Re: [RFC PATCH] usb: host: xhci: allow __GFP_FS in dma allocation

Alan Stern
2019-05-23T14:01:56Z

On Wed, 22 May 2019, Oliver Neukum wrote:

> On Mi, 2019-05-22 at 10:56 -0400, Alan Stern wrote:
> > On Wed, 22 May 2019, Oliver Neukum wrote:
> >
> > > I agree with the problem, but I fail to see why this issue would be
> > > specific to USB. Shouldn't this be done in the device core layer?
> >
> > Only for drivers that are on the block-device writeback path. The
> > device core doesn't know which drivers these are.
>
> Neither does USB know. It is very hard to predict or even tell which
> devices are block device drivers. I think we must assume that
> any device may be affected.

All right. Would you like to submit a patch?

Alan Stern