From mboxrd@z Thu Jan 1 00:00:00 1970 From: Oliver Hartkopp Subject: Re: [Socketcan-users] Message stalls in SocketCan Layer? Date: Fri, 03 Feb 2012 17:57:03 +0100 Message-ID: <4F2C11DF.7010707@hartkopp.net> References: <4F29091F.4010908@in.tum.de> <4F2AA5DF.9080304@grandegger.com> <4F2C0675.1050808@in.tum.de> Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: QUOTED-PRINTABLE Return-path: Received: from mo-p00-ob.rzone.de ([81.169.146.162]:34426 "EHLO mo-p00-ob.rzone.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1757136Ab2BCQ5U (ORCPT ); Fri, 3 Feb 2012 11:57:20 -0500 In-Reply-To: <4F2C0675.1050808@in.tum.de> Sender: linux-can-owner@vger.kernel.org List-ID: To: =?ISO-8859-1?Q?Michael_J=E4ntsch?= Cc: linux-can@vger.kernel.org Hi Michael, On 03.02.2012 17:08, Michael J=E4ntsch wrote: > yes, it all started when I switched to kernel 3.0.0-15-generic. Howev= er, > weirdly enough there is one computer with this kernel where the probl= em > doesn't appear and two where it does. I think I will confirm this by > going back to an older kernel and seeing if the problem disappears. please consider that if it works on other machines with the same kernel= that there could be some changes within the USB subsystem or some interrupt = or ACPI/powersaving issues too. Going back to an older Kernel is a good check - don't know, if you also= can go further (3.1, 3.2) with Ubuntu 11.10 too ?!? Maybe there's some USB debugging available to check whether the URB has= been sent properly to the USB wire and if the interrupt of the USB controlle= r reached the system after sending. Generally i would not assume that there's a problem in the PF_CAN netla= yer in this special case. Regards, Oliver