drm: introduce drm_dev_{get/put} functions
Reference counting functions in the kernel typically use get/put suffixes. For maintaining coding style consistency, introduce drm_dev_{get/put} functions. All callers of drm_dev_ref() API have been converted in this patch and hence it has been dropped while the drm_dev_unref() API with non-trivial number of users remains for compatibility. The semantic patch scripts/coccinelle/api/drm-get-put.cocci has been updated with the new helper for conversion of drm_dev_unref() to drm_dev_put() Signed-off-by: Aishwarya Pant <aishpant@gmail.com> Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch> Link: https://patchwork.freedesktop.org/patch/msgid/6babda56134035a98220d5d37a4fd4048df214ce.1506413698.git.aishpant@gmail.com
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@ -286,13 +286,13 @@ struct drm_minor *drm_minor_acquire(unsigned int minor_id)
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spin_lock_irqsave(&drm_minor_lock, flags);
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minor = idr_find(&drm_minors_idr, minor_id);
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if (minor)
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drm_dev_ref(minor->dev);
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drm_dev_get(minor->dev);
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spin_unlock_irqrestore(&drm_minor_lock, flags);
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if (!minor) {
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return ERR_PTR(-ENODEV);
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} else if (drm_dev_is_unplugged(minor->dev)) {
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drm_dev_unref(minor->dev);
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drm_dev_put(minor->dev);
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return ERR_PTR(-ENODEV);
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}
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@ -301,7 +301,7 @@ struct drm_minor *drm_minor_acquire(unsigned int minor_id)
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void drm_minor_release(struct drm_minor *minor)
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{
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drm_dev_unref(minor->dev);
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drm_dev_put(minor->dev);
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}
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/**
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@ -326,11 +326,11 @@ void drm_minor_release(struct drm_minor *minor)
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* When cleaning up a device instance everything needs to be done in reverse:
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* First unpublish the device instance with drm_dev_unregister(). Then clean up
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* any other resources allocated at device initialization and drop the driver's
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* reference to &drm_device using drm_dev_unref().
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* reference to &drm_device using drm_dev_put().
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*
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* Note that the lifetime rules for &drm_device instance has still a lot of
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* historical baggage. Hence use the reference counting provided by
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* drm_dev_ref() and drm_dev_unref() only carefully.
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* drm_dev_get() and drm_dev_put() only carefully.
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*
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* It is recommended that drivers embed &struct drm_device into their own device
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* structure, which is supported through drm_dev_init().
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@ -345,7 +345,7 @@ void drm_minor_release(struct drm_minor *minor)
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* Cleans up all DRM device, calling drm_lastclose().
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*
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* Note: Use of this function is deprecated. It will eventually go away
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* completely. Please use drm_dev_unregister() and drm_dev_unref() explicitly
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* completely. Please use drm_dev_unregister() and drm_dev_put() explicitly
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* instead to make sure that the device isn't userspace accessible any more
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* while teardown is in progress, ensuring that userspace can't access an
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* inconsistent state.
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@ -360,7 +360,7 @@ void drm_put_dev(struct drm_device *dev)
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}
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drm_dev_unregister(dev);
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drm_dev_unref(dev);
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drm_dev_put(dev);
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}
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EXPORT_SYMBOL(drm_put_dev);
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@ -386,7 +386,7 @@ void drm_dev_unplug(struct drm_device *dev)
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mutex_lock(&drm_global_mutex);
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drm_device_set_unplugged(dev);
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if (dev->open_count == 0)
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drm_dev_unref(dev);
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drm_dev_put(dev);
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mutex_unlock(&drm_global_mutex);
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}
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EXPORT_SYMBOL(drm_dev_unplug);
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@ -475,8 +475,8 @@ static void drm_fs_inode_free(struct inode *inode)
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* initialization sequence to make sure userspace can't access an inconsistent
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* state.
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*
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* The initial ref-count of the object is 1. Use drm_dev_ref() and
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* drm_dev_unref() to take and drop further ref-counts.
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* The initial ref-count of the object is 1. Use drm_dev_get() and
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* drm_dev_put() to take and drop further ref-counts.
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*
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* Note that for purely virtual devices @parent can be NULL.
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*
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@ -626,8 +626,8 @@ EXPORT_SYMBOL(drm_dev_fini);
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* initialization sequence to make sure userspace can't access an inconsistent
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* state.
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*
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* The initial ref-count of the object is 1. Use drm_dev_ref() and
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* drm_dev_unref() to take and drop further ref-counts.
