linux-kernel - Re: [PATCH] usb: cdns3: Fix issue for clear halt endpoint

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Date:   Sat, 9 Apr 2022 10:35:31 +0800
From:   Peter Chen <peter.chen@...nel.org>
To:     Pawel Laszczak <pawell@...ence.com>
Cc:     rogerq@...nel.org, a-govindraju@...com, gregkh@...uxfoundation.org,
        felipe.balbi@...ux.intel.com, linux-usb@...r.kernel.org,
        linux-kernel@...r.kernel.org, stable@...r.kernel.org
Subject: Re: [PATCH] usb: cdns3: Fix issue for clear halt endpoint

On 22-03-29 10:46:05, Pawel Laszczak wrote:
> Path fixes bug which occurs during resetting endpoint in

%s/Path/Patch, otherwise:

Acked-by: Peter Chen <peter.chen@...nel.org>

> __cdns3_gadget_ep_clear_halt function. During resetting endpoint
> controller will change HW/DMA owned TRB. It set Abort flag in
> trb->control and will change trb->length field. If driver want
> to use the aborted trb it must update the changed field in
> TRB.
> 
> Fixes: 7733f6c32e36 ("usb: cdns3: Add Cadence USB3 DRD Driver")
> cc: <stable@...r.kernel.org>
> Signed-off-by: Pawel Laszczak <pawell@...ence.com>
> ---
>  drivers/usb/cdns3/cdns3-gadget.c | 7 +++++--
>  1 file changed, 5 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/usb/cdns3/cdns3-gadget.c b/drivers/usb/cdns3/cdns3-gadget.c
> index 80aaab159e58..3a9f0968fd24 100644
> --- a/drivers/usb/cdns3/cdns3-gadget.c
> +++ b/drivers/usb/cdns3/cdns3-gadget.c
> @@ -2682,6 +2682,7 @@ int __cdns3_gadget_ep_clear_halt(struct cdns3_endpoint *priv_ep)
>  	struct usb_request *request;
>  	struct cdns3_request *priv_req;
>  	struct cdns3_trb *trb = NULL;
> +	struct cdns3_trb trb_tmp;
>  	int ret;
>  	int val;
>  
> @@ -2691,8 +2692,10 @@ int __cdns3_gadget_ep_clear_halt(struct cdns3_endpoint *priv_ep)
>  	if (request) {
>  		priv_req = to_cdns3_request(request);
>  		trb = priv_req->trb;
> -		if (trb)
> +		if (trb) {
> +			trb_tmp = *trb;
>  			trb->control = trb->control ^ cpu_to_le32(TRB_CYCLE);
> +		}
>  	}
>  
>  	writel(EP_CMD_CSTALL | EP_CMD_EPRST, &priv_dev->regs->ep_cmd);
> @@ -2707,7 +2710,7 @@ int __cdns3_gadget_ep_clear_halt(struct cdns3_endpoint *priv_ep)
>  
>  	if (request) {
>  		if (trb)
> -			trb->control = trb->control ^ cpu_to_le32(TRB_CYCLE);
> +			*trb = trb_tmp;
>  
>  		cdns3_rearm_transfer(priv_ep, 1);
>  	}
> -- 
> 2.25.1
> 

-- 

Thanks,
Peter Chen