netdev - [PATCH 3/4][MAC80211]: Fix potential scheduling while atomic in mesh_path

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Message-ID: <48207073.6010600@openvz.org>
Date:	Tue, 06 May 2008 18:51:31 +0400
From:	Pavel Emelyanov <xemul@...nvz.org>
To:	Johannes Berg <johannes@...solutions.net>,
	"John W. Linville" <linville@...driver.com>
CC:	David Miller <davem@...emloft.net>, linux-wireless@...r.kernel.org,
	Linux Netdev List <netdev@...r.kernel.org>
Subject: [PATCH 3/4][MAC80211]: Fix potential scheduling while atomic in mesh_path_add.

Calling synchronize_rcu() under write-lock-ed pathtbl_resize_lock may
result in this warning (and other side effects).

It looks safe just dropping this lock before calling synchronize_rcu.

Signed-off-by: Pavel Emelyanov <xemul@...nvz.org>

---
 net/mac80211/mesh_pathtbl.c |    3 ++-
 1 files changed, 2 insertions(+), 1 deletions(-)

diff --git a/net/mac80211/mesh_pathtbl.c b/net/mac80211/mesh_pathtbl.c
index 1d2d051..99c2d36 100644
--- a/net/mac80211/mesh_pathtbl.c
+++ b/net/mac80211/mesh_pathtbl.c
@@ -220,9 +220,10 @@ endadd:
 			return -ENOMEM;
 		}
 		rcu_assign_pointer(mesh_paths, newtbl);
+		write_unlock(&pathtbl_resize_lock);
+
 		synchronize_rcu();
 		mesh_table_free(oldtbl, false);
-		write_unlock(&pathtbl_resize_lock);
 	}
 endadd2:
 	return err;
-- 
1.5.3.4

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