linux-kernel - [055/121] iwl4965: reset firmware after rfkill off

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Date:	Sun, 08 Sep 2013 03:52:01 +0100
From:	Ben Hutchings <ben@...adent.org.uk>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org
CC:	akpm@...ux-foundation.org,
	"John W. Linville" <linville@...driver.com>,
	"Stanislaw Gruszka" <sgruszka@...hat.com>
Subject: [055/121] iwl4965: reset firmware after rfkill off

3.2.51-rc1 review patch.  If anyone has any objections, please let me know.

------------------

From: Stanislaw Gruszka <sgruszka@...hat.com>

commit 788f7a56fce1bcb2067b62b851a086fca48a0056 upstream.

Using rfkill switch can make firmware unstable, what cause various
Microcode errors and kernel warnings. Reseting firmware just after
rfkill off (radio on) helped with that.

Resolve:
https://bugzilla.redhat.com/show_bug.cgi?id=977053

Reported-and-tested-by: Justin Pearce <whitefox@...rdianfox.net>
Signed-off-by: Stanislaw Gruszka <sgruszka@...hat.com>
Signed-off-by: John W. Linville <linville@...driver.com>
[bwh: Backported to 3.2: adjust filenames, context, naming]
Signed-off-by: Ben Hutchings <ben@...adent.org.uk>
---
 drivers/net/wireless/iwlegacy/iwl4965-base.c | 10 +++++-----
 drivers/net/wireless/iwlegacy/iwl-core.c     |  1 +
 2 files changed, 6 insertions(+), 5 deletions(-)

--- a/drivers/net/wireless/iwlegacy/iwl4965-base.c
+++ b/drivers/net/wireless/iwlegacy/iwl4965-base.c
@@ -868,12 +868,12 @@ static void iwl4965_irq_tasklet(struct i
 		 * is killed. Hence update the killswitch state here. The
 		 * rfkill handler will care about restarting if needed.
 		 */
-		if (!test_bit(STATUS_ALIVE, &priv->status)) {
-			if (hw_rf_kill)
-				set_bit(STATUS_RF_KILL_HW, &priv->status);
-			else
-				clear_bit(STATUS_RF_KILL_HW, &priv->status);
+		if (hw_rf_kill) {
+			set_bit(STATUS_RF_KILL_HW, &priv->status);
+		} else {
+			clear_bit(STATUS_RF_KILL_HW, &priv->status);
 			wiphy_rfkill_set_hw_state(priv->hw->wiphy, hw_rf_kill);
+			iwl_legacy_force_reset(priv, true);
 		}
 
 		handled |= CSR_INT_BIT_RF_KILL;
--- a/drivers/net/wireless/iwlegacy/iwl-core.c
+++ b/drivers/net/wireless/iwlegacy/iwl-core.c
@@ -1757,6 +1757,7 @@ int iwl_legacy_force_reset(struct iwl_pr
 
 	return 0;
 }
+EXPORT_SYMBOL(iwl_legacy_force_reset);
 
 int
 iwl_legacy_mac_change_interface(struct ieee80211_hw *hw,

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