linux-kernel - Re: [PATCH v5 4/5] can: kvaser_usb: Retry the first bulk transfer on -ETIMEDOUT

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Message-ID: <20150125115919.GA16000@Darwish.PC>
Date:	Sun, 25 Jan 2015 13:59:19 +0200
From:	"Ahmed S. Darwish" <darwish.07@...il.com>
To:	Sergei Shtylyov <sergei.shtylyov@...entembedded.com>
Cc:	Olivier Sobrie <olivier@...rie.be>,
	Oliver Hartkopp <socketcan@...tkopp.net>,
	Wolfgang Grandegger <wg@...ndegger.com>,
	Marc Kleine-Budde <mkl@...gutronix.de>,
	Andri Yngvason <andri.yngvason@...el.com>,
	Linux-CAN <linux-can@...r.kernel.org>,
	netdev <netdev@...r.kernel.org>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v5 4/5] can: kvaser_usb: Retry the first bulk transfer on
 -ETIMEDOUT

On Wed, Jan 21, 2015 at 03:24:46PM +0300, Sergei Shtylyov wrote:
> Hello.
> 
> On 1/21/2015 12:48 AM, Ahmed S. Darwish wrote:
> 
> >From: Ahmed S. Darwish <ahmed.darwish@...eo.com>
> 
> >On some x86 laptops, plugging a Kvaser device again after an
> >unplug makes the firmware always ignore the very first command.
> >For such a case, provide some room for retries instead of
> >completly exiting the driver init code.
> 
>    Completely.
> 
> >Signed-off-by: Ahmed S. Darwish <ahmed.darwish@...eo.com>
> >---
> >  drivers/net/can/usb/kvaser_usb.c | 12 ++++++++++--
> >  1 file changed, 10 insertions(+), 2 deletions(-)
> 
> >diff --git a/drivers/net/can/usb/kvaser_usb.c b/drivers/net/can/usb/kvaser_usb.c
> >index 640b0eb..068e76c 100644
> >--- a/drivers/net/can/usb/kvaser_usb.c
> >+++ b/drivers/net/can/usb/kvaser_usb.c
> [...]
> >@@ -1632,7 +1632,15 @@ static int kvaser_usb_probe(struct usb_interface *intf,
> >
> >  	usb_set_intfdata(intf, dev);
> >
> >-	err = kvaser_usb_get_software_info(dev);
> >+	/* On some x86 laptops, plugging a Kvaser device again after
> >+	 * an unplug makes the firmware always ignore the very first
> >+	 * command. For such a case, provide some room for retries
> >+	 * instead of completly exiting the driver.
> 
>    Completely.
> 

Thanks, both fixed in the next submission :-D

Regards,
Darwish

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