On Fri, Sep 18, 2020 at 7:50 PM Matthew Auld
<matthew.william.auld@xxxxxxxxx> wrote:
>
> On Fri, 18 Sep 2020 at 14:25, Daniel Vetter <daniel.vetter@xxxxxxxx> wrote:
> >
> > The big change is device_add so that device_del can auto-cleanup
> > devres resources. This allows us to use devm_drm_dev_alloc, which
> > removes the last user of drm_dev_init.
> >
> > v2: Rebased
> >
> > v3: use devres_open/release_group so we can use devm without real
> > hacks in the driver core or having to create an entire fake bus for
> > testing drivers. Might want to extract this into helpers eventually,
> > maybe as a mock_drm_dev_alloc or test_drm_dev_alloc.
> >
> > v4:
> > - Fix IS_ERR handling (Matt)
> > - Delete surplus put_device() in mock_device_release (intel-gfx-ci)
> >
> > Cc: Matthew Auld <matthew.william.auld@xxxxxxxxx>
> > Reviewed-by: Maarten Lankhorst <maarten.lankhorst@xxxxxxxxxxxxxxx> (v3)
> > Cc: Maarten Lankhorst <maarten.lankhorst@xxxxxxxxxxxxxxx>
> > Signed-off-by: Daniel Vetter <daniel.vetter@xxxxxxxxx>
> > ---
> > .../gpu/drm/i915/selftests/mock_gem_device.c | 44 +++++++++++--------
> > 1 file changed, 25 insertions(+), 19 deletions(-)
> >
> > diff --git a/drivers/gpu/drm/i915/selftests/mock_gem_device.c b/drivers/gpu/drm/i915/selftests/mock_gem_device.c
> > index ac600d395c8f..816f9af15fb3 100644
> > --- a/drivers/gpu/drm/i915/selftests/mock_gem_device.c
> > +++ b/drivers/gpu/drm/i915/selftests/mock_gem_device.c
> > @@ -79,8 +79,6 @@ static void mock_device_release(struct drm_device *dev)
> >
> > out:
> > i915_params_free(&i915->params);
> > - put_device(&i915->drm.pdev->dev);
> > - i915->drm.pdev = NULL;
> > }
> >
> > static struct drm_driver mock_driver = {
> > @@ -128,12 +126,6 @@ struct drm_i915_private *mock_gem_device(void)
> > pdev = kzalloc(sizeof(*pdev), GFP_KERNEL);
> > if (!pdev)
> > return NULL;
> > - i915 = kzalloc(sizeof(*i915), GFP_KERNEL);
> > - if (!i915) {
> > - kfree(pdev);
> > - return NULL;
> > - }
> > -
> > device_initialize(&pdev->dev);
> > pdev->class = PCI_BASE_CLASS_DISPLAY << 16;
> > pdev->dev.release = release_dev;
> > @@ -144,8 +136,29 @@ struct drm_i915_private *mock_gem_device(void)
> > /* HACK to disable iommu for the fake device; force identity mapping */
> > pdev->dev.iommu = &fake_iommu;
> > #endif
> > + err = device_add(&pdev->dev);
> > + if (err) {
> > + kfree(pdev);
> > + return NULL;
> > + }
> > +
> > + if (!devres_open_group(&pdev->dev, NULL, GFP_KERNEL)) {
> > + device_del(&pdev->dev);
> > + return NULL;
> > + }
> > +
> > + i915 = devm_drm_dev_alloc(&pdev->dev, &mock_driver,
> > + struct drm_i915_private, drm);
> > + if (IS_ERR(i915)) {
> > + pr_err("Failed to allocate mock GEM device: err=%d\n", err);
>
> err = PTR_ERR(i915)
Are you sure? We return a pointer here, and callers just expect NULL
when stuff fails (so neither errno nor ptr-encoded errno).
-Daniel
> Reviewed-by: Matthew Auld <matthew.auld@xxxxxxxxx>
--
Daniel Vetter
Software Engineer, Intel Corporation
http://blog.ffwll.ch
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