linux-kernel - Re: [PATCH AUTOSEL 3.18 36/98] usb: serial: handle -ENODEV quietly in generic_submit_read

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Date:   Fri, 26 Oct 2018 10:39:29 +0200
From:   Johan Hovold <johan@...nel.org>
To:     Sasha Levin <sashal@...nel.org>
Cc:     stable@...r.kernel.org, linux-kernel@...r.kernel.org,
        Jeremiah Mahler <jmmahler@...il.com>,
        Johan Hovold <johan@...nel.org>
Subject: Re: [PATCH AUTOSEL 3.18 36/98] usb: serial: handle -ENODEV quietly
 in generic_submit_read_urb

Hi Sasha,

On Thu, Oct 25, 2018 at 10:17:51AM -0400, Sasha Levin wrote:
> From: Jeremiah Mahler <jmmahler@...il.com>
> 
> [ Upstream commit 04f9c6e6d17584340fb6c8a9469a0e6df28876d2 ]
> 
> If a USB serial device (e.g. /dev/ttyUSB0) with an active program is
> unplugged, an -ENODEV (19) error will be produced after it gives up
> trying to resubmit a read.
> 
>   usb_serial_generic_submit_read_urb - usb_submit_urb failed: -19
> 
> Add -ENODEV as one of the permanent errors along with -EPERM that
> usb_serial_generic_submit_read_urb() handles quietly without an error.
> 
> Signed-off-by: Jeremiah Mahler <jmmahler@...il.com>
> Signed-off-by: Johan Hovold <johan@...nel.org>
> Signed-off-by: Sasha Levin <sashal@...nel.org>

This isn't a bug fix, but more of a clean up patch and hence does not
qualify for stable. So specifically the stable tag was left out on
purpose.

I never got a chance to talk to you in Edinburgh, but Greg mentioned you
had an opt-out list for your autosel work which I'd like to be added to.

I always mark bug fixes that qualify for stable as such so anything else
that your process picks up would already have been considered and
rejected by me.

Thanks,
Johan

> ---
>  drivers/usb/serial/generic.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/usb/serial/generic.c b/drivers/usb/serial/generic.c
> index c44b911937e8..54e170dd3dad 100644
> --- a/drivers/usb/serial/generic.c
> +++ b/drivers/usb/serial/generic.c
> @@ -287,7 +287,7 @@ static int usb_serial_generic_submit_read_urb(struct usb_serial_port *port,
>  
>  	res = usb_submit_urb(port->read_urbs[index], mem_flags);
>  	if (res) {
> -		if (res != -EPERM) {
> +		if (res != -EPERM && res != -ENODEV) {
>  			dev_err(&port->dev,
>  					"%s - usb_submit_urb failed: %d\n",
>  					__func__, res);