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Ivanov" , linux-arm-kernel@lists.infradead.org, linux-usb@vger.kernel.org, Stefan Wahren Subject: [PATCH 3/3] usb: dwc2: Fix HCD port connection race Date: Mon, 2 Dec 2024 01:16:31 +0100 Message-Id: <20241202001631.75473-4-wahrenst@gmx.net> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20241202001631.75473-1-wahrenst@gmx.net> References: <20241202001631.75473-1-wahrenst@gmx.net> MIME-Version: 1.0 X-Provags-ID: V03:K1:zmtuM5DkNntCStJmYi5VCvC05+XSKT7lwIQzihqInJcIRhAIcGf VgNWNQHTKiDILBd4kwXpL+9EgdHufd8+T5YYEXkToLRZERguc9l/cfHazzg/4AtnqyoF7km JyAUyH0o/YtETTl7qhuDT/TZdYiqKYR5UTVnPS34sclZNrgn1MYvgzSUTSDdLPE9+//Ajxo gSrphSjxSfC9kPq++UZ5A== UI-OutboundReport: notjunk:1;M01:P0:nW6iQxO9QDs=;tF2QF696jWkJf2Fcn0lCYEz4JDG wcVu8ujnHHoboNmN0q3tyJuTGxDJ9XNfI8jrNT7J/aftMLQsfrwOt1Y35Wa75fLp+9la2Nc8v YcJKxSK+8EOZgvLmRrbig3FM05Z/Mmu4Aj2pkObCJlWe9OkiTqbRSRI/5j2rlK1gm0pHrMMm+ u3CDNGIWYTirXXFOWgzL6UdFgBOAqpXLTyKLxBMbe7ZjCW6iuOFhqA6f5JxysSle2Bb9yv9cp wYVr8xJBYdRgtAVop0+Apf1ZLQ8EJxuRHETgS2i71rkuVljDJ0/W2+fuE4MyySo5ZnuFjw+SF YGeJ4wuambHWL3EX4QZ16wlc4fAztpJNgGLYL0z8Q+B+R4raPhO13TtQo6UT6yuS/ujDZXrxN vEj75Sk6ElTH75ZBjx9k/wn+6fg3mB9VJRztLr/NqhF2all+WMxD9muhSaXEuH2zXqa208oyK ACmk9H2djKcbjR8aSsAvuO9s3iiGN69jp1rEDZ9xIxhN14xUbKKDQM8ubXTms2cKz2dSDzkXr UuQL1kVAnJTX1obck06MJKB5pZ59CsLWHQyhywZ6y43gvB0Jwnvi7hVg18qskLC5dPqSyPCZN u68SZJ46kPzj7urMxY29aLkKzzqWvTrDTnvGBW46SGJshW5deJ6/iAEhQbHxXGkx6kX7DA4VB BA7LvtxlHpaFnonYJHZ0nDrvpMnJ2HwNE56SBcw40pp9RejHefz4R4DsO0nOdw4bddW6UsY7v i+U5cxeHvF+wntnv9bsr/AptanlCVltYaxFsNae10nQ8/JlCWyk2LeKPzxFrkegnPoo3XJ+PI QMMLUXJo6YEb7aIFBMHl7uKSd3L3fL46nAvoDiBTAQSW21zcZ0+32yn7RWuscM7TbOi56lLyN ckjhXqpYqwF7ImiUdyiDpe/+Mgi1Dn4fz59R/sVO2v8uOR6bQWWvtZA15+2fLbTPaosA7ideE 2X1J3T3SUiUND7SvdykjT2y4sUK7RUOYQVSmNU2I7I9ITeTlQb/4MUyNxclLRy10s2rNzgahP W2Gb+b7kHQx7XLXHsZmA2ospXUuLx/FHfiWaPgZB/FnyasxB/gsOpmOTslI9dvCL957NFTGiK JR5+/D7DkYU0OlyDypriYXFdYrE8kd X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20241201_161648_604213_8E496C4D X-CRM114-Status: GOOD ( 11.96 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org On Raspberry Pis without onboard USB hub frequent device reconnects can trigger a interrupt storm after DWC2 entered host clock gating. This is caused by a race between _dwc2_hcd_suspend() and the port interrupt, which sets port_connect_status. The issue occurs if port_connect_status is still 1, but there is no connection anymore: usb 1-1: USB disconnect, device number 25 dwc2 3f980000.usb: _dwc2_hcd_suspend: port_connect_status: 1 dwc2 3f980000.usb: Entering host clock gating. Disabling IRQ #66 irq 66: nobody cared (try booting with the "irqpoll" option) CPU: 0 UID: 0 PID: 0 Comm: swapper/0 Not tainted 6.12.0-gc1bb81b13202-dirty #322 Hardware name: BCM2835 Call trace: unwind_backtrace from show_stack+0x10/0x14 show_stack from dump_stack_lvl+0x50/0x64 dump_stack_lvl from __report_bad_irq+0x38/0xc0 __report_bad_irq from note_interrupt+0x2ac/0x2f4 note_interrupt from handle_irq_event+0x88/0x8c handle_irq_event from handle_level_irq+0xb4/0x1ac handle_level_irq from generic_handle_domain_irq+0x24/0x34 generic_handle_domain_irq from bcm2836_chained_handle_irq+0x24/0x28 bcm2836_chained_handle_irq from generic_handle_domain_irq+0x24/0x34 generic_handle_domain_irq from generic_handle_arch_irq+0x34/0x44 generic_handle_arch_irq from __irq_svc+0x88/0xb0 Exception stack(0xc1d01f20 to 0xc1d01f68) 1f20: 0004ef3c 00000001 00000000 00000000 c1d09780 c1f6bb5c c1d04e54 c1c60ca8 1f40: c1d04e94 00000000 00000000 c1d092a8 c1f6af20 c1d01f70 c1211b98 c1212f40 1f60: 60000013 ffffffff __irq_svc from default_idle_call+0x1c/0xb0 default_idle_call from do_idle+0x21c/0x284 do_idle from cpu_startup_entry+0x28/0x2c cpu_startup_entry from kernel_init+0x0/0x12c handlers: [] dwc2_handle_common_intr [<58bf98a3>] usb_hcd_irq Disabling IRQ #66 So avoid this by reading the connection status directly. Fixes: 113f86d0c302 ("usb: dwc2: Update partial power down entering by system suspend") Signed-off-by: Stefan Wahren --- drivers/usb/dwc2/hcd.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) -- 2.34.1 diff --git a/drivers/usb/dwc2/hcd.c b/drivers/usb/dwc2/hcd.c index fb4fbd8c43df..8c3941ecaaf5 100644 --- a/drivers/usb/dwc2/hcd.c +++ b/drivers/usb/dwc2/hcd.c @@ -4345,7 +4345,7 @@ static int _dwc2_hcd_suspend(struct usb_hcd *hcd) if (hsotg->bus_suspended) goto skip_power_saving; - if (hsotg->flags.b.port_connect_status == 0) + if (!(dwc2_read_hprt0(hsotg) & HPRT0_CONNSTS)) goto skip_power_saving; switch (hsotg->params.power_down) {