iwlagn: add support for waiting for notifications
In order to implement waiting for notifications,
add a structure that captures the information,
and a list of such structures that will be
traversed when a command is received from the
ucode.
Use sparse checking to make sure calls to the
prepare/wait/cancel functions are always nested
correctly.
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
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-dev.h b/drivers/net/wireless/iwlwifi/iwl-dev.h
index 8dda678..2ec680b 100644
--- a/drivers/net/wireless/iwlwifi/iwl-dev.h
+++ b/drivers/net/wireless/iwlwifi/iwl-dev.h
@@ -34,6 +34,7 @@
#include <linux/pci.h> /* for struct pci_device_id */
#include <linux/kernel.h>
+#include <linux/wait.h>
#include <net/ieee80211_radiotap.h>
#include "iwl-eeprom.h"
@@ -1139,6 +1140,33 @@
*/
#define IWLAGN_EXT_BEACON_TIME_POS 22
+/**
+ * struct iwl_notification_wait - notification wait entry
+ * @list: list head for global list
+ * @fn: function called with the notification
+ * @cmd: command ID
+ *
+ * This structure is not used directly, to wait for a
+ * notification declare it on the stack, and call
+ * iwlagn_init_notification_wait() with appropriate
+ * parameters. Then do whatever will cause the ucode
+ * to notify the driver, and to wait for that then
+ * call iwlagn_wait_notification().
+ *
+ * Each notification is one-shot. If at some point we
+ * need to support multi-shot notifications (which
+ * can't be allocated on the stack) we need to modify
+ * the code for them.
+ */
+struct iwl_notification_wait {
+ struct list_head list;
+
+ void (*fn)(struct iwl_priv *priv, struct iwl_rx_packet *pkt);
+
+ u8 cmd;
+ bool triggered;
+};
+
enum iwl_rxon_context_id {
IWL_RXON_CTX_BSS,
IWL_RXON_CTX_PAN,
@@ -1463,6 +1491,11 @@
struct iwl_bt_notif_statistics delta_statistics_bt;
struct iwl_bt_notif_statistics max_delta_bt;
#endif
+
+ /* notification wait support */
+ struct list_head notif_waits;
+ spinlock_t notif_wait_lock;
+ wait_queue_head_t notif_waitq;
} _agn;
#endif
};