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, 1 insertions, 0 deletions

diff --git a/drivers/net/wireless/iwlwifi/iwl3945-base.c b/drivers/net/wireless/iwlwifi/iwl3945-base.c
index 0e5a1ca30334..54daa38ecba3 100644
--- a/drivers/net/wireless/iwlwifi/iwl3945-base.c
+++ b/drivers/net/wireless/iwlwifi/iwl3945-base.c
@@ -3847,6 +3847,7 @@ static int iwl3945_init_drv(struct iwl_priv *priv)
         INIT_LIST_HEAD(&priv->free_frames);
 
         mutex_init(&priv->mutex);
+        mutex_init(&priv->sync_cmd_mutex);
 
         /* Clear the driver's (not device's) station table */
         iwl_clear_stations_table(priv);