How to hot unplug?

How to hot unplug?

[ming deng]

When a USB device is detached, I want to do something to clear up, like 
unmount the directory for USB Mass Storage devices. Is there any 
function in hotplug supporting that?

cheers,

Ming



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Re: How to hot unplug?

[David Brownell]

ming deng wrote:
> When a USB device is detached, I want to do something to clear up, like 
> unmount the directory for USB Mass Storage devices. Is there any 
> function in hotplug supporting that?

You get a notification that the device was removed,
but so far nothing uses it.  Feel free to develop
appropriate patches.  In the case of unmounting,
I'd look at the issues for mounting devices first.
(My expectation is that the 2.5 driverfs and disk
model unification work will make that workable.)

One thing that folk have wanted to do is unload
drivers that are no longer needed.  Although there's
a lot of email on linux-kernel about module unload
races, the real reason that's not done is that the
kernel doesn't track which drivers are needed:  only
which are in curreng use.  Having userspace guess
such stuff is error prone at best.

- Dave




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Re: How to hot unplug?

[ming deng]

David Brownell wrote:

> ming deng wrote:
>
>> When a USB device is detached, I want to do something to clear up, 
>> like unmount the directory for USB Mass Storage devices. Is there any 
>> function in hotplug supporting that?
>
>
> You get a notification that the device was removed,
> but so far nothing uses it.  Feel free to develop
> appropriate patches.  In the case of unmounting,
> I'd look at the issues for mounting devices first.
> (My expectation is that the 2.5 driverfs and disk
> model unification work will make that workable.)
>
thanks. And I found out $REMOVER works. But can someone tell me the 
rationale behind using $REMOVER instead of using "remove"?

cheers,

Ming



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Re: How to hot unplug?

[Stephen Williams]

mingd@oeone.com said:
> thanks. And I found out $REMOVER works. But can someone tell me the
> rationale behind using $REMOVER instead of using "remove"? 

The REMOVER variable is set to be a command to execute when the
device is removed. The shell script equivalent of a function pointer:-)

This is very much faster then all the lookups and matching that is
done on device add, and is easily tailored to the specific device,
as the device add script can set whatever REMOVER is appropriate.
It is also compatible with the default behavior of ignoring remove.
-- 
Steve Williams                "The woods are lovely, dark and deep.
steve at icarus.com           But I have promises to keep,
steve at picturel.com         and lines to code before I sleep,
http://www.picturel.com       And lines to code before I sleep."

abuse@xo.com
uce@ftc.gov




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