default and the actual PHY driver will set * it to different value depending on the PHY configuration. If we have * the generic PHY driver we can't figure it out, thus set the old @@ -2992,11 +3009,6 @@ s32 phy_get_internal_delay(struct phy_device *phydev, struct device *dev, } EXPORT_SYMBOL(phy_get_internal_delay); -static bool phy_drv_supports_irq(struct phy_driver *phydrv) -{ - return phydrv->config_intr && phydrv->handle_interrupt; -} - static int phy_led_set_brightness(struct led_classdev *led_cdev, enum led_brightness value) {