[ofa-general] [PATCH] IPoIB: In unicast_arp, do path_free only for newly-created paths
Jack Morgenstein
jackm at dev.mellanox.co.il
Tue Feb 17 07:01:35 PST 2009
If path_rec_start() returns error, call path_free() only if the path
was newly-created. If we free an existing path whose valid flag was zero,
(but do not detach it from the list) we cause corruption of the
path list (of which it is a member), and get a kernel crash.
The simplest solution is to not free an existing path -- just leave it in the
list as-is (i.e., with its valid flag cleared).
Thanks to Yossi Etigin of Voltaire for identifying the problem flow
which caused the kernel crash.
Signed-off-by: Jack Morgenstein <jackm at dev.mellanox.co.il>
Signed-off-by: Moni Shua <monis at voltaire.com>
---
Roland,
I ran checkpatch.pl on this, and compiled it with Sparse. However, I would still like to continue
using KMail. If you have any editing/formatting problems with the patch, please let me know.
The patch was generated by git diff against your kernel git/master branch.
diff --git a/drivers/infiniband/ulp/ipoib/ipoib_main.c b/drivers/infiniband/ulp/ipoib/ipoib_main.c
index 0bd2a4f..2c8b15f 100644
--- a/drivers/infiniband/ulp/ipoib/ipoib_main.c
+++ b/drivers/infiniband/ulp/ipoib/ipoib_main.c
@@ -660,8 +660,11 @@ static void unicast_arp_send(struct sk_buff *skb, struct net_device *dev,
path = __path_find(dev, phdr->hwaddr + 4);
if (!path || !path->valid) {
- if (!path)
+ int new_path = 0;
+ if (!path) {
path = path_rec_create(dev, phdr->hwaddr + 4);
+ new_path = 1;
+ }
if (path) {
/* put pseudoheader back on for next time */
skb_push(skb, sizeof *phdr);
@@ -669,7 +672,8 @@ static void unicast_arp_send(struct sk_buff *skb, struct net_device *dev,
if (!path->query && path_rec_start(dev, path)) {
spin_unlock_irqrestore(&priv->lock, flags);
- path_free(dev, path);
+ if (new_path)
+ path_free(dev, path);
return;
} else
__path_add(dev, path);
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