Re: [PATCH] USB: Only enable autosuspend by default on certain device classes

On Sat, Aug 18, 2007 at 01:17:31AM -0700, David Brownell wrote:
> On Friday 03 August 2007, Greg KH wrote:
> > > option is for ?** /proc/bus/usb ** files ... note that despite the
> > > strangeness in that text (usbfs still hasn't been "replaced", so
> > > that should say "will eventually be replaced" not "is replaced"),
> > > it's clear that /proc/bus/usb/ and /dev/bus/usb/ are two different
> > > things. ?And thus: ?that Ubuntu's /dev/bus/usb/ setup is flakey.
> > 
> > Hm, if you look at SuSE and Fedora, they too are putting usbfs in
> > /dev/bus/usb/ now, not mounting the filesystem, but using the device
> > nodes for access due to ACLs for local users.
> > 
> > libusb works just fine with this, and I think that all other programs
> > that directly access the old /proc/bus/usb mount are fixed up, with the
> > exception of usbview (but I do have patches floating around for that to
> > solve it.)
> 
> Nobody's submitted any patches to make "lsusb" work with
> this new /dev/bus/usb/ option though.  And there are various
> other programs floating around too.

Hm, there's got to be a patch in the suse tree that fixed this up, I'll
try to find it.

> Was there actually a need to change /proc/bus/usb and thus
> start breaking things?

Yes, /proc/bus/usb can not handle a per-device-node permission setting,
like a "normal" /dev can.

thanks,

greg k-h

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