On Sat, Mar 22, 2025 at 6:03 AM Thinh Nguyen Thinh.Nguyen@synopsys.com wrote:
On Thu, Mar 20, 2025, Kuen-Han Tsai wrote:
When dwc3_gadget_soft_disconnect() fails, dwc3_suspend_common() keeps going with the suspend, resulting in a period where the power domain is off, but the gadget driver remains connected. Within this time frame, invoking vbus_event_work() will cause an error as it attempts to access DWC3 registers for endpoint disabling after the power domain has been completely shut down.
Abort the suspend sequence when dwc3_gadget_suspend() cannot halt the controller and proceeds with a soft connect.
CC: stable@vger.kernel.org
Please add Fixes tag.
Sent out v2 version of the patch. https://lore.kernel.org/linux-usb/20250324031758.865242-1-khtsai@google.com/
Signed-off-by: Kuen-Han Tsai khtsai@google.com
Kernel panic - not syncing: Asynchronous SError Interrupt Workqueue: events vbus_event_work Call trace: dump_backtrace+0xf4/0x118 show_stack+0x18/0x24 dump_stack_lvl+0x60/0x7c dump_stack+0x18/0x3c panic+0x16c/0x390 nmi_panic+0xa4/0xa8 arm64_serror_panic+0x6c/0x94 do_serror+0xc4/0xd0 el1h_64_error_handler+0x34/0x48 el1h_64_error+0x68/0x6c readl+0x4c/0x8c __dwc3_gadget_ep_disable+0x48/0x230 dwc3_gadget_ep_disable+0x50/0xc0 usb_ep_disable+0x44/0xe4 ffs_func_eps_disable+0x64/0xc8 ffs_func_set_alt+0x74/0x368 ffs_func_disable+0x18/0x28 composite_disconnect+0x90/0xec configfs_composite_disconnect+0x64/0x88 usb_gadget_disconnect_locked+0xc0/0x168 vbus_event_work+0x3c/0x58 process_one_work+0x1e4/0x43c worker_thread+0x25c/0x430 kthread+0x104/0x1d4 ret_from_fork+0x10/0x20
drivers/usb/dwc3/core.c | 10 +++++++--- drivers/usb/dwc3/gadget.c | 22 +++++++++------------- 2 files changed, 16 insertions(+), 16 deletions(-)
diff --git a/drivers/usb/dwc3/core.c b/drivers/usb/dwc3/core.c index 66a08b527165..d64d17677bdb 100644 --- a/drivers/usb/dwc3/core.c +++ b/drivers/usb/dwc3/core.c @@ -2387,7 +2387,7 @@ static int dwc3_core_init_for_resume(struct dwc3 *dwc) static int dwc3_suspend_common(struct dwc3 *dwc, pm_message_t msg) { u32 reg;
int i;
int i, ret;Minor nit: Can we keep declarations in separate lines.
Fixed.
if (!pm_runtime_suspended(dwc->dev) && !PMSG_IS_AUTO(msg)) { dwc->susphy_state = (dwc3_readl(dwc->regs, DWC3_GUSB2PHYCFG(0)) &@@ -2406,7 +2406,9 @@ static int dwc3_suspend_common(struct dwc3 *dwc, pm_message_t msg) case DWC3_GCTL_PRTCAP_DEVICE: if (pm_runtime_suspended(dwc->dev)) break;
dwc3_gadget_suspend(dwc);
ret = dwc3_gadget_suspend(dwc);if (ret)return ret synchronize_irq(dwc->irq_gadget); dwc3_core_exit(dwc); break;@@ -2441,7 +2443,9 @@ static int dwc3_suspend_common(struct dwc3 *dwc, pm_message_t msg) break;
if (dwc->current_otg_role == DWC3_OTG_ROLE_DEVICE) {
dwc3_gadget_suspend(dwc);
ret = dwc3_gadget_suspend(dwc);if (ret)return ret; synchronize_irq(dwc->irq_gadget); }diff --git a/drivers/usb/dwc3/gadget.c b/drivers/usb/dwc3/gadget.c index 89a4dc8ebf94..316c1589618e 100644 --- a/drivers/usb/dwc3/gadget.c +++ b/drivers/usb/dwc3/gadget.c @@ -4776,26 +4776,22 @@ int dwc3_gadget_suspend(struct dwc3 *dwc) int ret;
ret = dwc3_gadget_soft_disconnect(dwc);
if (ret)goto err;spin_lock_irqsave(&dwc->lock, flags);if (dwc->gadget_driver)dwc3_disconnect_gadget(dwc);spin_unlock_irqrestore(&dwc->lock, flags);return 0;-err: /* * Attempt to reset the controller's state. Likely no * communication can be established until the host * performs a port reset. */
if (dwc->softconnect)
if (ret && dwc->softconnect) { dwc3_gadget_soft_connect(dwc);return ret;}
return ret;
spin_lock_irqsave(&dwc->lock, flags);if (dwc->gadget_driver)dwc3_disconnect_gadget(dwc);spin_unlock_irqrestore(&dwc->lock, flags);return 0;}
int dwc3_gadget_resume(struct dwc3 *dwc)
2.49.0.395.g12beb8f557-goog
The rest looks good.
Thanks, Thinh
Thanks, Kuen-Han