Re: [PATCH 26/59] drm/qxl: Use devm_drm_dev_alloc

[Sam Ravnborg <sam@ravnborg.org>]

On Tue, Apr 28, 2020 at 04:00:11PM +0200, Daniel Vetter wrote:
> On Fri, Apr 24, 2020 at 05:09:11PM +0200, Sam Ravnborg wrote:
> > Hi Daniel
> > 
> > On Wed, Apr 15, 2020 at 09:40:01AM +0200, Daniel Vetter wrote:
> > > Also need to remove the drm_dev_put from the remove hook.
> > > 
> > > Acked-by: Gerd Hoffmann <kraxel@redhat.com>
> > > Signed-off-by: Daniel Vetter <daniel.vetter@intel.com>
> > > Cc: Dave Airlie <airlied@redhat.com>
> > > Cc: Gerd Hoffmann <kraxel@redhat.com>
> > > Cc: virtualization@lists.linux-foundation.org
> > > Cc: spice-devel@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;
> > > +	}
> > 
> > The other patches do not add any error message when devm_drm_dev_alloc()
> > fails and driver core will log that driver init failed.
> > 
> > So the pr_err() above should be dropped.
> > I know it comes from qxl_device_init() but that does not make it a good
> > idea.
> 
> Hm I know we're inconsistent here, but some drivers have error logging on
> all branches, some dont. I'm just trying to go with the prevailing style.
> 
> > With this fixed:
> 
> Insisting on this or ok as-is?
OK as-is.

	Sam

> -Daniel
> 
> > Acked-by: Sam Ravnborg <sam@ravnborg.org>
> > 
> > >  
> > >  	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;
> > >  }
> > >  
> > > -- 
> > > 2.25.1
> > > 
> > > _______________________________________________
> > > dri-devel mailing list
> > > dri-devel@lists.freedesktop.org
> > > https://lists.freedesktop.org/mailman/listinfo/dri-devel
> 
> -- 
> Daniel Vetter
> Software Engineer, Intel Corporation
> http://blog.ffwll.ch