Re: Missing remove event

[Kay Sievers <kay.sievers@vrfy.org>]

On Fri, Dec 30, 2005 at 02:12:50PM -0800, Bill Moseley wrote:
> On Fri, Dec 30, 2005 at 09:52:42PM +0100, Kay Sievers wrote:
> > On Fri, Dec 30, 2005 at 12:40:58PM -0800, Bill Moseley wrote:
> > > Is there anything else I could provide that might help debug this?
> > > 
> > > Does the udev system get hotplug events differently?  That is, would
> > > it make any difference if I switch to using udev?
> > 
> > That's very unlikely to change anything. It looks more like a driver
> > or bus driver issue.
> 
> By driver do you mean prism54?

Yes, that's the first place to ask for already known issues.

> I guess not because it looks more like
> /sbin/hotplug just isn't being run when the card is pulled out in some
> cases.

It's the driver, or the bus driver that causes this event. If hotplug
doesn't run, it's very likey an issue inside the kernel.

> > > > 
> > > > Then plugging the card back in nothing happens.  Manually running
> > > > modprobe prism54 goes through much of the same logging, but the
> > > > lights never come on on the wireless card:
> > 
> > You may ask the driver maintainer if there is a way to work around this,
> > or a known issue. It doesn't look like a hotplug or driver core thing.
> 
> Unfortunately, it's a black box to me.  I was assuming that since it
> wasn't detecting the card removal that it also wasn't then detecting
> the card insertion and that there was something else missing than just
> reloading the drivers (such as powering up the slot??).
> 
> Is there something else to watch besides /sbin/hotplug to see if the
> kernel is detecting the card removal?  Something more low-level I can
> check to see what's happening (or not happening) when the card is
> ejected?

No, not from userspace. As /proc and /sys showed, the device remains in the
kernel, even whern it's physically removed. So you very likely need to
look _in_ the kernel for the problem.

> Sorry for the basic questions.  The hardware has worked so well in the
> past I haven't had the need to understand how all the parts fit
> together. ;)

Yeah, no wonder, it's pretty complex and today no single person can
understand everything that's going on all over the place on modern
operating systems.

Kay


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