netdev - [PATCH 09/16] myri10ge: fix potential infinite loop in enable

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Date:	Fri, 09 May 2008 02:19:29 +0200
From:	Brice Goglin <brice@...i.com>
To:	Jeff Garzik <jeff@...zik.org>
CC:	netdev@...r.kernel.org
Subject: [PATCH 09/16] myri10ge: fix potential infinite loop in enable_ecrc

Fix another potential for an infinite loop while looking for the
root port in myri10ge_enable_ecrc().

Signed-off-by: Brice Goglin <brice@...i.com>
Signed-off-by: Andrew Gallatin <gallatin@...i.com>
---
 drivers/net/myri10ge/myri10ge.c |    5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

Index: linux-2.6/drivers/net/myri10ge/myri10ge.c
===================================================================
--- linux-2.6.orig/drivers/net/myri10ge/myri10ge.c	2008-05-09 00:06:20.000000000 +0200
+++ linux-2.6/drivers/net/myri10ge/myri10ge.c	2008-05-09 00:07:17.000000000 +0200
@@ -2657,13 +2657,14 @@
 	ext_type = (val & PCI_EXP_FLAGS_TYPE) >> 4;
 	if (ext_type != PCI_EXP_TYPE_ROOT_PORT) {
 		if (myri10ge_ecrc_enable > 1) {
-			struct pci_dev *old_bridge = bridge;
+			struct pci_dev *prev_bridge, *old_bridge = bridge;
 
 			/* Walk the hierarchy up to the root port
 			 * where ECRC has to be enabled */
 			do {
+				prev_bridge = bridge;
 				bridge = bridge->bus->self;
-				if (!bridge) {
+				if (!bridge || prev_bridge == bridge) {
 					dev_err(dev,
 						"Failed to find root port"
 						" to force ECRC\n");


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