On Thu, Feb 11, 2016 at 01:57:30PM -0800, Haixia Shi wrote:
> When a UDL monitor is unplugged, we need to still treat it as a fully
> functional device which just happens to have its connector unplugged.
> This allows user-space to properly deallocate fbs and dumb buffers
> before closing the device.
>
> This drops the "unplugged" flag hack, which puts the device in a
> non-functional state after USB unplug and rejects most operations on
> the device such as ioctls with error -ENODEV.
>
> Signed-off-by: Haixia Shi <hshi@xxxxxxxxxxxx>
> Reviewed-by: Stéphane Marchesin <marcheu@xxxxxxxxxxxx>
> Cc: David Herrmann <dh.herrmann@xxxxxxxxx>
Still missing the in-patch changelog. Please add something like
v2:
.... changes done for v2, and who suggested it
v3:
... changes done for v3.
Thanks, Daniel
> ---
> drivers/gpu/drm/drm_drv.c | 6 ------
> drivers/gpu/drm/drm_fops.c | 2 --
> drivers/gpu/drm/drm_gem.c | 3 ---
> drivers/gpu/drm/drm_ioctl.c | 3 ---
> drivers/gpu/drm/drm_vm.c | 3 ---
> drivers/gpu/drm/udl/udl_connector.c | 2 --
> drivers/gpu/drm/udl/udl_fb.c | 6 ------
> include/drm/drmP.h | 14 --------------
> 8 files changed, 39 deletions(-)
>
> diff --git a/drivers/gpu/drm/drm_drv.c b/drivers/gpu/drm/drm_drv.c
> index 167c8d3..f93ee12 100644
> --- a/drivers/gpu/drm/drm_drv.c
> +++ b/drivers/gpu/drm/drm_drv.c
> @@ -376,9 +376,6 @@ struct drm_minor *drm_minor_acquire(unsigned int minor_id)
>
> if (!minor) {
> return ERR_PTR(-ENODEV);
> - } else if (drm_device_is_unplugged(minor->dev)) {
> - drm_dev_unref(minor->dev);
> - return ERR_PTR(-ENODEV);
> }
>
> return minor;
> @@ -464,9 +461,6 @@ void drm_unplug_dev(struct drm_device *dev)
> drm_minor_unregister(dev, DRM_MINOR_CONTROL);
>
> mutex_lock(&drm_global_mutex);
> -
> - drm_device_set_unplugged(dev);
> -
> if (dev->open_count == 0) {
> drm_put_dev(dev);
> }
> diff --git a/drivers/gpu/drm/drm_fops.c b/drivers/gpu/drm/drm_fops.c
> index 1ea8790..b4332d4 100644
> --- a/drivers/gpu/drm/drm_fops.c
> +++ b/drivers/gpu/drm/drm_fops.c
> @@ -497,8 +497,6 @@ int drm_release(struct inode *inode, struct file *filp)
>
> if (!--dev->open_count) {
> retcode = drm_lastclose(dev);
> - if (drm_device_is_unplugged(dev))
> - drm_put_dev(dev);
> }
> mutex_unlock(&drm_global_mutex);
>
> diff --git a/drivers/gpu/drm/drm_gem.c b/drivers/gpu/drm/drm_gem.c
> index 2e8c77e..c622e32 100644
> --- a/drivers/gpu/drm/drm_gem.c
> +++ b/drivers/gpu/drm/drm_gem.c
> @@ -900,9 +900,6 @@ int drm_gem_mmap(struct file *filp, struct vm_area_struct *vma)
> struct drm_vma_offset_node *node;
> int ret;
>
> - if (drm_device_is_unplugged(dev))
> - return -ENODEV;
> -
> drm_vma_offset_lock_lookup(dev->vma_offset_manager);
> node = drm_vma_offset_exact_lookup_locked(dev->vma_offset_manager,
> vma->vm_pgoff,
> diff --git a/drivers/gpu/drm/drm_ioctl.c b/drivers/gpu/drm/drm_ioctl.c
> index 8ce2a0c..f959074 100644
> --- a/drivers/gpu/drm/drm_ioctl.c
> +++ b/drivers/gpu/drm/drm_ioctl.c
> @@ -695,9 +695,6 @@ long drm_ioctl(struct file *filp,
>
> dev = file_priv->minor->dev;
>
> - if (drm_device_is_unplugged(dev))
> - return -ENODEV;
> -
> is_driver_ioctl = nr >= DRM_COMMAND_BASE && nr < DRM_COMMAND_END;
