drm/client: Remove drm_client_framebuffer_delete()

Release client buffers with drm_client_buffer_delete() instead of
drm_client_framebuffer_delete(). The latter is just a tiny wrapper
around the former.

Move the test for !buffer into drm_client_buffer_delete(), although
all callers appear to always have a valid pointer.

v2:
- test for !buffer before deref-ing pointer (Jocelyn, Dan)

Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de>
Reviewed-by: Jocelyn Falempe <jfalempe@redhat.com>
Tested-by: Francesco Valla <francesco@valla.it>
Link: https://patch.msgid.link/20251027121042.143588-6-tzimmermann@suse.de

6 files changed, 24 insertions, 28 deletions

diff --git a/drivers/gpu/drm/clients/drm_log.c b/drivers/gpu/drm/clients/drm_log.c
index 24b08fdcb57a..c2ddc57b538e 100644
--- a/drivers/gpu/drm/clients/drm_log.c
+++ b/drivers/gpu/drm/clients/drm_log.c
@@ -272,7 +272,7 @@ static void drm_log_init_client(struct drm_log *dlog)
 
 err_failed_commit:
 	for (i = 0; i < n_modeset; i++)
-		drm_client_framebuffer_delete(dlog->scanout[i].buffer);
+		drm_client_buffer_delete(dlog->scanout[i].buffer);
 
 err_nomodeset:
 	kfree(dlog->scanout);
@@ -286,7 +286,7 @@ static void drm_log_free_scanout(struct drm_client_dev *client)
 
 	if (dlog->n_scanout) {
 		for (i = 0; i < dlog->n_scanout; i++)
-			drm_client_framebuffer_delete(dlog->scanout[i].buffer);
+			drm_client_buffer_delete(dlog->scanout[i].buffer);
 		dlog->n_scanout = 0;
 		kfree(dlog->scanout);
 		dlog->scanout = NULL;
diff --git a/drivers/gpu/drm/drm_client.c b/drivers/gpu/drm/drm_client.c
index 0aa56c4b912b..b4e37bb2041b 100644
--- a/drivers/gpu/drm/drm_client.c
+++ b/drivers/gpu/drm/drm_client.c
@@ -177,11 +177,19 @@ void drm_client_release(struct drm_client_dev *client)
 }
 EXPORT_SYMBOL(drm_client_release);
 
-static void drm_client_buffer_delete(struct drm_client_buffer *buffer)
+/**
+ * drm_client_buffer_delete - Delete a client buffer
+ * @buffer: DRM client buffer
+ */
+void drm_client_buffer_delete(struct drm_client_buffer *buffer)
 {
-	struct drm_gem_object *gem = buffer->fb->obj[0];
+	struct drm_gem_object *gem;
 	int ret;
 
+	if (!buffer)
+		return;
+
+	gem = buffer->fb->obj[0];
 	drm_gem_vunmap(gem, &buffer->map);
 
 	ret = drm_mode_rmfb(buffer->client->dev, buffer->fb->base.id, buffer->client->file);
@@ -193,6 +201,7 @@ static void drm_client_buffer_delete(struct drm_client_buffer *buffer)
 
 	kfree(buffer);
 }
+EXPORT_SYMBOL(drm_client_buffer_delete);
 
 static struct drm_client_buffer *
 drm_client_buffer_create(struct drm_client_dev *client, u32 width, u32 height,
@@ -376,7 +385,7 @@ EXPORT_SYMBOL(drm_client_buffer_vunmap);
  *
  * This function creates a &drm_client_buffer which consists of a
  * &drm_framebuffer backed by a dumb buffer.
- * Call drm_client_framebuffer_delete() to free the buffer.
+ * Call drm_client_buffer_delete() to free the buffer.
  *
  * Returns:
  * Pointer to a client buffer or an error pointer on failure.
@@ -421,19 +430,6 @@ err_drm_mode_destroy_dumb:
 EXPORT_SYMBOL(drm_client_framebuffer_create);
 
 /**
- * drm_client_framebuffer_delete - Delete a client framebuffer
- * @buffer: DRM client buffer (can be NULL)
- */
-void drm_client_framebuffer_delete(struct drm_client_buffer *buffer)
-{
-	if (!buffer)
-		return;
-
-	drm_client_buffer_delete(buffer);
-}
-EXPORT_SYMBOL(drm_client_framebuffer_delete);
-
-/**
  * drm_client_framebuffer_flush - Manually flush client framebuffer
  * @buffer: DRM client buffer (can be NULL)
  * @rect: Damage rectangle (if NULL flushes all)
diff --git a/drivers/gpu/drm/drm_fbdev_dma.c b/drivers/gpu/drm/drm_fbdev_dma.c
index c6196293e424..6216de1446c1 100644
--- a/drivers/gpu/drm/drm_fbdev_dma.c
+++ b/drivers/gpu/drm/drm_fbdev_dma.c
@@ -55,7 +55,7 @@ static void drm_fbdev_dma_fb_destroy(struct fb_info *info)
 	drm_fb_helper_fini(fb_helper);
 
 	drm_client_buffer_vunmap(fb_helper->buffer);
-	drm_client_framebuffer_delete(fb_helper->buffer);
+	drm_client_buffer_delete(fb_helper->buffer);
 	drm_client_release(&fb_helper->client);
 }
 
