Re: [PATCH net-next 04/19] net: usb: aqc111: Various callbacks implementation

[Oliver Neukum <oneukum@xxxxxxxx>]

On Di, 2018-10-09 at 15:27 +0200, Bjørn Mork  wrote:
> Oliver Neukum <oneukum@xxxxxxxx> writes:
> 
> > On Fr, 2018-10-05 at 10:24 +0000, Igor Russkikh wrote:
> > > From: Dmitry Bezrukov <dmitry.bezrukov@xxxxxxxxxxxx>
> > > 
> > > Reset, stop callbacks, driver unbind callback.
> > > More register defines required for these callbacks.
> > > 
> > > Signed-off-by: Dmitry Bezrukov <dmitry.bezrukov@xxxxxxxxxxxx>
> > > Signed-off-by: Igor Russkikh <igor.russkikh@xxxxxxxxxxxx>
> > > ---
> > >  drivers/net/usb/aqc111.c |  48 ++++++++++++++++++++++
> > >  drivers/net/usb/aqc111.h | 101 +++++++++++++++++++++++++++++++++++++++++++++++
> > >  2 files changed, 149 insertions(+)
> > > 
> > > diff --git a/drivers/net/usb/aqc111.c b/drivers/net/usb/aqc111.c
> > > index 7f3e5a615750..22bb259d71fb 100644
> > > --- a/drivers/net/usb/aqc111.c
> > > +++ b/drivers/net/usb/aqc111.c
> > > @@ -169,12 +169,60 @@ static int aqc111_bind(struct usbnet *dev, struct usb_interface *intf)
> > >  
> > >  static void aqc111_unbind(struct usbnet *dev, struct usb_interface *intf)
> > >  {
> > > +	u8 reg8;
> > > +	u16 reg16;
> > > +
> > > +	/* Force bz */
> > > +	reg16 = SFR_PHYPWR_RSTCTL_BZ;
> > > +	aqc111_write_cmd_nopm(dev, AQ_ACCESS_MAC, SFR_PHYPWR_RSTCTL,
> > > +			      2, 2, &reg16);
> > 
> > No, I am sorry, you are doing DMA on the kernel stack. That is not
> > allowed. These functions will all have to be fixed.
> 
> Huh?  No, he doesn't.  That's the whole point with
> usbnet_read_cmd_nopm(), isn't it?

Right. Too many indirections for me.
Please disregard my comment.

	Regards
		Oliver