iwlwifi: change the default behavior of watchdog timer

The current default watchdog timer is enabled, but we are seeing issues on
legacy devices. So change the default setting of watchdog timer to per
device based. But user still can use the "wd_disable" module parameter
to overwrite the system setting

Cc: stable@vger.kernel.org #3.0+
Signed-off-by: Wey-Yi Guy <wey-yi.w.guy@intel.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

diff --git a/drivers/net/wireless/iwlwifi/iwl-1000.c b/drivers/net/wireless/iwlwifi/iwl-1000.c
index e12b48c2cff6ab71e097d38c9632eeb11044bed0..dd008b0e6417a3b3e15679399252c53af9af990d 100644 (file)
--- a/drivers/net/wireless/iwlwifi/iwl-1000.c
+++ b/drivers/net/wireless/iwlwifi/iwl-1000.c
@@ -191,6 +191,7 @@ static struct iwl_base_params iwl1000_base_params = {
        .chain_noise_scale = 1000,
        .wd_timeout = IWL_DEF_WD_TIMEOUT,
        .max_event_log_size = 128,
+       .wd_disable = true,
 };
 static struct iwl_ht_params iwl1000_ht_params = {
        .ht_greenfield_support = true,

diff --git a/drivers/net/wireless/iwlwifi/iwl-5000.c b/drivers/net/wireless/iwlwifi/iwl-5000.c
index c511c98a89a81284e03f621705cbd09736616297..f55fb2d1af52f3891e8d29bc7a21ab193b7f243f 100644 (file)
--- a/drivers/net/wireless/iwlwifi/iwl-5000.c
+++ b/drivers/net/wireless/iwlwifi/iwl-5000.c
@@ -364,6 +364,7 @@ static struct iwl_base_params iwl5000_base_params = {
        .wd_timeout = IWL_LONG_WD_TIMEOUT,
        .max_event_log_size = 512,
        .no_idle_support = true,
+       .wd_disable = true,
 };
 static struct iwl_ht_params iwl5000_ht_params = {
        .ht_greenfield_support = true,

diff --git a/drivers/net/wireless/iwlwifi/iwl-agn.c b/drivers/net/wireless/iwlwifi/iwl-agn.c
index f5564514868ebeb66385ea4a9e098778475bc399..bacc06c95e7ac798449e11ca883e5b5dc1def717 100644 (file)
--- a/drivers/net/wireless/iwlwifi/iwl-agn.c
+++ b/drivers/net/wireless/iwlwifi/iwl-agn.c
@@ -3498,9 +3498,10 @@ MODULE_PARM_DESC(plcp_check, "Check plcp health (default: 1 [enabled])");
 module_param_named(ack_check, iwlagn_mod_params.ack_check, bool, S_IRUGO);
 MODULE_PARM_DESC(ack_check, "Check ack health (default: 0 [disabled])");
 
-module_param_named(wd_disable, iwlagn_mod_params.wd_disable, bool, S_IRUGO);
+module_param_named(wd_disable, iwlagn_mod_params.wd_disable, int, S_IRUGO);
 MODULE_PARM_DESC(wd_disable,
-               "Disable stuck queue watchdog timer (default: 0 [enabled])");
+               "Disable stuck queue watchdog timer 0=system default, "
+               "1=disable, 2=enable (default: 0)");
 
 /*
  * set bt_coex_active to true, uCode will do kill/defer

diff --git a/drivers/net/wireless/iwlwifi/iwl-core.c b/drivers/net/wireless/iwlwifi/iwl-core.c
index 001fdf140abbb72de6d12fe95dac3d8211158ff0..fcf54160e4ed51b3f89a84447898c7948acaaf59 100644 (file)
--- a/drivers/net/wireless/iwlwifi/iwl-core.c
+++ b/drivers/net/wireless/iwlwifi/iwl-core.c
@@ -1810,11 +1810,23 @@ void iwl_setup_watchdog(struct iwl_priv *priv)
 {
        unsigned int timeout = priv->cfg->base_params->wd_timeout;
 
-       if (timeout && !iwlagn_mod_params.wd_disable)
-               mod_timer(&priv->watchdog,
-                         jiffies + msecs_to_jiffies(IWL_WD_TICK(timeout)));
-       else
-               del_timer(&priv->watchdog);
+       if (!iwlagn_mod_params.wd_disable) {
+               /* use system default */
+               if (timeout && !priv->cfg->base_params->wd_disable)
+                       mod_timer(&priv->watchdog,
+                               jiffies +
+                               msecs_to_jiffies(IWL_WD_TICK(timeout)));
+               else
+                       del_timer(&priv->watchdog);
+       } else {
+               /* module parameter overwrite default configuration */
+               if (timeout && iwlagn_mod_params.wd_disable == 2)
+                       mod_timer(&priv->watchdog,
+                               jiffies +
+                               msecs_to_jiffies(IWL_WD_TICK(timeout)));
+               else
+                       del_timer(&priv->watchdog);
+       }
 }
 
 /**

diff --git a/drivers/net/wireless/iwlwifi/iwl-core.h b/drivers/net/wireless/iwlwifi/iwl-core.h
index 137da33807044bedd162a501a65454037abce49f..f2fc288f3dd31f5068e1bb29fbe3307fa1d2045d 100644 (file)
--- a/drivers/net/wireless/iwlwifi/iwl-core.h
+++ b/drivers/net/wireless/iwlwifi/iwl-core.h
@@ -113,6 +113,7 @@ struct iwl_lib_ops {
  * @shadow_reg_enable: HW shadhow register bit
  * @no_idle_support: do not support idle mode
  * @hd_v2: v2 of enhanced sensitivity value, used for 2000 series and up
+ * wd_disable: disable watchdog timer
  */
 struct iwl_base_params {
        int eeprom_size;
@@ -134,6 +135,7 @@ struct iwl_base_params {
        const bool shadow_reg_enable;
        const bool no_idle_support;
        const bool hd_v2;
+       const bool wd_disable;
 };
 /*
  * @advanced_bt_coexist: support advanced bt coexist

diff --git a/drivers/net/wireless/iwlwifi/iwl-shared.h b/drivers/net/wireless/iwlwifi/iwl-shared.h
index 1f7a93c67c45ed67998389ac406917875e826125..14eaf37ce3b1c6a06fdad12d9cc74371274ba894 100644 (file)
--- a/drivers/net/wireless/iwlwifi/iwl-shared.h
+++ b/drivers/net/wireless/iwlwifi/iwl-shared.h
@@ -120,7 +120,7 @@ extern struct iwl_mod_params iwlagn_mod_params;
  * @restart_fw: restart firmware, default = 1
  * @plcp_check: enable plcp health check, default = true
  * @ack_check: disable ack health check, default = false
- * @wd_disable: enable stuck queue check, default = false
+ * @wd_disable: enable stuck queue check, default = 0
  * @bt_coex_active: enable bt coex, default = true
  * @led_mode: system default, default = 0
  * @no_sleep_autoadjust: disable autoadjust, default = true
@@ -141,7 +141,7 @@ struct iwl_mod_params {
        int restart_fw;
        bool plcp_check;
        bool ack_check;
-       bool wd_disable;
+       int  wd_disable;
        bool bt_coex_active;
        int led_mode;
        bool no_sleep_autoadjust;