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iwlwifi: fix oops in iwl3945_led_brightness_set 

fix race between:
ieee80211_open->ieee80211_led_radio->led_trigger_event->led_set_brightness->iwl3945_led_brightness_set
(which assumes that "led->priv" is not NULL)
and
iwl3945_pci_probe->iwl3945_setup_deferred_work->(...)->iwl3945_bg_alive_start->iwl3945_alive_start->iwl3945_led_register->iwl3945_led_register_led
which sets priv field in struct iwl3945_led
after
led->led_dev.brightness_set = iwl3945_led_brightness_set;
(...)
led_classdev_register(device, &led->led_dev);

http://kerneloops.org/guilty.php?guilty=iwl3945_led_brightness_set&version=2.6.25-release&start=1671168&end=1703935&class=oops

Signed-off-by: Marcin Slusarz <marcin.slusarz@gmail.com>
Cc: Zhu Yi <yi.zhu@intel.com>
Cc: Reinette Chatre <reinette.chatre@intel.com>
Cc: Tomas Winkler <tomas.winkler@intel.com>
Cc: linux-wireless@vger.kernel.org
Cc: ipw3945-devel@lists.sourceforge.net
Signed-off-by: John W. Linville <linville@tuxdriver.com>
This commit is contained in:
Marcin Slusarz 2008-06-08 13:13:06 +02:00 committed by John W. Linville
parent 585c5434f0
commit b6b16196b0
1 changed files with 3 additions and 2 deletions
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5
drivers/net/wireless/iwlwifi/iwl-3945-led.c
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@ -229,14 +229,15 @@ static int iwl3945_led_register_led(struct iwl3945_priv *priv,
led->led_dev.brightness_set = iwl3945_led_brightness_set;
led->led_dev.default_trigger = trigger;
led->priv = priv;
led->type = type;
ret = led_classdev_register(device, &led->led_dev);
if (ret) {
IWL_ERROR("Error: failed to register led handler.\n");
return ret;
}
led->priv = priv;
led->type = type;
led->registered = 1;
if (set_led && led->led_on)