On Tue, Sep 22, 2015 at 05:24:29PM +0200, Gerd Hoffmann wrote:
> > > +int virtgpu_gem_prime_mmap(struct drm_gem_object *obj,
> > > + struct vm_area_struct *area)
> > > +{
> > > + WARN_ONCE(1, "not implemented");
> > > + return ENOSYS;
> >
> > This can get called by userspace, so please don't WARN here. Also missing
> > negate sign:
> >
> > return -ENOSYS;
>
> Hmm now checkpatch throws a warning at me:
>
> <quote>
> WARNING: ENOSYS means 'invalid syscall nr' and nothing else
> #12: FILE: drivers/gpu/drm/virtio/virtgpu_prime.c:70:
> + return -ENOSYS;
> </quote>
>
> I guess I should use something else then (here and elsewhere in the
> file)? Maybe -EINVAL? Other suggestions?
-ENODEV is what we occasionally pick. drm is fairly creative at errno
abuse, e.g. we already use -ENOENT to signal any kind of lookup failure in
ioctls (even if the fd itself is obviously there so not possible that the
fd isn't there).
Cheers, Daniel
--
Daniel Vetter
Software Engineer, Intel Corporation
http://blog.ffwll.ch
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