iwlwifi: fix possible priv->mutex deadlock during suspend
This patch moves _cancel_deferred_work out of mutex protection and removes
unnecessary mutex in pci_suspend and pci_resume.
Cc: Johannes Berg <johannes@sipsolutions.net>
Signed-off-by: Zhu Yi <yi.zhu@intel.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
diff --git a/drivers/net/wireless/iwlwifi/iwl4965-base.c b/drivers/net/wireless/iwlwifi/iwl4965-base.c
index 8f85564..ed148ea 100644
--- a/drivers/net/wireless/iwlwifi/iwl4965-base.c
+++ b/drivers/net/wireless/iwlwifi/iwl4965-base.c
@@ -6598,8 +6598,6 @@
/* Unblock any waiting calls */
wake_up_interruptible_all(&priv->wait_command_queue);
- iwl_cancel_deferred_work(priv);
-
/* Wipe out the EXIT_PENDING status bit if we are not actually
* exiting the module */
if (!exit_pending)
@@ -6674,6 +6672,8 @@
mutex_lock(&priv->mutex);
__iwl_down(priv);
mutex_unlock(&priv->mutex);
+
+ iwl_cancel_deferred_work(priv);
}
#define MAX_HW_RESTARTS 5
@@ -9171,10 +9171,9 @@
IWL_DEBUG_INFO("*** UNLOAD DRIVER ***\n");
- mutex_lock(&priv->mutex);
set_bit(STATUS_EXIT_PENDING, &priv->status);
- __iwl_down(priv);
- mutex_unlock(&priv->mutex);
+
+ iwl_down(priv);
/* Free MAC hash list for ADHOC */
for (i = 0; i < IWL_IBSS_MAC_HASH_SIZE; i++) {
@@ -9233,12 +9232,10 @@
{
struct iwl_priv *priv = pci_get_drvdata(pdev);
- mutex_lock(&priv->mutex);
-
set_bit(STATUS_IN_SUSPEND, &priv->status);
/* Take down the device; powers it off, etc. */
- __iwl_down(priv);
+ iwl_down(priv);
if (priv->mac80211_registered)
ieee80211_stop_queues(priv->hw);
@@ -9247,8 +9244,6 @@
pci_disable_device(pdev);
pci_set_power_state(pdev, PCI_D3hot);
- mutex_unlock(&priv->mutex);
-
return 0;
}
@@ -9306,8 +9301,6 @@
printk(KERN_INFO "Coming out of suspend...\n");
- mutex_lock(&priv->mutex);
-
pci_set_power_state(pdev, PCI_D0);
err = pci_enable_device(pdev);
pci_restore_state(pdev);
@@ -9321,7 +9314,6 @@
pci_write_config_byte(pdev, 0x41, 0x00);
iwl_resume(priv);
- mutex_unlock(&priv->mutex);
return 0;
}