linux-kernel - Re: [PATCH v2 04/11] USB: core: hub.c: use usb_control_msg

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Date:   Mon, 7 Sep 2020 11:08:58 -0400
From:   Alan Stern <stern@...land.harvard.edu>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:     himadrispandya@...il.com, dvyukov@...gle.com,
        linux-usb@...r.kernel.org, perex@...ex.cz, tiwai@...e.com,
        stern@...land.harvard.ed, linux-kernel@...r.kernel.org,
        marcel@...tmann.org, johan.hedberg@...il.com,
        linux-bluetooth@...r.kernel.org, alsa-devel@...a-project.org
Subject: Re: [PATCH v2 04/11] USB: core: hub.c: use usb_control_msg_send() in
 a few places

On Mon, Sep 07, 2020 at 04:51:01PM +0200, Greg Kroah-Hartman wrote:
> There are a few calls to usb_control_msg() that can be converted to use
> usb_control_msg_send() instead, so do that in order to make the error
> checking a bit simpler and the code smaller.
> 
> Cc: Alan Stern <stern@...land.harvard.edu>
> Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
> ---
> v2:
>  - dropped changes to usb_req_set_sel() thanks to review from Alan

> @@ -4056,7 +4035,7 @@ static void usb_enable_link_state(struct usb_hcd *hcd, struct usb_device *udev,
>  	 * associated with the link state we're about to enable.
>  	 */
>  	ret = usb_req_set_sel(udev, state);
> -	if (ret < 0) {
> +	if (ret) {
>  		dev_warn(&udev->dev, "Set SEL for device-initiated %s failed.\n",
>  				usb3_lpm_names[state]);
>  		return;

Did this change survive by mistake?

Actually, it looks like usb_req_set_sel needs to check the value 
returned by usb_control_msg -- a perfect example of the sort of thing 
you were trying to fix in the first place!

Alan Stern