netdev - Re: [PATCH v4 4/4] can: kvaser_usb: Retry first bulk transfer on -ETIMEDOUT

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Message-ID: <54B2E23E.1090108@pengutronix.de>
Date:	Sun, 11 Jan 2015 21:51:10 +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>
CC:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Linux-USB <linux-usb@...r.kernel.org>,
	Linux-CAN <linux-can@...r.kernel.org>,
	netdev <netdev@...r.kernel.org>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v4 4/4] can: kvaser_usb: Retry first bulk transfer on
 -ETIMEDOUT

On 01/11/2015 09:45 PM, Ahmed S. Darwish wrote:
> From: Ahmed S. Darwish <ahmed.darwish@...eo.com>
> 
> (This is a draft patch, I'm not sure if this fixes the USB
> bug or only its psymptom. Feedback from the linux-usb folks
> is really appreciated.)
> 
> When plugging the Kvaser USB/CAN dongle the first time, everything
> works as expected and all of the transfers from and to the USB
> device succeeds.
> 
> Meanwhile, after unplugging the device and plugging it again, the
> first bulk transfer _always_ returns an -ETIMEDOUT. The following
> behaviour was observied:
> 
> - Setting higher timeout values for the first bulk transfer never
>   solved the issue.
> 
> - Unloading, then loading, our kvaser_usb module in question
>   __always__ solved the issue.
> 
> - Checking first bulk transfer status, and retry the transfer
>   again in case of an -ETIMEDOUT also __always__ solved the issue.
>   This is what the patch below does.
> 
> - In the testing done so far, this issue appears only on laptops
>   but never on PCs (possibly power related?)
> 
> Signed-off-by: Ahmed S. Darwish <ahmed.darwish@...eo.com>

Does this patch apply apply between 3 and 4? If not, please re-arrange
the series. As this is a bug fix, patches 1, 2 and 4 will go via
net/master, 3 will go via net-next/master.

Marc
-- 
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