Re: [linux-usb-devel] Re: usb-storage not suitable for swapping

[Oliver Neukum]

[..]
> > > Actually it should be an endpoint specific setting.
> >
> > Actually there is no connection to the endpoint from a driver point of
> > view. Any protocol to do data transmission for storage devices uses at
> > least two endpoints. During data transmission using any of these
> > endpoints there's a risk.
>
> So it is a interface specific setting from the drivers point of view.

Yes, that is best.

> > As soon as the device is open we must no longer use GFP_KERNEL. A device
> > specific flag could do that. For 2.4 this probably is the easiest
> > solution. For 2.5 I feel strongly that added parameters to the API calls
> > is the way to go.
>
> One more thing that can be inconsistent at
> different URBs for the same endpoint.

Is that bad ? Different URBs may have different requirements.
An URB needed to do actual block device io needs GFP_NOIO.
An URB needed to export some information through a proc entry may use 
GFP_KERNEL.
There's no need to stress memory management more than we have to.

        Regards
                Oliver

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