[PATCH 2/3] drm/framebuffer: Print task that allocated the fb in debug info.

[Maarten Lankhorst]

This is is very useful to finding sources of leaked framebufers.
The fbcon fb is annotated with [fbcon], to give it a better name
than kworker.

Signed-off-by: Maarten Lankhorst <maarten.lankhorst at linux.intel.com>
---
 drivers/gpu/drm/drm_fb_helper.c   | 1 +
 drivers/gpu/drm/drm_framebuffer.c | 2 ++
 include/drm/drm_framebuffer.h     | 6 ++++++
 3 files changed, 9 insertions(+)

diff --git a/drivers/gpu/drm/drm_fb_helper.c b/drivers/gpu/drm/drm_fb_helper.c
index 04a3a5ce370a..d396d74a7dda 100644
--- a/drivers/gpu/drm/drm_fb_helper.c
+++ b/drivers/gpu/drm/drm_fb_helper.c
@@ -1848,6 +1848,7 @@ static int drm_fb_helper_single_fb_probe(struct drm_fb_helper *fb_helper,
 	if (ret < 0)
 		return ret;
 
+	strcpy(fb_helper->fb->comm, "[fbcon]");
 	return 0;
 }
 
diff --git a/drivers/gpu/drm/drm_framebuffer.c b/drivers/gpu/drm/drm_framebuffer.c
index d63d4c2ac4c8..5a13ff29f4f0 100644
--- a/drivers/gpu/drm/drm_framebuffer.c
+++ b/drivers/gpu/drm/drm_framebuffer.c
@@ -664,6 +664,7 @@ int drm_framebuffer_init(struct drm_device *dev, struct drm_framebuffer *fb,
 	INIT_LIST_HEAD(&fb->filp_head);
 
 	fb->funcs = funcs;
+	strcpy(fb->comm, current->comm);
 
 	ret = __drm_mode_object_add(dev, &fb->base, DRM_MODE_OBJECT_FB,
 				    false, drm_framebuffer_free);
@@ -978,6 +979,7 @@ void drm_framebuffer_print_info(struct drm_printer *p, unsigned int indent,
 	struct drm_format_name_buf format_name;
 	unsigned int i;
 
+	drm_printf_indent(p, indent, "allocated by = %s\n", fb->comm);
 	drm_printf_indent(p, indent, "refcount=%u\n",
 			  drm_framebuffer_read_refcount(fb));
 	drm_printf_indent(p, indent, "format=%s\n",
diff --git a/include/drm/drm_framebuffer.h b/include/drm/drm_framebuffer.h
index dccb897951ba..c50502c656e5 100644
--- a/include/drm/drm_framebuffer.h
+++ b/include/drm/drm_framebuffer.h
@@ -121,6 +121,12 @@ struct drm_framebuffer {
 	 * @base: base modeset object structure, contains the reference count.
 	 */
 	struct drm_mode_object base;
+
+	/**
+	 * @comm: Name of the process allocating the fb, used for fb dumping.
+	 */
+	char comm[TASK_COMM_LEN];
+
 	/**
 	 * @format: framebuffer format information
 	 */
-- 
2.15.1