linux-kernel - Re: [RFC v5 4/6] usb: gadget: configfs: Check USB configuration before adding

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Date:   Mon, 31 Aug 2020 02:29:48 +0000
From:   Peter Chen <peter.chen@....com>
To:     Wesley Cheng <wcheng@...eaurora.org>
CC:     "robh+dt@...nel.org" <robh+dt@...nel.org>,
        "bjorn.andersson@...aro.org" <bjorn.andersson@...aro.org>,
        "balbi@...nel.org" <balbi@...nel.org>,
        "gregkh@...uxfoundation.org" <gregkh@...uxfoundation.org>,
        "agross@...nel.org" <agross@...nel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-arm-msm@...r.kernel.org" <linux-arm-msm@...r.kernel.org>,
        "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
        "linux-usb@...r.kernel.org" <linux-usb@...r.kernel.org>,
        "jackp@...eaurora.org" <jackp@...eaurora.org>
Subject: Re: [RFC v5 4/6] usb: gadget: configfs: Check USB configuration
 before adding

On 20-08-28 22:58:44, Wesley Cheng wrote:
> Ensure that the USB gadget is able to support the configuration being
> added based on the number of endpoints required from all interfaces.  This
> is for accounting for any bandwidth or space limitations.
> 
> Signed-off-by: Wesley Cheng <wcheng@...eaurora.org>
> ---
>  drivers/usb/gadget/configfs.c | 22 ++++++++++++++++++++++
>  1 file changed, 22 insertions(+)
> 
> diff --git a/drivers/usb/gadget/configfs.c b/drivers/usb/gadget/configfs.c
> index 56051bb97349..7c74c04b1d8c 100644
> --- a/drivers/usb/gadget/configfs.c
> +++ b/drivers/usb/gadget/configfs.c
> @@ -1361,6 +1361,7 @@ static int configfs_composite_bind(struct usb_gadget *gadget,
>  		struct usb_function *f;
>  		struct usb_function *tmp;
>  		struct gadget_config_name *cn;
> +		unsigned long ep_map = 0;
>  
>  		if (gadget_is_otg(gadget))
>  			c->descriptors = otg_desc;
> @@ -1390,7 +1391,28 @@ static int configfs_composite_bind(struct usb_gadget *gadget,
>  				list_add(&f->list, &cfg->func_list);
>  				goto err_purge_funcs;
>  			}
> +			if (f->ss_descriptors) {
> +				struct usb_descriptor_header **d;
> +
> +				d = f->ss_descriptors;
> +				for (; *d; ++d) {
> +					struct usb_endpoint_descriptor *ep;
> +					int addr;
> +
> +					if ((*d)->bDescriptorType != USB_DT_ENDPOINT)
> +						continue;
> +
> +					ep = (struct usb_endpoint_descriptor *)*d;
> +					addr = ((ep->bEndpointAddress & 0x80) >> 3) |
> +						(ep->bEndpointAddress & 0x0f);

">> 3" or "<< 3?

> +					set_bit(addr, &ep_map);

You want to record all endpoints on ep_map? Considering there are
four EP_IN (1-4), and four EP_OUT (1-4), what the value of ep_map
would like?

> +				}
> +			}
>  		}
> +		ret = usb_gadget_check_config(cdev->gadget, ep_map);
> +		if (ret)
> +			goto err_purge_funcs;
> +

You may move this patch after your 4nd patch to avoid "git bisect"
issue.

>  		usb_ep_autoconfig_reset(cdev->gadget);
>  	}
>  	if (cdev->use_os_string) {
> -- 
> The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum,
> a Linux Foundation Collaborative Project
> 

-- 

Thanks,
Peter Chen