linux-kernel - [PATCH v2 09/16] wl1251: fix channel switching in monitor mode

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Message-Id: <1386494714-21070-10-git-send-email-pali.rohar@gmail.com>
Date:	Sun,  8 Dec 2013 10:25:07 +0100
From:	Pali Rohár <pali.rohar@...il.com>
To:	Luciano Coelho <luca@...lho.fi>,
	"John W. Linville" <linville@...driver.com>
Cc:	linux-wireless@...r.kernel.org, netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org, freemangordon@....bg,
	aaro.koskinen@....fi, pavel@....cz, sre@...g0.de,
	joni.lapilainen@...il.com,
	Johannes Berg <johannes@...solutions.net>,
	Felipe Contreras <felipe.contreras@...il.com>,
	David Gnedt <david.gnedt@...izone.at>,
	Pali Rohár <pali.rohar@...il.com>
Subject: [PATCH v2 09/16] wl1251: fix channel switching in monitor mode

From: David Gnedt <david.gnedt@...izone.at>

Use the ENABLE_RX command for channel switching when no interface is present
(monitor mode only).
The advantage of ENABLE_RX is that it leaves the tx data path disabled in
firmware, whereas the usual JOIN command seems to transmit some frames at
firmware level.

Signed-off-by: David Gnedt <david.gnedt@...izone.at>
Signed-off-by: Pali Rohár <pali.rohar@...il.com>
---
 drivers/net/wireless/ti/wl1251/main.c |   15 +++++++++++++--
 1 file changed, 13 insertions(+), 2 deletions(-)

diff --git a/drivers/net/wireless/ti/wl1251/main.c b/drivers/net/wireless/ti/wl1251/main.c
index 1223bc6..b6f11b8 100644
--- a/drivers/net/wireless/ti/wl1251/main.c
+++ b/drivers/net/wireless/ti/wl1251/main.c
@@ -616,8 +616,19 @@ static int wl1251_op_config(struct ieee80211_hw *hw, u32 changed)
 	if (channel != wl->channel) {
 		wl->channel = channel;
 
-		ret = wl1251_join(wl, wl->bss_type, wl->channel,
-				  wl->beacon_int, wl->dtim_period);
+		/*
+		 * Use ENABLE_RX command for channel switching when no
+		 * interface is present (monitor mode only).
+		 * This leaves the tx path disabled in firmware, whereas
+		 * the usual JOIN command seems to transmit some frames
+		 * at firmware level.
+		 */
+		if (wl->vif == NULL) {
+			ret = wl1251_cmd_data_path_rx(wl, wl->channel, 1);
+		} else {
+			ret = wl1251_join(wl, wl->bss_type, wl->channel,
+					  wl->beacon_int, wl->dtim_period);
+		}
 		if (ret < 0)
 			goto out_sleep;
 	}
-- 
1.7.9.5

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