linux-kernel - Re: [PATCH 2/5] can: kvaser_usb: Read all messages in a bulk-in URB buffer

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Message-ID: <55044531.5060105@pengutronix.de>
Date:	Sat, 14 Mar 2015 15:26:57 +0100
From:	Marc Kleine-Budde <mkl@...gutronix.de>
To:	"Ahmed S. Darwish" <darwish.07@...il.com>,
	Olivier Sobrie <olivier@...rie.be>,
	Oliver Hartkopp <socketcan@...tkopp.net>,
	Wolfgang Grandegger <wg@...ndegger.com>,
	Andri Yngvason <andri.yngvason@...el.com>
CC:	Linux-CAN <linux-can@...r.kernel.org>,
	Linux-USB <linux-usb@...r.kernel.org>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 2/5] can: kvaser_usb: Read all messages in a
 bulk-in URB buffer

On 02/26/2015 04:22 PM, Ahmed S. Darwish wrote:
> From: Ahmed S. Darwish <ahmed.darwish@...eo.com>
> 
> The Kvaser firmware can only read and write messages that are
> not crossing the USB endpoint's wMaxPacketSize boundary. While
> receiving commands from the CAN device, if the next command in
> the same URB buffer crossed that max packet size boundary, the
> firmware puts a zero-length placeholder command in its place
> then moves the real command to the next boundary mark.
> 
> The driver did not recognize such behavior, leading to missing
> a good number of rx events during a heavy rx load session.
> 
> Moreover, a tx URB context only gets freed upon receiving its
> respective tx ACK event. Over time, the free tx URB contexts
> pool gets depleted due to the missing ACK events. Consequently,
> the netif transmission queue gets __permanently__ stopped; no
> frames could be sent again except after restarting the CAN
> newtwork interface.
> 
> Signed-off-by: Ahmed S. Darwish <ahmed.darwish@...eo.com>

Can you please send a fix for this endianess errors (against
linux-can-fixes-for-4.0-20150314):

> drivers/net/can/usb/kvaser_usb.c:595:39: warning: restricted __le16 degrades to integer
> drivers/net/can/usb/kvaser_usb.c:1332:31: warning: restricted __le16 degrades to integer

Marc
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