linux-kernel - [PATCH] firewire: fw-ohci: catch self_id

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Date:	Wed, 19 Mar 2008 22:05:02 +0100 (CET)
From:	Stefan Richter <stefanr@...6.in-berlin.de>
To:	Jarod Wilson <jwilson@...hat.com>
cc:	linux1394-devel@...ts.sourceforge.net, linux-kernel@...r.kernel.org
Subject: [PATCH] firewire: fw-ohci: catch self_id_count == 0

fw_core_handle_bus_reset() incorrectly relied on the assumption that
self_id_count > 0.

We check early in fw-ohci and discard the self ID complete event if
self_id_count == 0 because a valid event always has at least one self ID
packet in it (the one of the local node).  Hence treat self_id_count ==
0 like any other kind of invalid self ID buffer.

Signed-off-by: Stefan Richter <stefanr@...6.in-berlin.de>
---

Applies after patch "firewire: fw-ohci: add self ID error check".
Supersedes patch "firewire: catch self_id_count == 0".

 drivers/firewire/fw-ohci.c |    4 ++++
 1 file changed, 4 insertions(+)

Index: linux/drivers/firewire/fw-ohci.c
===================================================================
--- linux.orig/drivers/firewire/fw-ohci.c
+++ linux/drivers/firewire/fw-ohci.c
@@ -1072,6 +1072,10 @@ static void bus_reset_tasklet(unsigned l
 	 * bit extra to get the actual number of self IDs.
 	 */
 	self_id_count = (reg >> 3) & 0x3ff;
+	if (self_id_count == 0) {
+		fw_notify("inconsistent self IDs\n");
+		return;
+	}
 	generation = (cond_le32_to_cpu(ohci->self_id_cpu[0]) >> 16) & 0xff;
 	rmb();
 

-- 
Stefan Richter
-=====-==--- --== =--==
http://arcgraph.de/sr/

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