From 2ed81710ccc0ccebe177481b8d4ac584f9c2b569 Mon Sep 17 00:00:00 2001
From: Johannes Berg <johannes.berg@intel.com>
Date: Sat, 28 Jan 2012 08:30:52 -0800
Subject: [PATCH] iwlwifi: always restrict scan dwell in P2P
Whenever the PAN (P2P) context is active, it
has timers in the uCode that prevent sleep,
so scanning can't be out of channel for more
than the beacon interval programmed into the
device.
Before this patch, a full scan including any
passive channels when P2P was active would
stall forever because it wouldn't find time
to execute the passive requests (for default
beacon intervals of 100 TU.)
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>
---
drivers/net/wireless/iwlwifi/iwl-scan.c | 21 ++++++++++++++++++---
1 file changed, 18 insertions(+), 3 deletions(-)
diff --git a/drivers/net/wireless/iwlwifi/iwl-scan.c b/drivers/net/wireless/iwlwifi/iwl-scan.c
index 2aea20bf0f109..7f2e3a1c80efe 100644
--- a/drivers/net/wireless/iwlwifi/iwl-scan.c
+++ b/drivers/net/wireless/iwlwifi/iwl-scan.c
@@ -414,10 +414,25 @@ static u16 iwl_limit_dwell(struct iwl_priv *priv, u16 dwell_time)
for_each_context(priv, ctx) {
u16 value;
- if (!iwl_is_associated_ctx(ctx))
- continue;
- if (ctx->staging.dev_type == RXON_DEV_TYPE_P2P)
+ switch (ctx->staging.dev_type) {
+ case RXON_DEV_TYPE_P2P:
+ /* no timing constraints */
continue;
+ case RXON_DEV_TYPE_ESS:
+ default:
+ /* timing constraints if associated */
+ if (!iwl_is_associated_ctx(ctx))
+ continue;
+ break;
+ case RXON_DEV_TYPE_CP:
+ case RXON_DEV_TYPE_2STA:
+ /*
+ * These seem to always have timers for TBTT
+ * active in uCode even when not associated yet.
+ */
+ break;
+ }
+
value = ctx->beacon_int;
if (!value)
value = IWL_PASSIVE_DWELL_BASE;