linux-kernel - [095/129] p54: fix tx feedback status flag check

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Date:	Sat, 18 Sep 2010 12:13:13 -0700
From:	Greg KH <gregkh@...e.de>
To:	linux-kernel@...r.kernel.org, stable@...nel.org
Cc:	stable-review@...nel.org, torvalds@...ux-foundation.org,
	akpm@...ux-foundation.org, alan@...rguk.ukuu.org.uk,
	Christian Lamparter <chunkeey@...glemail.com>,
	"John W. Linville" <linville@...driver.com>
Subject: [095/129] p54: fix tx feedback status flag check

2.6.35-stable review patch.  If anyone has any objections, please let us know.

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

From: Christian Lamparter <chunkeey@...glemail.com>

commit f880c2050f30b23c9b6f80028c09f76e693bf309 upstream.

Michael reported that p54* never really entered power
save mode, even tough it was enabled.

It turned out that upon a power save mode change the
firmware will set a special flag onto the last outgoing
frame tx status (which in this case is almost always the
designated PSM nullfunc frame). This flag confused the
driver; It erroneously reported transmission failures
to the stack, which then generated the next nullfunc.
and so on...

Reported-by: Michael Buesch <mb@...sch.de>
Tested-by: Michael Buesch <mb@...sch.de>
Signed-off-by: Christian Lamparter <chunkeey@...glemail.com>
Signed-off-by: John W. Linville <linville@...driver.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...e.de>

---
 drivers/net/wireless/p54/txrx.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/drivers/net/wireless/p54/txrx.c
+++ b/drivers/net/wireless/p54/txrx.c
@@ -444,7 +444,7 @@ static void p54_rx_frame_sent(struct p54
 	}

 	if (!(info->flags & IEEE80211_TX_CTL_NO_ACK) &&
-	     (!payload->status))
+	     !(payload->status & P54_TX_FAILED))
 		info->flags |= IEEE80211_TX_STAT_ACK;
 	if (payload->status & P54_TX_PSM_CANCELLED)
 		info->flags |= IEEE80211_TX_STAT_TX_FILTERED;

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