Re: [PATCH v4 06/14] usb: don't clear FEAT_C_ENABLE on usb_port_runtime_resume failure

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On Fri, 31 Jan 2014, Dan Williams wrote:

> Three reasons:
> 1/ It's an invalid operation on usb3 ports
> 2/ There's no guarantee of when / if a usb2 port has entered an error
>    state relative to PORT_POWER request
> 3/ The port is active / powered at this point, so khubd will clear it as
>    a matter of course
> 
> Signed-off-by: Dan Williams <dan.j.williams@xxxxxxxxx>
> ---
>  drivers/usb/core/port.c |    1 -
>  1 files changed, 0 insertions(+), 1 deletions(-)
> 
> diff --git a/drivers/usb/core/port.c b/drivers/usb/core/port.c
> index 2227379be652..32290b8d4f8f 100644
> --- a/drivers/usb/core/port.c
> +++ b/drivers/usb/core/port.c
> @@ -105,7 +105,6 @@ static int usb_port_runtime_resume(struct device *dev)
>  		if (retval < 0)

The comment just above this code says that retval is ignored.  Maybe 
you could move that part of the comment after the dev_dbg line?

>  			dev_dbg(&port_dev->dev, "can't get reconnection after setting port  power on, status %d\n",
>  					retval);
> -		usb_clear_port_feature(hdev, port1, USB_PORT_FEAT_C_ENABLE);
>  		retval = 0;
>  	}

Alan Stern

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