linux-kernel - Re: 2.6.25-rc2 regression in rt61pci wireless driver

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Message-Id: <200802192046.14184.IvDoorn@gmail.com>
Date:	Tue, 19 Feb 2008 20:46:14 +0100
From:	Ivo van Doorn <ivdoorn@...il.com>
To:	chris2553@...glemail.com
Cc:	linux-kernel@...r.kernel.org, linux-wireless@...r.kernel.org,
	rt2400-devel@...ts.sourceforge.net
Subject: Re: 2.6.25-rc2 regression in rt61pci wireless driver

Hi,

[added rt2400-devel (rt2x00 development mailinglist) to the CC list.]

> > > > I have a series of tests I would like to request from you,
> > > > you mentioned you already enabled debugfs, and that is just what we need. ;)
> > > > Please use attached script to create dumps of the hardware register contents.
> > > > 
> > > > There are specific moments that should be dumped:
> > > > - kernel 2.6.24 (last known working version for you).
> > > > - kernel 2.6.25-rc2 (after ifup, before TX dies)
> > > > - kernel 2.6.25-rc2 (after ifup, after TX dies)
> > > >  
> > > 
> > > These diagnostics are attached, with obvious filenames.
> > 
> > Thanks. I think I found something, please test below patch:
> > 
> 
> I've tried the patch but, unfortunately, my wireless LAN still dies after a few pings.

Could you use below patch instead, and make a new dump of the register?
I'm still convinced the breakage occurs in the antenna diversity (or rather, I believe
it attempts a software diversity for your card while in fact it shouldn't).

> The frame dump diagnostics you asked for are attached. This is a fresh dump taken
> tonight running the driver with your patch applied.

Thanks, I think I miss some information in that dump,
but that is okay for now.

Ivo

---

diff --git a/drivers/net/wireless/rt2x00/rt2x00dev.c b/drivers/net/wireless/rt2x00/rt2x00dev.c
index 015738a..65a512f 100644
--- a/drivers/net/wireless/rt2x00/rt2x00dev.c
+++ b/drivers/net/wireless/rt2x00/rt2x00dev.c
@@ -223,7 +223,7 @@ static void rt2x00lib_evaluate_antenna_eval(struct rt2x00_dev *rt2x00dev)
 	 * sample the rssi from the other antenna to make a valid
 	 * comparison between the 2 antennas.
 	 */
-	if ((rssi_curr - rssi_old) > -5 || (rssi_curr - rssi_old) < 5)
+	if (abs(rssi_curr - rssi_old) < 5)
 		return;
 
 	rt2x00dev->link.ant.flags |= ANTENNA_MODE_SAMPLE;
@@ -249,10 +249,10 @@ static void rt2x00lib_evaluate_antenna(struct rt2x00_dev *rt2x00dev)
 	rt2x00dev->link.ant.flags &= ~ANTENNA_TX_DIVERSITY;
 
 	if (rt2x00dev->hw->conf.antenna_sel_rx == 0 &&
-	    rt2x00dev->default_ant.rx != ANTENNA_SW_DIVERSITY)
+	    rt2x00dev->default_ant.rx == ANTENNA_SW_DIVERSITY)
 		rt2x00dev->link.ant.flags |= ANTENNA_RX_DIVERSITY;
 	if (rt2x00dev->hw->conf.antenna_sel_tx == 0 &&
-	    rt2x00dev->default_ant.tx != ANTENNA_SW_DIVERSITY)
+	    rt2x00dev->default_ant.tx == ANTENNA_SW_DIVERSITY)
 		rt2x00dev->link.ant.flags |= ANTENNA_TX_DIVERSITY;
 
 	if (!(rt2x00dev->link.ant.flags & ANTENNA_RX_DIVERSITY) &&

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