[PATCH 30/44] drm/qxl: Use devm_drm_dev_alloc

[Daniel Vetter]

On Mon, Apr 6, 2020 at 7:29 PM Thomas Zimmermann <tzimmermann at suse.de> wrote:
>
>
>
> Am 03.04.20 um 15:58 schrieb Daniel Vetter:
> > Also need to remove the drm_dev_put from the remove hook.
> >
> > Signed-off-by: Daniel Vetter <daniel.vetter at intel.com>
> > Cc: Dave Airlie <airlied at redhat.com>
> > Cc: Gerd Hoffmann <kraxel at redhat.com>
> > Cc: virtualization at lists.linux-foundation.org
> > Cc: spice-devel at lists.freedesktop.org
> > ---
> >  drivers/gpu/drm/qxl/qxl_drv.c | 15 ++++++++-------
> >  drivers/gpu/drm/qxl/qxl_drv.h |  3 +--
> >  drivers/gpu/drm/qxl/qxl_kms.c | 12 +-----------
> >  3 files changed, 10 insertions(+), 20 deletions(-)
> >
> > diff --git a/drivers/gpu/drm/qxl/qxl_drv.c b/drivers/gpu/drm/qxl/qxl_drv.c
> > index 09102e2efabc..6b4ae4c5fb76 100644
> > --- a/drivers/gpu/drm/qxl/qxl_drv.c
> > +++ b/drivers/gpu/drm/qxl/qxl_drv.c
> > @@ -81,13 +81,16 @@ qxl_pci_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
> >               return -EINVAL; /* TODO: ENODEV ? */
> >       }
> >
> > -     qdev = kzalloc(sizeof(struct qxl_device), GFP_KERNEL);
> > -     if (!qdev)
> > +     qdev = devm_drm_dev_alloc(&pdev->dev, &qxl_driver,
> > +                               struct qxl_device, ddev);
> > +     if (IS_ERR(qdev)) {
> > +             pr_err("Unable to init drm dev");
> >               return -ENOMEM;
> > +     }
>
> My feeling is that it is too early to allocate. Wouldn't it be better to
> first do the pdev and conflicting-fb stuff and allocate right before
> qxl_device_init() ?

It doesn't matter. I can reorder, or I can also not reorder, it'll
have 0 effects on cleanup (all done automatically) or correctness
(it's just a memory allocation, it doesn't do anything).
-Daniel


> Best regards
> Thomas
>
> >
> >       ret = pci_enable_device(pdev);
> >       if (ret)
> > -             goto free_dev;
> > +             return ret;
> >
> >       ret = drm_fb_helper_remove_conflicting_pci_framebuffers(pdev, "qxl");
> >       if (ret)
> > @@ -101,7 +104,7 @@ qxl_pci_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
> >               }
> >       }
> >
> > -     ret = qxl_device_init(qdev, &qxl_driver, pdev);
> > +     ret = qxl_device_init(qdev, pdev);
> >       if (ret)
> >               goto put_vga;
> >
> > @@ -128,8 +131,7 @@ qxl_pci_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
> >               vga_put(pdev, VGA_RSRC_LEGACY_IO);
> >  disable_pci:
> >       pci_disable_device(pdev);
> > -free_dev:
> > -     kfree(qdev);
> > +
> >       return ret;
> >  }
> >
> > @@ -155,7 +157,6 @@ qxl_pci_remove(struct pci_dev *pdev)
> >       drm_atomic_helper_shutdown(dev);
> >       if (is_vga(pdev))
> >               vga_put(pdev, VGA_RSRC_LEGACY_IO);
> > -     drm_dev_put(dev);
> >  }
> >
> >  DEFINE_DRM_GEM_FOPS(qxl_fops);
> > diff --git a/drivers/gpu/drm/qxl/qxl_drv.h b/drivers/gpu/drm/qxl/qxl_drv.h
> > index 435126facc9b..86ac191d9205 100644
> > --- a/drivers/gpu/drm/qxl/qxl_drv.h
> > +++ b/drivers/gpu/drm/qxl/qxl_drv.h
> > @@ -276,8 +276,7 @@ struct qxl_device {
> >  extern const struct drm_ioctl_desc qxl_ioctls[];
> >  extern int qxl_max_ioctl;
> >
> > -int qxl_device_init(struct qxl_device *qdev, struct drm_driver *drv,
> > -                 struct pci_dev *pdev);
> > +int qxl_device_init(struct qxl_device *qdev, struct pci_dev *pdev);
> >  void qxl_device_fini(struct qxl_device *qdev);
> >
> >  int qxl_modeset_init(struct qxl_device *qdev);
> > diff --git a/drivers/gpu/drm/qxl/qxl_kms.c b/drivers/gpu/drm/qxl/qxl_kms.c
> > index 9eed1a375f24..91a34dd835d7 100644
> > --- a/drivers/gpu/drm/qxl/qxl_kms.c
> > +++ b/drivers/gpu/drm/qxl/qxl_kms.c
> > @@ -108,21 +108,13 @@ static void qxl_gc_work(struct work_struct *work)
> >  }
> >
> >  int qxl_device_init(struct qxl_device *qdev,
> > -                 struct drm_driver *drv,
> >                   struct pci_dev *pdev)
> >  {
> >       int r, sb;
> >
> > -     r = drm_dev_init(&qdev->ddev, drv, &pdev->dev);
> > -     if (r) {
> > -             pr_err("Unable to init drm dev");
> > -             goto error;
> > -     }
> > -
> >       qdev->ddev.pdev = pdev;
> >       pci_set_drvdata(pdev, &qdev->ddev);
> >       qdev->ddev.dev_private = qdev;
> > -     drmm_add_final_kfree(&qdev->ddev, qdev);
> >
> >       mutex_init(&qdev->gem.mutex);
> >       mutex_init(&qdev->update_area_mutex);
> > @@ -138,8 +130,7 @@ int qxl_device_init(struct qxl_device *qdev,
> >       qdev->vram_mapping = io_mapping_create_wc(qdev->vram_base, pci_resource_len(pdev, 0));
> >       if (!qdev->vram_mapping) {
> >               pr_err("Unable to create vram_mapping");
> > -             r = -ENOMEM;
> > -             goto error;
> > +             return -ENOMEM;
> >       }
> >
> >       if (pci_resource_len(pdev, 4) > 0) {
> > @@ -293,7 +284,6 @@ int qxl_device_init(struct qxl_device *qdev,
> >       io_mapping_free(qdev->surface_mapping);
> >  vram_mapping_free:
> >       io_mapping_free(qdev->vram_mapping);
> > -error:
> >       return r;
> >  }
> >
> >
>
> --
> Thomas Zimmermann
> Graphics Driver Developer
> SUSE Software Solutions Germany GmbH
> Maxfeldstr. 5, 90409 Nürnberg, Germany
> (HRB 36809, AG Nürnberg)
> Geschäftsführer: Felix Imendörffer
>


-- 
Daniel Vetter
Software Engineer, Intel Corporation
+41 (0) 79 365 57 48 - http://blog.ffwll.ch