netdev - Re: [PATCH 1/1] hso: fix problem with wrong status code sent by OPTION GTM601 during RING indication

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Date:	Fri, 13 Dec 2013 15:43:06 +0100
From:	"Dr. H. Nikolaus Schaller" <hns@...delico.com>
To:	Jan Dumon <j.dumon@...ion.com>, linux-usb@...r.kernel.org,
	netdev@...r.kernel.org, LKML <linux-kernel@...r.kernel.org>
Cc:	Belisko Marek <marek.belisko@...il.com>
Subject: Re: [PATCH 1/1] hso: fix problem with wrong status code sent by OPTION GTM601 during RING indication

Hi,

Am 02.10.2013 um 09:00 schrieb Dr. H. Nikolaus Schaller:

> Hi Jan,
> 
> we are using a GTM601 modem (Firmware 1.7) for a while and have spotted an
> issue that under some conditions the modem sends a packed wIndex over USB
> that is rejected by the hso driver making troubles afterwards. Not rejecting makes
> it work fine.
> 
> BR,
> Nikolaus Schaller
> 
> ---
> 
> From f5c7e15b61f2ce4fe3105ff914f6bfaf5d74af0d Mon Sep 17 00:00:00 2001
> From: "H. Nikolaus Schaller" <hns@...delico.com>
> Date: Thu, 15 Nov 2012 14:40:57 +0100
> Subject: [PATCH 1/1] hso: fix problem with wrong status code sent by OPTION
> GTM601 during RING indication
> 
> It has been observed that the GTM601 with 1.7 firmware sometimes sends a value
> wIndex that has bit 0x04 set instead of being reset as the code expects. So we
> mask it for the error check.
> 
> See http://lists.goldelico.com/pipermail/gta04-owner/2012-February/001643.html
> 
> Signed-off-by: NeilBrown <neilb@...e.de>
> Signed-off-by: H. Nikolaus Schaller <hns@...delico.de>
> ---
> drivers/net/usb/hso.c |    3 ++-
> 1 files changed, 2 insertions(+), 1 deletions(-)
> 
> diff --git a/drivers/net/usb/hso.c b/drivers/net/usb/hso.c
> index cba1d46..d146e26 100644
> --- a/drivers/net/usb/hso.c
> +++ b/drivers/net/usb/hso.c
> @@ -1503,7 +1503,8 @@ static void tiocmget_intr_callback(struct urb *urb)
> 	if (serial_state_notification->bmRequestType != BM_REQUEST_TYPE ||
> 	    serial_state_notification->bNotification != B_NOTIFICATION ||
> 	    le16_to_cpu(serial_state_notification->wValue) != W_VALUE ||
> -	    le16_to_cpu(serial_state_notification->wIndex) != W_INDEX ||
> +	    (le16_to_cpu(serial_state_notification->wIndex) & ~0x4) !=
> +		W_INDEX ||
> 	    le16_to_cpu(serial_state_notification->wLength) != W_LENGTH) {
> 		dev_warn(&usb->dev,
> 			 "hso received invalid serial state notification\n");
> -- 
> 1.7.7.4
> 
> 

I have found this (better) proposal by OPTION, but wonder what did happen to it.
It neither shows in mainline 3.13-rc nor linux-next:

https://lkml.org/lkml/2013/10/9/263

BR,
Nikolaus

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