From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S934843AbYCSWJg (ORCPT ); Wed, 19 Mar 2008 18:09:36 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S933917AbYCSUeB (ORCPT ); Wed, 19 Mar 2008 16:34:01 -0400 Received: from einhorn.in-berlin.de ([192.109.42.8]:37692 "EHLO einhorn.in-berlin.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S933909AbYCSUeA (ORCPT ); Wed, 19 Mar 2008 16:34:00 -0400 X-Envelope-From: stefanr@s5r6.in-berlin.de Date: Wed, 19 Mar 2008 21:32:56 +0100 (CET) From: Stefan Richter Subject: [PATCH] firewire: fw-ohci: add self ID error check To: Jarod Wilson cc: linux1394-devel@lists.sourceforge.net, linux-kernel@vger.kernel.org In-Reply-To: Message-ID: References: MIME-Version: 1.0 Content-Type: TEXT/PLAIN; CHARSET=us-ascii Content-Disposition: INLINE Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Discard self ID buffer contents if - the selfIDError flag is set, - any of the self ID packets has bit errors. Signed-off-by: Stefan Richter --- drivers/firewire/fw-ohci.c | 12 +++++++++--- drivers/firewire/fw-ohci.h | 1 + 2 files changed, 10 insertions(+), 3 deletions(-) Index: linux/drivers/firewire/fw-ohci.c =================================================================== --- linux.orig/drivers/firewire/fw-ohci.c +++ linux/drivers/firewire/fw-ohci.c @@ -1060,20 +1060,26 @@ static void bus_reset_tasklet(unsigned l ohci->node_id = reg & (OHCI1394_NodeID_busNumber | OHCI1394_NodeID_nodeNumber); + reg = reg_read(ohci, OHCI1394_SelfIDCount); + if (reg & OHCI1394_SelfIDCount_selfIDError) { + fw_error("inconsistent self IDs\n"); + return; + } /* * The count in the SelfIDCount register is the number of * bytes in the self ID receive buffer. Since we also receive * the inverted quadlets and a header quadlet, we shift one * bit extra to get the actual number of self IDs. */ - - self_id_count = (reg_read(ohci, OHCI1394_SelfIDCount) >> 3) & 0x3ff; + self_id_count = (reg >> 3) & 0x3ff; generation = (cond_le32_to_cpu(ohci->self_id_cpu[0]) >> 16) & 0xff; rmb(); for (i = 1, j = 0; j < self_id_count; i += 2, j++) { - if (ohci->self_id_cpu[i] != ~ohci->self_id_cpu[i + 1]) + if (ohci->self_id_cpu[i] != ~ohci->self_id_cpu[i + 1]) { fw_error("inconsistent self IDs\n"); + return; + } ohci->self_id_buffer[j] = cond_le32_to_cpu(ohci->self_id_cpu[i]); } Index: linux/drivers/firewire/fw-ohci.h =================================================================== --- linux.orig/drivers/firewire/fw-ohci.h +++ linux/drivers/firewire/fw-ohci.h @@ -30,6 +30,7 @@ #define OHCI1394_HCControl_softReset 0x00010000 #define OHCI1394_SelfIDBuffer 0x064 #define OHCI1394_SelfIDCount 0x068 +#define OHCI1394_SelfIDCount_selfIDError 0x80000000 #define OHCI1394_IRMultiChanMaskHiSet 0x070 #define OHCI1394_IRMultiChanMaskHiClear 0x074 #define OHCI1394_IRMultiChanMaskLoSet 0x078 -- Stefan Richter -=====-==--- --== =--== http://arcgraph.de/sr/