[Mesa-stable] [Mesa-dev] [PATCH] st/dri: don't expose modifiers in EGL if the driver doesn't implement them

[Emil Velikov]

On 27 September 2017 at 20:27, Juan A. Suarez Romero
<jasuarez at igalia.com> wrote:
> On Wed, 2017-09-27 at 18:09 +0100, Emil Velikov wrote:
>> On 27 September 2017 at 17:28, Marek Olšák <maraeo at gmail.com> wrote:
>> > On Wed, Sep 27, 2017 at 6:22 PM, Emil Velikov <emil.l.velikov at gmail.com> wrote:
>> > > On 27 September 2017 at 16:00, Daniel Stone <daniel at fooishbar.org> wrote:
>> > > > Hi Marek,
>> > > >
>> > > > On 27 September 2017 at 15:55, Marek Olšák <maraeo at gmail.com> wrote:
>> > > > >     if (dmabuf_ret && dmabuf_ret->val.val_bool) {
>> > > > >        uint64_t cap;
>> > > > >
>> > > > >        if (drmGetCap(sPriv->fd, DRM_CAP_PRIME, &cap) == 0 &&
>> > > > >            (cap & DRM_PRIME_CAP_IMPORT)) {
>> > > > >           dri2ImageExtension.createImageFromFds = dri2_from_fds;
>> > > > >           dri2ImageExtension.createImageFromDmaBufs = dri2_from_dma_bufs;
>> > > > >           dri2ImageExtension.createImageFromDmaBufs2 = dri2_from_dma_bufs2;
>> > > > >           dri2ImageExtension.queryDmaBufFormats = dri2_query_dma_buf_formats;
>> > > > > -         dri2ImageExtension.queryDmaBufModifiers =
>> > > > > -                                    dri2_query_dma_buf_modifiers;
>> > > > > +         if (pscreen->query_dmabuf_modifiers) {
>> > > > > +            dri2ImageExtension.queryDmaBufModifiers =
>> > > > > +                                       dri2_query_dma_buf_modifiers;
>> > > > > +         }
>> > > >
>> > > > This should also not expose queryDmaBufFormats, since that is also
>> > > > part of EGL_EXT_image_dma_buf_import_modifiers, which is pretty
>> > > > useless without modifiers.
>> > > >
>> > >
>> > > True, it's useless. Suggestion makes the code a bit confusing though.
>> > > After all EGL already checks that all the entry points are present
>> > > before advertising the extension.
>> > >
>> > > Either way, I think we want this in stable, right?
>> >
>> > Sorry too late, I pushed it.
>> >
>>
>> No need to apologise.
>>
>> > I don't know if stable is affected.
>> >
>>
>> You're right - code was introduced around commit
>> f84bb6a9d91521de6da4c3d1ddd8de456761efaa.
>> The latter of which landed in Mesa 17.2.0-devel
>>
>
> Not sure if I'm understanding correctly. Do you mean we don't need this
> patch in stable?
>
Hmm I misread the version as "17.3.0-devel" ...
Patch is a simple NULL check so it won't hurt to have in 17.2.x

-Emil