On Fri, 2018-01-12 at 10:53 -0500, Alan Stern wrote:
> On Fri, 12 Jan 2018, Benjamin Herrenschmidt wrote:
>
> > The current code tries to test for bits that are masked out by
> > usb_endpoint_maxp(). Instead, use the proper accessor to access
> > the new high bandwidth bits.
> >
> > Signed-off-by: Benjamin Herrenschmidt <[email protected]>
> > ---
>
> Shouldn't this fix be queued for the stable kernels too?
Not sure, I'll let you decide. I noticed that by code inspection ages
ago, and posted the fix at least 2 or 3 times already but nobody picked
it up so I left it in my series and keep re-posting it :-) The bug
doesn't actually affect me.
Cheers,
Ben.
> Alan Stern
>
> > drivers/usb/gadget/udc/core.c | 2 +-
> > 1 file changed, 1 insertion(+), 1 deletion(-)
> >
> > diff --git a/drivers/usb/gadget/udc/core.c b/drivers/usb/gadget/udc/core.c
> > index 1b3efb14aec7..ac0541529499 100644
> > --- a/drivers/usb/gadget/udc/core.c
> > +++ b/drivers/usb/gadget/udc/core.c
> > @@ -912,7 +912,7 @@ int usb_gadget_ep_match_desc(struct usb_gadget *gadget,
> > return 0;
> >
> > /* "high bandwidth" works only at high speed */
> > - if (!gadget_is_dualspeed(gadget) && usb_endpoint_maxp(desc) & (3<<11))
> > + if (!gadget_is_dualspeed(gadget) && usb_endpoint_maxp_mult(desc) > 1)
> > return 0;
> >
> > switch (type) {
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