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Fri, 19 Jan 2024 07:55:52 +0100 (CET) Received: from ws-565760.systec.local (unknown [212.185.67.148]) by mail.systec-electronic.com (Postfix) with ESMTPSA id 0C5879400107; Fri, 19 Jan 2024 07:55:52 +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 v2 1/2] net: phy: phy_device Prevent nullptr exceptions on ISR Date: Fri, 19 Jan 2024 07:51:13 +0100 Message-ID: <20240119065542.30279-1-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: 1788500920405961550 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 --- It was exact the way described by Heiner Kallweit. The Kernel Oops looked as follows: [ +0.004455] smsc95xx v2.0.0 [ +0.578343] ADIN1100 usb-001:007:00: attached PHY driver (mii_bus:phy_addr=usb-001:007:00, irq=149) [ +0.000526] smsc95xx 1-4:1.0 eth0: register 'smsc95xx' at usb-0000:00:14.0-4, smsc95xx USB 2.0 Ethernet, 44:d5:f2:a0:4d:bc [ +0.027107] smsc95xx 1-4:1.0 enp0s20f0u4: renamed from eth0 [ +0.073992] smsc95xx 1-4:1.0 enp0s20f0u4: Link is Down [ +9.559260] BUG: kernel NULL pointer dereference, address: 0000000000000000 [ +0.000020] #PF: supervisor instruction fetch in kernel mode [ +0.000008] #PF: error_code(0x0010) - not-present page [ +0.000009] PGD 0 P4D 0 [ +0.000011] Oops: 0010 [#1] PREEMPT SMP NOPTI [ +0.000013] CPU: 4 PID: 2073 Comm: irq/149-usb-001 Tainted: G OE 6.5.5-arch1-1 #1 d82a0f532dd8cfe67d5795c1738d9c01059a0c62 [ +0.000014] Hardware name: LENOVO 20RD001CGE/20RD001CGE, BIOS R16ET29W (1.15 ) 12/03/2020 [ +0.000006] RIP: 0010:0x0 [ +0.000100] Code: Unable to access opcode bytes at 0xffffffffffffffd6. [ +0.000007] RSP: 0018:ffffb3b8c35b3e58 EFLAGS: 00010246 [ +0.000011] RAX: 0000000000000000 RBX: ffff8e5a84d10800 RCX: 0000000000000002 [ +0.000007] RDX: ffff8e5aeba52100 RSI: ffff8e5a84d10800 RDI: ffff8e5a84d10800 [ +0.000007] RBP: ffff8e5a84d10d48 R08: 0000000000000000 R09: 0000000000000000 [ +0.000007] R10: 0000000000000001 R11: 0000000000000100 R12: ffffffffc22720a0 [ +0.000007] R13: ffff8e5a8a0a0c80 R14: ffffffff983505e0 R15: ffff8e5aed177940 [ +0.000006] FS: 0000000000000000(0000) GS:ffff8e5dd1500000(0000) knlGS:0000000000000000 [ +0.000009] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ +0.000007] CR2: ffffffffffffffd6 CR3: 000000025b020004 CR4: 00000000003706e0 [ +0.000007] Call Trace: [ +0.000006] [ +0.000008] ? __die+0x23/0x70 [ +0.000018] ? page_fault_oops+0x171/0x4e0 [ +0.000017] ? sched_clock+0x10/0x30 [ +0.000010] ? sched_clock_cpu+0xf/0x190 [ +0.000015] ? exc_page_fault+0x7f/0x180 [ +0.000018] ? asm_exc_page_fault+0x26/0x30 [ +0.000014] ? __pfx_irq_thread_fn+0x10/0x10 [ +0.000031] phy_interrupt+0xac/0xf0 [libphy 6d44c9178d1bba7d6a381c1347a9242562ba5983] [ +0.000097] irq_thread_fn+0x20/0x60 [ +0.000014] irq_thread+0xfb/0x1c0 [ +0.000012] ? __pfx_irq_thread_dtor+0x10/0x10 [ +0.000013] ? __pfx_irq_thread+0x10/0x10 [ +0.000011] kthread+0xe5/0x120 [ +0.000013] ? __pfx_kthread+0x10/0x10 [ +0.000012] ret_from_fork+0x31/0x50 [ +0.000010] ? __pfx_kthread+0x10/0x10 [ +0.000011] ret_from_fork_asm+0x1b/0x30 [ +0.000022] [ +0.000005] Modules linked in: adin1100 smsc95xx selftests usbnet [..] [ +0.000082] CR2: 0000000000000000 [ +0.000007] ---[ end trace 0000000000000000 ]--- v2: - Added the workaround to phy_attach_direct as discussed in first patch submission. TODO: Make phy_device->irq private and add access function that proves availability of interrupt handler in phy driver. --- 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) {