On Thu, Jun 13, 2024 at 03:39:59PM +0800, Meng Li wrote:
> When config CONFIG_USB_DWC3_DUAL_ROLE is selected, and trigger system
> to enter suspend status with below command:
> echo mem > /sys/power/state
> There will be a deadlock issue occurring. Because dwc3_gadget_suspend() also
> try to get the lock again when previous invoked dwc3_suspend_common() has
> got the lock . This issue is introduced by commit c7ebd8149ee5 ("usb: dwc3:
> gadget: Fix NULL pointer dereference in dwc3_gadget_suspend") that removes
> the code of checking whether dwc->gadget_driver is NULL or not. It causes the
> following code is executed and deadlock occurs when trying to get the spinlock.
> To fix the deadlock issue, refer to commit 5265397f9442("usb: dwc3: Remove
> DWC3 locking during gadget suspend/resume"), remove lock of otg mode during
> gadget suspend/resume.
>
> Fixes: 61a348857e86 ("Fix NULL pointer dereference in dwc3_gadget_suspend")
> Cc: [email protected]
> Signed-off-by: Meng Li <[email protected]>
> ---
> drivers/usb/dwc3/core.c | 6 ------
> 1 file changed, 6 deletions(-)
>
> diff --git a/drivers/usb/dwc3/core.c b/drivers/usb/dwc3/core.c
> index 7ee61a89520b..9d47c3aa5777 100644
> --- a/drivers/usb/dwc3/core.c
> +++ b/drivers/usb/dwc3/core.c
> @@ -2250,7 +2250,6 @@ static int dwc3_core_init_for_resume(struct dwc3 *dwc)
>
> static int dwc3_suspend_common(struct dwc3 *dwc, pm_message_t msg)
> {
> - unsigned long flags;
> u32 reg;
> int i;
>
> @@ -2293,9 +2292,7 @@ static int dwc3_suspend_common(struct dwc3 *dwc, pm_message_t msg)
> break;
>
> if (dwc->current_otg_role == DWC3_OTG_ROLE_DEVICE) {
> - spin_lock_irqsave(&dwc->lock, flags);
> dwc3_gadget_suspend(dwc);
> - spin_unlock_irqrestore(&dwc->lock, flags);
> synchronize_irq(dwc->irq_gadget);
> }
>
> @@ -2312,7 +2309,6 @@ static int dwc3_suspend_common(struct dwc3 *dwc, pm_message_t msg)
>
> static int dwc3_resume_common(struct dwc3 *dwc, pm_message_t msg)
> {
> - unsigned long flags;
> int ret;
> u32 reg;
> int i;
> @@ -2366,9 +2362,7 @@ static int dwc3_resume_common(struct dwc3 *dwc, pm_message_t msg)
> if (dwc->current_otg_role == DWC3_OTG_ROLE_HOST) {
> dwc3_otg_host_init(dwc);
> } else if (dwc->current_otg_role == DWC3_OTG_ROLE_DEVICE) {
> - spin_lock_irqsave(&dwc->lock, flags);
> dwc3_gadget_resume(dwc);
> - spin_unlock_irqrestore(&dwc->lock, flags);
> }
>
> break;
> --
> 2.34.1
>
>
Hi,
This is the friendly patch-bot of Greg Kroah-Hartman. You have sent him
a patch that has triggered this response. He used to manually respond
to these common problems, but in order to save his sanity (he kept
writing the same thing over and over, yet to different people), I was
created. Hopefully you will not take offence and will fix the problem
in your patch and resubmit it so that it can be accepted into the Linux
kernel tree.
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Please read the section entitled "The canonical patch format" in the
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If you wish to discuss this problem further, or you have questions about
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