linux-kernel - Re: [PATCH v4 01/13] USB: ch341: fix error handling on resume

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Date:	Fri, 29 Apr 2016 14:16:01 +0200
From:	Johan Hovold <johan@...nel.org>
To:	Grigori Goronzy <greg@...wn.ath.cx>
Cc:	Johan Hovold <johan@...nel.org>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v4 01/13] USB: ch341: fix error handling on resume

On Fri, Apr 15, 2016 at 11:14:04PM +0200, Grigori Goronzy wrote:
> This may fail, do not assume it always works.
> 
> Signed-off-by: Grigori Goronzy <greg@...wn.ath.cx>
> ---
>  drivers/usb/serial/ch341.c | 4 +---
>  1 file changed, 1 insertion(+), 3 deletions(-)
> 
> diff --git a/drivers/usb/serial/ch341.c b/drivers/usb/serial/ch341.c
> index c73808f..63df8ce 100644
> --- a/drivers/usb/serial/ch341.c
> +++ b/drivers/usb/serial/ch341.c
> @@ -544,9 +544,7 @@ static int ch341_reset_resume(struct usb_serial *serial)
>  	priv = usb_get_serial_port_data(serial->port[0]);
>  
>  	/* reconfigure ch341 serial port after bus-reset */
> -	ch341_configure(serial->dev, priv);
> -
> -	return 0;
> +	return ch341_configure(serial->dev, priv);

This is correct, but have noticed that resume is currently broken in
that the interrupt urb is never resubmitted on resume in case the port is
already open?

Also ch341_configure must not use GFP_KERNEL either if called from a
resume path (use GFP_NOIO).

Care to fix this up as well?

>  }
>  
>  static struct usb_serial_driver ch341_device = {

Thanks,
Johan