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* The initial ref-count of the object is 1. Use drm_dev_get() and
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* drm_dev_put() to take and drop further ref-counts.
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*
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* Note that for purely virtual devices @parent can be NULL.
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*
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@ -670,36 +670,49 @@ static void drm_dev_release(struct kref *ref)
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}
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/**
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* drm_dev_ref - Take reference of a DRM device
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* drm_dev_get - Take reference of a DRM device
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* @dev: device to take reference of or NULL
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*
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* This increases the ref-count of @dev by one. You *must* already own a
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* reference when calling this. Use drm_dev_unref() to drop this reference
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* reference when calling this. Use drm_dev_put() to drop this reference
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* again.
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*
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* This function never fails. However, this function does not provide *any*
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* guarantee whether the device is alive or running. It only provides a
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* reference to the object and the memory associated with it.
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*/
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void drm_dev_ref(struct drm_device *dev)
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void drm_dev_get(struct drm_device *dev)
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{
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if (dev)
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kref_get(&dev->ref);
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}
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EXPORT_SYMBOL(drm_dev_ref);
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EXPORT_SYMBOL(drm_dev_get);
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/**
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* drm_dev_unref - Drop reference of a DRM device
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* drm_dev_put - Drop reference of a DRM device
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* @dev: device to drop reference of or NULL
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*
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* This decreases the ref-count of @dev by one. The device is destroyed if the
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* ref-count drops to zero.
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*/
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void drm_dev_unref(struct drm_device *dev)
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void drm_dev_put(struct drm_device *dev)
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{
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if (dev)
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kref_put(&dev->ref, drm_dev_release);
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}
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EXPORT_SYMBOL(drm_dev_put);
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/**
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* drm_dev_unref - Drop reference of a DRM device
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* @dev: device to drop reference of or NULL
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*
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* This is a compatibility alias for drm_dev_put() and should not be used by new
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* code.
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*/
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void drm_dev_unref(struct drm_device *dev)
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{
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drm_dev_put(dev);
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}
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EXPORT_SYMBOL(drm_dev_unref);
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static int create_compat_control_link(struct drm_device *dev)
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@ -839,7 +852,7 @@ EXPORT_SYMBOL(drm_dev_register);
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*
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* Unregister the DRM device from the system. This does the reverse of
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* drm_dev_register() but does not deallocate the device. The caller must call
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* drm_dev_unref() to drop their final reference.
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* drm_dev_put() to drop their final reference.
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*
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* A special form of unregistering for hotpluggable devices is drm_dev_unplug(),
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* which can be called while there are still open users of @dev.
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@ -318,7 +318,7 @@ struct dma_buf *drm_gem_dmabuf_export(struct drm_device *dev,
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if (IS_ERR(dma_buf))
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return dma_buf;
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drm_dev_ref(dev);
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drm_dev_get(dev);
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drm_gem_object_get(exp_info->priv);
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return dma_buf;
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@ -155,7 +155,7 @@ struct drm_driver {
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* reverse order of the initialization. Similarly to the load
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* hook, this handler is deprecated and its usage should be
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* dropped in favor of an open-coded teardown function at the
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* driver layer. See drm_dev_unregister() and drm_dev_unref()
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* driver layer. See drm_dev_unregister() and drm_dev_put()
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* for the proper way to remove a &struct drm_device.
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*
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* The unload() hook is called right after unregistering
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@ -611,7 +611,8 @@ struct drm_device *drm_dev_alloc(struct drm_driver *driver,
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int drm_dev_register(struct drm_device *dev, unsigned long flags);
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void drm_dev_unregister(struct drm_device *dev);
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void drm_dev_ref(struct drm_device *dev);
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void drm_dev_get(struct drm_device *dev);
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void drm_dev_put(struct drm_device *dev);
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void drm_dev_unref(struct drm_device *dev);
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void drm_put_dev(struct drm_device *dev);
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void drm_dev_unplug(struct drm_device *dev);
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@ -50,6 +50,9 @@ expression object;
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- drm_property_unreference_blob(object)
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+ drm_property_blob_put(object)
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- drm_dev_unref(object)
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+ drm_dev_put(object)
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)
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@r depends on report@
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@ -81,6 +84,8 @@ drm_gem_object_unreference_unlocked(object)
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drm_property_unreference_blob@p(object)
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drm_property_reference_blob@p(object)
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drm_dev_unref@p(object)
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)
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@script:python depends on report@
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