Re: [linux-usb-devel] Re: hotplugging to deal with firmware download

[Brad Hards <bhards@bigpond.net.au>]

On Mon, 3 Jun 2002 00:44, Oliver Neukum wrote:
> Am Sonntag, 2. Juni 2002 01:16 schrieben Sie:
> > On Sun, 2 Jun 2002 02:07, Oliver Neukum wrote:
> > > The problem is that this cannot simply work, because a filesystem may
> > > be mounted by nfs.
> >
> > How is this a problem? You simply need to bring the driver up before you
> > remount the nfs filesystem. If you assume that your firmware is on that
> > filesystem, then you couldn't have mounted it in the first place.
> >
> > What am I missing here?
>
> Paging. As soon as user space is running, dirty pages may be written out
> And in order to run a user space firmware loader, user space must
> be functional, or am I overlooking something?
The software support option requires swap to store to, right? That had better 
be on a local disk, or it doesn't matter whether the firmware is in userspace 
or not. Realistically, swap over a network block device isn't a problem worth 
trying to solve.

> Thus as soon as you do something that allocates memory from user
> space, you may deadlock IMHO.
If you are going to get the firmware from disk (per your alternative 
suggestion), how is that going to help avoid the malloc?

Brad
-- 
http://conf.linux.org.au. 22-25Jan2003. Perth, Australia. Birds in Black.

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