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Re: kern/50810: Kernel page fault trap in ugenclose()
The following reply was made to PR kern/50810; it has been noted by GNATS.
From: Andreas Gustafsson <gson%gson.org@localhost>
To: Nick Hudson <skrll%netbsd.org@localhost>
Subject: Re: kern/50810: Kernel page fault trap in ugenclose()
Date: Mon, 22 Feb 2016 11:01:56 +0200
Nick Hudson wrote:
> > I guess the answer is that there is no canonical way, and that
> > each function is just checking whatever field it is going to
> > dereference (if it is checking at all).
> Huh? check either or both...
That's what I'm saying - if all choices are equally correct, then by
definition, none of them is canonical.
> Can you work out where in sane it's doing the
> ioctl(USB_SET_ALTINTERFACE) and
> why it's choosing to do it before closing the endpoints of the existing
> interface? #
> I'm curious what behaviour it's expecting.
From sane-backends-1.0.25/sanei/sanei_usb.c, around line 2154:
/* This call seems to be required by Linux xhci driver
* even though it should be a no-op. Without it, the
* host or driver does not reset it's data toggle bit.
* We intentionally ignore the return val */
=> sanei_usb_set_altinterface (dn, devices[dn].alt_setting);
Andreas Gustafsson, gson%gson.org@localhost
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