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authorWey-Yi Guy <wey-yi.w.guy@intel.com>2011-02-09 18:37:46 +0100
committerWey-Yi Guy <wey-yi.w.guy@intel.com>2011-02-21 19:08:15 +0100
commit491bc292766330473eac4569be5d57f9aeb80112 (patch)
tree4642fd4973e736e1e69b486e91ebf17350157771 /drivers/net/wireless/iwlwifi
parentMerge ssh://master.kernel.org/pub/scm/linux/kernel/git/linville/wireless-2.6 (diff)
downloadlinux-491bc292766330473eac4569be5d57f9aeb80112.tar.xz
linux-491bc292766330473eac4569be5d57f9aeb80112.zip
iwlwifi: Limit number of firmware reload
If device has serious problem and cause firmware can not recover itself. Keep reloading firmware will not help, it can only fill up the syslog and lock up the system because busy reloading. Introduce the limit reload counter, if the reload reach the maximum within the pre-defined duration;stop the reload operation. Signed-off-by: Wey-Yi Guy <wey-yi.w.guy@intel.com>
Diffstat (limited to 'drivers/net/wireless/iwlwifi')
-rw-r--r--drivers/net/wireless/iwlwifi/iwl-core.c22
-rw-r--r--drivers/net/wireless/iwlwifi/iwl-dev.h9
2 files changed, 31 insertions, 0 deletions
diff --git a/drivers/net/wireless/iwlwifi/iwl-core.c b/drivers/net/wireless/iwlwifi/iwl-core.c
index 4ad89389a0a9..977ddfb8c24c 100644
--- a/drivers/net/wireless/iwlwifi/iwl-core.c
+++ b/drivers/net/wireless/iwlwifi/iwl-core.c
@@ -948,6 +948,9 @@ EXPORT_SYMBOL(iwl_print_rx_config_cmd);
*/
void iwl_irq_handle_error(struct iwl_priv *priv)
{
+ unsigned int reload_msec;
+ unsigned long reload_jiffies;
+
/* Set the FW error flag -- cleared on iwl_down */
set_bit(STATUS_FW_ERROR, &priv->status);
@@ -991,6 +994,25 @@ void iwl_irq_handle_error(struct iwl_priv *priv)
* commands by clearing the INIT status bit */
clear_bit(STATUS_READY, &priv->status);
+ /*
+ * If firmware keep reloading, then it indicate something
+ * serious wrong and firmware having problem to recover
+ * from it. Instead of keep trying which will fill the syslog
+ * and hang the system, let's just stop it
+ */
+ reload_jiffies = jiffies;
+ reload_msec = jiffies_to_msecs((long) reload_jiffies -
+ (long) priv->reload_jiffies);
+ priv->reload_jiffies = reload_jiffies;
+ if (reload_msec <= IWL_MIN_RELOAD_DURATION) {
+ priv->reload_count++;
+ if (priv->reload_count >= IWL_MAX_CONTINUE_RELOAD_CNT) {
+ IWL_ERR(priv, "BUG_ON, Stop restarting\n");
+ return;
+ }
+ } else
+ priv->reload_count = 0;
+
if (!test_bit(STATUS_EXIT_PENDING, &priv->status)) {
IWL_DEBUG(priv, IWL_DL_FW_ERRORS,
"Restarting adapter due to uCode error.\n");
diff --git a/drivers/net/wireless/iwlwifi/iwl-dev.h b/drivers/net/wireless/iwlwifi/iwl-dev.h
index ecfbef402781..065615ee040a 100644
--- a/drivers/net/wireless/iwlwifi/iwl-dev.h
+++ b/drivers/net/wireless/iwlwifi/iwl-dev.h
@@ -1110,6 +1110,11 @@ struct iwl_event_log {
/* BT Antenna Coupling Threshold (dB) */
#define IWL_BT_ANTENNA_COUPLING_THRESHOLD (35)
+/* Firmware reload counter and Timestamp */
+#define IWL_MIN_RELOAD_DURATION 1000 /* 1000 ms */
+#define IWL_MAX_CONTINUE_RELOAD_CNT 4
+
+
enum iwl_reset {
IWL_RF_RESET = 0,
IWL_FW_RESET,
@@ -1262,6 +1267,10 @@ struct iwl_priv {
/* force reset */
struct iwl_force_reset force_reset[IWL_MAX_FORCE_RESET];
+ /* firmware reload counter and timestamp */
+ unsigned long reload_jiffies;
+ int reload_count;
+
/* we allocate array of iwl_channel_info for NIC's valid channels.
* Access via channel # using indirect index array */
struct iwl_channel_info *channel_info; /* channel info array */