Re: [PATCH v2 1/3] usb: chipidea: udc: handle USB Error Interrupt if IOC not set

[Peter Chen <peter.chen@kernel.org>]

On 24-09-20 17:40:54, Xu Yang wrote:
> As per USBSTS register description about UEI:
> 
>   When completion of a USB transaction results in an error condition, this
>   bit is set by the Host/Device Controller. This bit is set along with the
>   USBINT bit, if the TD on which the error interrupt occurred also had its
>   interrupt on complete (IOC) bit set.
> 
> UI is set only when IOC set. Add checking UEI to fix miss call
> isr_tr_complete_handler() when IOC have not set and transfer error happen.
> 
> Fixes: 26c696c678c4 ("USB: Chipidea: rename struct ci13xxx variables from udc to ci")
> Cc: stable@vger.kernel.org
> Acked-by: Peter Chen <peter.chen@kernel.com>
> Signed-off-by: Xu Yang <xu.yang_2@nxp.com>

Since this driver has used more than ten years for many vendors, I am
not sure if will affect others or not. Please do not CC stable tree, or
send it to stable tree when this patch at master more than half an year
without no one report issue.

Peter
> 
> ---
> Changes in v2:
>  - modify part commit message
>  - add Ack-by tag
>  - add fix tag and cc stable
> ---
>  drivers/usb/chipidea/udc.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/usb/chipidea/udc.c b/drivers/usb/chipidea/udc.c
> index 95b697f08a76..e0092c735a75 100644
> --- a/drivers/usb/chipidea/udc.c
> +++ b/drivers/usb/chipidea/udc.c
> @@ -2215,7 +2215,7 @@ static irqreturn_t udc_irq(struct ci_hdrc *ci)
>  			}
>  		}
>  
> -		if (USBi_UI  & intr)
> +		if ((USBi_UI | USBi_UEI) & intr)
>  			isr_tr_complete_handler(ci);
>  
>  		if ((USBi_SLI & intr) && !(ci->suspended)) {
> -- 
> 2.34.1
>