@@ -88,7 +88,7 @@ static void drm_fbdev_dma_shadowed_fb_destroy(struct fb_info *info)
 	vfree(shadow);
 
 	drm_client_buffer_vunmap(fb_helper->buffer);
-	drm_client_framebuffer_delete(fb_helper->buffer);
+	drm_client_buffer_delete(fb_helper->buffer);
 	drm_client_release(&fb_helper->client);
 }
 
@@ -324,7 +324,7 @@ err_drm_client_buffer_vunmap:
 	fb_helper->buffer = NULL;
 	drm_client_buffer_vunmap(buffer);
 err_drm_client_buffer_delete:
-	drm_client_framebuffer_delete(buffer);
+	drm_client_buffer_delete(buffer);
 	return ret;
 }
 EXPORT_SYMBOL(drm_fbdev_dma_driver_fbdev_probe);
diff --git a/drivers/gpu/drm/drm_fbdev_shmem.c b/drivers/gpu/drm/drm_fbdev_shmem.c
index 51573058df6f..520c2218e5dc 100644
--- a/drivers/gpu/drm/drm_fbdev_shmem.c
+++ b/drivers/gpu/drm/drm_fbdev_shmem.c
@@ -63,7 +63,7 @@ static void drm_fbdev_shmem_fb_destroy(struct fb_info *info)
 	drm_fb_helper_fini(fb_helper);
 
 	drm_client_buffer_vunmap(fb_helper->buffer);
-	drm_client_framebuffer_delete(fb_helper->buffer);
+	drm_client_buffer_delete(fb_helper->buffer);
 	drm_client_release(&fb_helper->client);
 }
 
@@ -204,7 +204,7 @@ err_drm_client_buffer_vunmap:
 	fb_helper->buffer = NULL;
 	drm_client_buffer_vunmap(buffer);
 err_drm_client_buffer_delete:
-	drm_client_framebuffer_delete(buffer);
+	drm_client_buffer_delete(buffer);
 	return ret;
 }
 EXPORT_SYMBOL(drm_fbdev_shmem_driver_fbdev_probe);
diff --git a/drivers/gpu/drm/drm_fbdev_ttm.c b/drivers/gpu/drm/drm_fbdev_ttm.c
index ccf460fbc1f0..7f7c88461228 100644
--- a/drivers/gpu/drm/drm_fbdev_ttm.c
+++ b/drivers/gpu/drm/drm_fbdev_ttm.c
@@ -50,7 +50,7 @@ static void drm_fbdev_ttm_fb_destroy(struct fb_info *info)
 	fb_deferred_io_cleanup(info);
 	drm_fb_helper_fini(fb_helper);
 	vfree(shadow);
-	drm_client_framebuffer_delete(fb_helper->buffer);
+	drm_client_buffer_delete(fb_helper->buffer);
 
 	drm_client_release(&fb_helper->client);
 }
@@ -200,7 +200,7 @@ int drm_fbdev_ttm_driver_fbdev_probe(struct drm_fb_helper *fb_helper,
 	screen_buffer = vzalloc(screen_size);
 	if (!screen_buffer) {
 		ret = -ENOMEM;
-		goto err_drm_client_framebuffer_delete;
+		goto err_drm_client_buffer_delete;
 	}
 
 	info = drm_fb_helper_alloc_info(fb_helper);
@@ -233,10 +233,10 @@ err_drm_fb_helper_release_info:
 	drm_fb_helper_release_info(fb_helper);
 err_vfree:
 	vfree(screen_buffer);
-err_drm_client_framebuffer_delete:
+err_drm_client_buffer_delete:
 	fb_helper->fb = NULL;
 	fb_helper->buffer = NULL;
-	drm_client_framebuffer_delete(buffer);
+	drm_client_buffer_delete(buffer);
 	return ret;
 }
 EXPORT_SYMBOL(drm_fbdev_ttm_driver_fbdev_probe);
diff --git a/include/drm/drm_client.h b/include/drm/drm_client.h
index b01fc2a21f09..ffc4013b2e18 100644
--- a/include/drm/drm_client.h
+++ b/include/drm/drm_client.h
@@ -195,7 +195,7 @@ struct drm_client_buffer {
 
 struct drm_client_buffer *
 drm_client_framebuffer_create(struct drm_client_dev *client, u32 width, u32 height, u32 format);
-void drm_client_framebuffer_delete(struct drm_client_buffer *buffer);
+void drm_client_buffer_delete(struct drm_client_buffer *buffer);
 int drm_client_framebuffer_flush(struct drm_client_buffer *buffer, struct drm_rect *rect);
 int drm_client_buffer_vmap_local(struct drm_client_buffer *buffer,
 				 struct iosys_map *map_copy);