>
> if (is_driver_ioctl) {
> diff --git a/drivers/gpu/drm/drm_vm.c b/drivers/gpu/drm/drm_vm.c
> index f90bd5f..3a68be4 100644
> --- a/drivers/gpu/drm/drm_vm.c
> +++ b/drivers/gpu/drm/drm_vm.c
> @@ -657,9 +657,6 @@ int drm_legacy_mmap(struct file *filp, struct vm_area_struct *vma)
> struct drm_device *dev = priv->minor->dev;
> int ret;
>
> - if (drm_device_is_unplugged(dev))
> - return -ENODEV;
> -
> mutex_lock(&dev->struct_mutex);
> ret = drm_mmap_locked(filp, vma);
> mutex_unlock(&dev->struct_mutex);
> diff --git a/drivers/gpu/drm/udl/udl_connector.c b/drivers/gpu/drm/udl/udl_connector.c
> index 4709b54..a6d5e21 100644
> --- a/drivers/gpu/drm/udl/udl_connector.c
> +++ b/drivers/gpu/drm/udl/udl_connector.c
> @@ -96,8 +96,6 @@ static int udl_mode_valid(struct drm_connector *connector,
> static enum drm_connector_status
> udl_detect(struct drm_connector *connector, bool force)
> {
> - if (drm_device_is_unplugged(connector->dev))
> - return connector_status_disconnected;
> return connector_status_connected;
> }
>
> diff --git a/drivers/gpu/drm/udl/udl_fb.c b/drivers/gpu/drm/udl/udl_fb.c
> index 200419d..29aca6c 100644
> --- a/drivers/gpu/drm/udl/udl_fb.c
> +++ b/drivers/gpu/drm/udl/udl_fb.c
> @@ -321,12 +321,6 @@ static void udl_fb_imageblit(struct fb_info *info, const struct fb_image *image)
> static int udl_fb_open(struct fb_info *info, int user)
> {
> struct udl_fbdev *ufbdev = info->par;
> - struct drm_device *dev = ufbdev->ufb.base.dev;
> - struct udl_device *udl = dev->dev_private;
> -
> - /* If the USB device is gone, we don't accept new opens */
> - if (drm_device_is_unplugged(udl->ddev))
> - return -ENODEV;
>
> ufbdev->fb_count++;
>
> diff --git a/include/drm/drmP.h b/include/drm/drmP.h
> index d7162cf..40c6099 100644
> --- a/include/drm/drmP.h
> +++ b/include/drm/drmP.h
> @@ -748,7 +748,6 @@ struct drm_device {
> struct drm_minor *control; /**< Control node */
> struct drm_minor *primary; /**< Primary node */
> struct drm_minor *render; /**< Render node */
> - atomic_t unplugged; /**< Flag whether dev is dead */
> struct inode *anon_inode; /**< inode for private address-space */
> char *unique; /**< unique name of the device */
> /*@} */
> @@ -879,19 +878,6 @@ static __inline__ int drm_core_check_feature(struct drm_device *dev,
> return ((dev->driver->driver_features & feature) ? 1 : 0);
> }
>
> -static inline void drm_device_set_unplugged(struct drm_device *dev)
> -{
> - smp_wmb();
> - atomic_set(&dev->unplugged, 1);
> -}
> -
> -static inline int drm_device_is_unplugged(struct drm_device *dev)
> -{
> - int ret = atomic_read(&dev->unplugged);
> - smp_rmb();
> - return ret;
> -}
> -
> static inline bool drm_is_render_client(const struct drm_file *file_priv)
> {
> return file_priv->minor->type == DRM_MINOR_RENDER;
> --
> 2.7.0.rc3.207.g0ac5344
>
> _______________________________________________
> dri-devel mailing list
> dri-devel@xxxxxxxxxxxxxxxxxxxxx
> https://lists.freedesktop.org/mailman/listinfo/dri-devel
--
Daniel Vetter
Software Engineer, Intel Corporation
http://blog.ffwll.ch
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