Re: [PATCH 2/8] USB: change locking for device-level autosuspend

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On Mon, 11 Jan 2010, Oliver Neukum wrote:

> Am Freitag, 8. Januar 2010 18:56:19 schrieb Alan Stern:
> > This patch (as1323) changes the locking requirements for
> > usb_autosuspend_device(), usb_autoresume_device(), and
> > usb_try_autosuspend_device().  This isn't a very important change;
> > mainly it's meant to make the locking more uniform.
> 
> This however affects memory allocation and access to user space.
> You cannot access user space and memory must be allocated with
> GFP_NOIO.
> This should be documented and we need to audit the core.

I don't understand.  Can you explain more fully?

Alan Stern

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