REGRESSION for RT2561/RT61 in 2.6.33

REGRESSION for RT2561/RT61 in 2.6.33

[Alan Stern]

Gertjan:

Sorry to bother you again, but I have run across a new bug affecting
my rt2561s card.  It appeared in 2.6.33-rc1 and is still present in 
-rc3.  (This is with CONFIG_CFG80211_DEFAULT_PS disabled, not that it 
should make any difference now.)

The card doesn't work.  Although the firmware load appears to
succeed, "iwconfig wlan0" says no wireless extensions present.

The only clue I can offer is that "rmmod rt61pci" hangs in 
wiphy_unregister() during the wait_event() loop near the start, because 
rdev->opencount is equal to -1.  This suggests a refcounting imbalance 
of some sort.

Alan Stern

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Re: REGRESSION for RT2561/RT61 in 2.6.33

[Johannes Berg]

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Alan,

> The card doesn't work.  Although the firmware load appears to
> succeed, "iwconfig wlan0" says no wireless extensions present.

You need to set CONFIG_CFG80211_WEXT (it is default y).

> The only clue I can offer is that "rmmod rt61pci" hangs in 
> wiphy_unregister() during the wait_event() loop near the start,
> because 
> rdev->opencount is equal to -1.  This suggests a refcounting imbalance
> 
> of some sort.

Good point, that's a bug that will go away with CONFIG_CFG80211_WEXT,
I'll send a fix.

johannes

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Re: REGRESSION for RT2561/RT61 in 2.6.33

[Alan Stern]

On Mon, 11 Jan 2010, Johannes Berg wrote:

> Alan,
> 
> > The card doesn't work.  Although the firmware load appears to
> > succeed, "iwconfig wlan0" says no wireless extensions present.
> 
> You need to set CONFIG_CFG80211_WEXT (it is default y).
> 
> > The only clue I can offer is that "rmmod rt61pci" hangs in 
> > wiphy_unregister() during the wait_event() loop near the start,
> > because 
> > rdev->opencount is equal to -1.  This suggests a refcounting imbalance
> > 
> > of some sort.
> 
> Good point, that's a bug that will go away with CONFIG_CFG80211_WEXT,
> I'll send a fix.

Many thanks.  I'll test the patch and the config option tonight and
report back tomorrow.

Alan Stern