linux-kernel - [ 141/167] [PATCH] b43: only reload config after successful initialization

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Message-Id: <20120509055049.076406734@decadent.org.uk>
Date:	Wed, 09 May 2012 06:52:50 +0100
From:	Ben Hutchings <ben@...adent.org.uk>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:	torvalds@...ux-foundation.org, akpm@...ux-foundation.org,
	alan@...rguk.ukuu.org.uk,
	Seth Forshee <seth.forshee@...onical.com>,
	Felix Fietkau <nbd@...nwrt.org>,
	"John W. Linville" <linville@...driver.com>
Subject: [ 141/167] [PATCH] b43: only reload config after successful initialization

3.2-stable review patch.  If anyone has any objections, please let me know.

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

From: Seth Forshee <seth.forshee@...onical.com>

commit dbdedbdf4fbff3d4962a0786f37aa86dfdc48a7e upstream.

Commit 2a19032 (b43: reload phy and bss settings after core restarts)
introduced an unconditional call to b43_op_config() at the end of
b43_op_start(). When firmware fails to load this can wedge the system.
There's no need to reload the configuration after a failed
initialization anyway, so only make the call if initialization was
successful.

BugLink: http://bugs.launchpad.net/bugs/950295
Cc: Felix Fietkau <nbd@...nwrt.org>
Signed-off-by: Seth Forshee <seth.forshee@...onical.com>
Signed-off-by: John W. Linville <linville@...driver.com>
Signed-off-by: Ben Hutchings <ben@...adent.org.uk>
---
 drivers/net/wireless/b43/main.c |   10 ++++++++--
 1 file changed, 8 insertions(+), 2 deletions(-)

diff --git a/drivers/net/wireless/b43/main.c b/drivers/net/wireless/b43/main.c
index c79e663..e4d6dc2 100644
--- a/drivers/net/wireless/b43/main.c
+++ b/drivers/net/wireless/b43/main.c
@@ -4827,8 +4827,14 @@ static int b43_op_start(struct ieee80211_hw *hw)
  out_mutex_unlock:
 	mutex_unlock(&wl->mutex);
 
-	/* reload configuration */
-	b43_op_config(hw, ~0);
+	/*
+	 * Configuration may have been overwritten during initialization.
+	 * Reload the configuration, but only if initialization was
+	 * successful. Reloading the configuration after a failed init
+	 * may hang the system.
+	 */
+	if (!err)
+		b43_op_config(hw, ~0);
 
 	return err;
 }
-- 
1.7.10



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