Alan Jenkins wrote:
> Johannes Berg wrote:
>
>> That doesn't seem relevant, this just does some initialisation. However,
>> you definitely missed adding a call to wep_free().
>>
>>
>
> Hah, I should have realized something was wrong when I noticed I was
> removing more lines that I added.
>
> The crypto init does cause the module load:
>
> wait_for_completion
> call_usermodehelper_exec
> __request_module
> crypto_larval_lookup
> ? extract_entropy
> crypto_alg_mod_lookup
> crypto_alloc_base
> ieee80211_wep_init
> ieee80211_register_hw
>
Here's a corrected patch complete with changelog. If there are no other
problems with it, can you please apply this for 2.6.30 to keep my EeePC
regression-free?
Thanks
Alan
------>
>From c5e9dc036247e70956d1a28e8850c3810385dda0 Mon Sep 17 00:00:00 2001
From: Alan Jenkins <alan-jenkins@xxxxxxxxxxxxxx>
Date: Wed, 29 Apr 2009 11:41:24 +0100
Subject: [PATCH] mac80211: fix modprobe deadlock by not calling wep_init under rtnl_lock
- ieee80211_wep_init(), which is called with rtnl_lock held, blocks in
request_module() [waiting for modprobe to load a crypto module].
- modprobe blocks in a call to flush_workqueue(), when it closes a TTY
[presumably when it exits].
- The workqueue item linkwatch_event() blocks on rtnl_lock.
There's no reason for wep_init() to be called with rtnl_lock held, so
just move it outside the critical section.
Signed-off-by: Alan Jenkins <alan-jenkins@xxxxxxxxxxxxxx>
---
net/mac80211/main.c | 19 +++++++++----------
1 files changed, 9 insertions(+), 10 deletions(-)
diff --git a/net/mac80211/main.c b/net/mac80211/main.c
index fbcbed6..00968c2 100644
--- a/net/mac80211/main.c
+++ b/net/mac80211/main.c
@@ -909,6 +909,13 @@ int ieee80211_register_hw(struct ieee80211_hw *hw)
if (result < 0)
goto fail_sta_info;
+ result = ieee80211_wep_init(local);
+ if (result < 0) {
+ printk(KERN_DEBUG "%s: Failed to initialize wep: %d\n",
+ wiphy_name(local->hw.wiphy), result);
+ goto fail_wep;
+ }
+
rtnl_lock();
result = dev_alloc_name(local->mdev, local->mdev->name);
if (result < 0)
@@ -930,14 +937,6 @@ int ieee80211_register_hw(struct ieee80211_hw *hw)
goto fail_rate;
}
- result = ieee80211_wep_init(local);
-
- if (result < 0) {
- printk(KERN_DEBUG "%s: Failed to initialize wep: %d\n",
- wiphy_name(local->hw.wiphy), result);
- goto fail_wep;
- }
-
/* add one default STA interface if supported */
if (local->hw.wiphy->interface_modes & BIT(NL80211_IFTYPE_STATION)) {
result = ieee80211_if_add(local, "wlan%d", NULL,
@@ -967,13 +966,13 @@ int ieee80211_register_hw(struct ieee80211_hw *hw)
return 0;
-fail_wep:
- rate_control_deinitialize(local);
fail_rate:
unregister_netdevice(local->mdev);
local->mdev = NULL;
fail_dev:
rtnl_unlock();
+ ieee80211_wep_free(local);
+fail_wep:
sta_info_stop(local);
fail_sta_info:
debugfs_hw_del(local);
--
1.5.4.3
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