[PATCH] ipw2200: batch non-user-requested scan result notifications

ipw2200 makes extensive use of background scanning when unassociated or
down.  Unfortunately, the firmware sends scan completed events many
times per second, which the driver pushes directly up to userspace.
This needlessly wakes up processes listening for wireless events many
times per second.  Batch together scan completed events for
non-user-requested scans and send them up to userspace every 4 seconds.
Scan completed events resulting from an SIOCSIWSCAN call are pushed up
without delay.

Signed-off-by: Dan Williams <dcbw@redhat.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

1 files changed, 3 insertions, 0 deletions

diff --git a/drivers/net/wireless/ipw2200.h b/drivers/net/wireless/ipw2200.h
index 9c973b96bb42..bec8e37a1738 100644
--- a/drivers/net/wireless/ipw2200.h
+++ b/drivers/net/wireless/ipw2200.h
@@ -1287,6 +1287,8 @@ struct ipw_priv {
 
         struct iw_public_data wireless_data;
 
+        int user_requested_scan;
+
         struct workqueue_struct *workqueue;
 
         struct delayed_work adhoc_check;
@@ -1295,6 +1297,7 @@ struct ipw_priv {
         struct work_struct system_config;
         struct work_struct rx_replenish;
         struct delayed_work request_scan;
+        struct delayed_work scan_event;
         struct work_struct request_passive_scan;
         struct work_struct adapter_restart;
         struct delayed_work rf_kill;