iwlegacy: do not use interruptible waits

iwlegacy version of fix: commit effd4d9 Author: Johannes Berg <johannes.berg@intel.com> Date: Thu Sep 15 11:46:52 2011 -0700 iwlagn: do not use interruptible waits Since the dawn of its time, iwlwifi has used interruptible waits to wait for synchronous commands and firmware loading. This leads to "interesting" bugs, because it can't actually handle the interruptions; for example when a command sending is interrupted it will assume the command completed fully, and then leave it pending, which leads to all kinds of trouble when the command finishes later. Since there's no easy way to gracefully deal with interruptions, fix the driver to not use interruptible waits. This at least fixes the error iwlagn 0000:02:00.0: Error: Response NULL in 'REPLY_SCAN_ABORT_CMD' I have seen in P2P testing, but it is likely that there are other errors caused by this. Cc: stable@kernel.org # 2.6.39+ Signed-off-by: Stanislaw Gruszka <sgruszka@redhat.com> Signed-off-by: John W. Linville <linville@tuxdriver.com>

Author: Stanislaw Gruszka

drivers/net/wireless/iwlegacy/iwl-core.c

@@ -937,7 +937,7 @@ void iwl_legacy_irq_handle_error(struct iwl_priv *priv)
 &priv->contexts[IWL_RXON_CTX_BSS]);
 #endif
 
-wake_up_interruptible(&priv->wait_command_queue);
+wake_up(&priv->wait_command_queue);
 
 /* Keep the restart process from trying to send host
  * commands by clearing the INIT status bit */
@@ -1746,7 +1746,7 @@ int iwl_legacy_force_reset(struct iwl_priv *priv, bool external)
 
 /* Set the FW error flag -- cleared on iwl_down */
 set_bit(STATUS_FW_ERROR, &priv->status);
-wake_up_interruptible(&priv->wait_command_queue);
+wake_up(&priv->wait_command_queue);
 /*
  * Keep the restart process from trying to send host
  * commands by clearing the INIT status bit

drivers/net/wireless/iwlegacy/iwl-hcmd.c

@@ -167,7 +167,7 @@ int iwl_legacy_send_cmd_sync(struct iwl_priv *priv, struct iwl_host_cmd *cmd)
 goto out;
 }
 
-ret = wait_event_interruptible_timeout(priv->wait_command_queue,
+ret = wait_event_timeout(priv->wait_command_queue,
 !test_bit(STATUS_HCMD_ACTIVE, &priv->status),
 HOST_COMPLETE_TIMEOUT);
 if (!ret) {

drivers/net/wireless/iwlegacy/iwl-tx.c

@@ -647,7 +647,7 @@ iwl_legacy_tx_cmd_complete(struct iwl_priv *priv, struct iwl_rx_mem_buffer *rxb)
 clear_bit(STATUS_HCMD_ACTIVE, &priv->status);
 IWL_DEBUG_INFO(priv, "Clearing HCMD_ACTIVE for command %s\n",
  iwl_legacy_get_cmd_string(cmd->hdr.cmd));
-wake_up_interruptible(&priv->wait_command_queue);
+wake_up(&priv->wait_command_queue);
 }
 
 /* Mark as unmapped */

drivers/net/wireless/iwlegacy/iwl3945-base.c

@@ -841,7 +841,7 @@ static void iwl3945_rx_card_state_notif(struct iwl_priv *priv,
 wiphy_rfkill_set_hw_state(priv->hw->wiphy,
 test_bit(STATUS_RF_KILL_HW, &priv->status));
 else
-wake_up_interruptible(&priv->wait_command_queue);
+wake_up(&priv->wait_command_queue);
 }
 
 /**
@@ -2269,7 +2269,7 @@ static void iwl3945_alive_start(struct iwl_priv *priv)
 iwl3945_reg_txpower_periodic(priv);
 
 IWL_DEBUG_INFO(priv, "ALIVE processing complete.\n");
-wake_up_interruptible(&priv->wait_command_queue);
+wake_up(&priv->wait_command_queue);
 
 return;
 
@@ -2300,7 +2300,7 @@ static void __iwl3945_down(struct iwl_priv *priv)
 iwl_legacy_clear_driver_stations(priv);
 
 /* Unblock any waiting calls */
-wake_up_interruptible_all(&priv->wait_command_queue);
+wake_up_all(&priv->wait_command_queue);
 
 /* Wipe out the EXIT_PENDING status bit if we are not actually
  * exiting the module */
@@ -2853,7 +2853,7 @@ static int iwl3945_mac_start(struct ieee80211_hw *hw)
 
 /* Wait for START_ALIVE from ucode. Otherwise callbacks from
  * mac80211 will not be run successfully. */
-ret = wait_event_interruptible_timeout(priv->wait_command_queue,
+ret = wait_event_timeout(priv->wait_command_queue,
 test_bit(STATUS_READY, &priv->status),
 UCODE_READY_TIMEOUT);
 if (!ret) {

drivers/net/wireless/iwlegacy/iwl4965-base.c

@@ -576,7 +576,7 @@ static void iwl4965_rx_card_state_notif(struct iwl_priv *priv,
 wiphy_rfkill_set_hw_state(priv->hw->wiphy,
 test_bit(STATUS_RF_KILL_HW, &priv->status));
 else
-wake_up_interruptible(&priv->wait_command_queue);
+wake_up(&priv->wait_command_queue);
 }
 
 /**
@@ -926,7 +926,7 @@ static void iwl4965_irq_tasklet(struct iwl_priv *priv)
 handled |= CSR_INT_BIT_FH_TX;
 /* Wake up uCode load routine, now that load is complete */
 priv->ucode_write_complete = 1;
-wake_up_interruptible(&priv->wait_command_queue);
+wake_up(&priv->wait_command_queue);
 }
 
 if (inta & ~handled) {
@@ -1795,7 +1795,7 @@ static void iwl4965_alive_start(struct iwl_priv *priv)
 iwl4965_rf_kill_ct_config(priv);
 
 IWL_DEBUG_INFO(priv, "ALIVE processing complete.\n");
-wake_up_interruptible(&priv->wait_command_queue);
+wake_up(&priv->wait_command_queue);
 
 iwl_legacy_power_update_mode(priv, true);
 IWL_DEBUG_INFO(priv, "Updated power mode\n");
@@ -1828,7 +1828,7 @@ static void __iwl4965_down(struct iwl_priv *priv)
 iwl_legacy_clear_driver_stations(priv);
 
 /* Unblock any waiting calls */
-wake_up_interruptible_all(&priv->wait_command_queue);
+wake_up_all(&priv->wait_command_queue);
 
 /* Wipe out the EXIT_PENDING status bit if we are not actually
  * exiting the module */
@@ -2266,7 +2266,7 @@ int iwl4965_mac_start(struct ieee80211_hw *hw)
 
 /* Wait for START_ALIVE from Run Time ucode. Otherwise callbacks from
  * mac80211 will not be run successfully. */
-ret = wait_event_interruptible_timeout(priv->wait_command_queue,
+ret = wait_event_timeout(priv->wait_command_queue,
 test_bit(STATUS_READY, &priv->status),
 UCODE_READY_TIMEOUT);
 if (!ret) {