[PATCH] ieee80211: Fix kernel Oops when module unload

tree b69e983266840983183a00f5ac02c66d5270ca47
parent cdd6372949b76694622ed74fe36e1dd17a92eb71
author Zhu Yi <jketreno@io.(none)> 1124435425 -0500
committer James Ketrenos <jketreno@linux.intel.com> 1127312421 -0500

Fix kernel Oops when module unload.

Export a new function ieee80211_crypt_quiescing from ieee80211. Device
drivers call it to make the host crypto stack enter the quiescence
state, which means "process existing requests, but don't accept new
ones". This is usually called during a driver's host crypto data
structure free (module unload) path.

Signed-off-by: James Ketrenos <jketreno@linux.intel.com>
Signed-off-by: Jeff Garzik <jgarzik@pobox.com>

1 files changed, 2 insertions, 0 deletions

diff --git a/net/ieee80211/ieee80211_module.c b/net/ieee80211/ieee80211_module.c
index 4b43ae1235f9..82a4fd713b28 100644
--- a/net/ieee80211/ieee80211_module.c
+++ b/net/ieee80211/ieee80211_module.c
@@ -138,6 +138,7 @@ struct net_device *alloc_ieee80211(int sizeof_priv)
         init_timer(&ieee->crypt_deinit_timer);
         ieee->crypt_deinit_timer.data = (unsigned long)ieee;
         ieee->crypt_deinit_timer.function = ieee80211_crypt_deinit_handler;
+        ieee->crypt_quiesced = 0;
 
         spin_lock_init(&ieee->lock);
 
@@ -161,6 +162,7 @@ void free_ieee80211(struct net_device *dev)
 
         int i;
 
+        ieee80211_crypt_quiescing(ieee);
         del_timer_sync(&ieee->crypt_deinit_timer);
         ieee80211_crypt_deinit_entries(ieee, 1);