RE: [ipw3945-devel] chaning mode only when interface down?

[Johannes Berg <johannes@sipsolutions.net>]

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On Thu, 2007-08-02 at 14:51 -0400, Dan Williams wrote:

> Well, to be honest none of the drivers before mac80211 required you to
> down the device to change modes.  But they were mostly fullmac, or
> half-mac like ipw2x00.  Since mac80211 has only just become useful in
> the past couple of months for most people, it's not really fair to
> expect versions of NM that were out before mac80211 landed to play nice
> with what mac80211 expects, which is different from what other drivers
> implement.

True.

> Not to say NM shouldn't be fixed for this.  The other problem is that
> there's really not a good way to determine whether the driver is
> actually _ready_ after down it and bringing it back up.  You basically
> have to spin & block until the interface gets IFF_UP set on it again,
> and even then that's not entirely reliable.

Not sure I understand? Drivers can fully well block the userspace task
that is doing the IFF_UP until they're read? bcm43xx does that.

johannes

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