iwlwifi: enable serialization of synchronous commands

Until now it was only possible to have one synchronous command running at
any time. If a synchronous command is in progress when a second request
arrives then the second command will fail. Create a new mutex specific for
this purpose to only allow one synchronous command at a time, but enable
other commands to wait instead of fail if a synchronous command is in
progress.

Signed-off-by: Reinette Chatre <reinette.chatre@intel.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

1 files changed, 2 insertions, 0 deletions

diff --git a/drivers/net/wireless/iwlwifi/iwl-tx.c b/drivers/net/wireless/iwlwifi/iwl-tx.c
index d8c11f955e42..38655ad8f43c 100644
--- a/drivers/net/wireless/iwlwifi/iwl-tx.c
+++ b/drivers/net/wireless/iwlwifi/iwl-tx.c
@@ -1238,6 +1238,8 @@ void iwl_tx_cmd_complete(struct iwl_priv *priv, struct iwl_rx_mem_buffer *rxb)
 
         if (!(meta->flags & CMD_ASYNC)) {
                 clear_bit(STATUS_HCMD_ACTIVE, &priv->status);
+                IWL_DEBUG_INFO(priv, "Clearing HCMD_ACTIVE for command %s \n",
+                               get_cmd_string(cmd->hdr.cmd));
                 wake_up_interruptible(&priv->wait_command_queue);
         }
 }