linux-kernel - [PATCH] drm/atomic: cleanup debugfs entries on un-registering the driver.

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Date:   Thu, 17 Nov 2016 11:41:29 +0000
From:   Liviu Dudau <Liviu.Dudau@....com>
To:     Rob Clark <robdclark@...il.com>
Cc:     David Airlie <airlied@...ux.ie>,
        Brian Starkey <Brian.Starkey@....com>,
        DRI devel <dri-devel@...ts.freedesktop.org>,
        LKML <linux-kernel@...r.kernel.org>
Subject: [PATCH] drm/atomic: cleanup debugfs entries on un-registering the driver.

Cleanup the debugfs entries created by commit 6559c901cb48 when
the driver's minor gets un-registered. Without it, DRM drivers
compiled as modules cannot be rmmod-ed and modprobed again.

Signed-off-by: Liviu Dudau <Liviu.Dudau@....com>
---
 drivers/gpu/drm/drm_atomic.c  | 7 +++++++
 drivers/gpu/drm/drm_debugfs.c | 9 +++++++++
 include/drm/drm_atomic.h      | 1 +
 3 files changed, 17 insertions(+)

diff --git a/drivers/gpu/drm/drm_atomic.c b/drivers/gpu/drm/drm_atomic.c
index 6773b35..dddf37a 100644
--- a/drivers/gpu/drm/drm_atomic.c
+++ b/drivers/gpu/drm/drm_atomic.c
@@ -1681,6 +1681,13 @@ int drm_atomic_debugfs_init(struct drm_minor *minor)
 			ARRAY_SIZE(drm_atomic_debugfs_list),
 			minor->debugfs_root, minor);
 }
+
+int drm_atomic_debugfs_cleanup(struct drm_minor *minor)
+{
+	return drm_debugfs_remove_files(drm_atomic_debugfs_list,
+					ARRAY_SIZE(drm_atomic_debugfs_list),
+					minor);
+}
 #endif
 
 /*
diff --git a/drivers/gpu/drm/drm_debugfs.c b/drivers/gpu/drm/drm_debugfs.c
index 206a4fe..2e3e46a 100644
--- a/drivers/gpu/drm/drm_debugfs.c
+++ b/drivers/gpu/drm/drm_debugfs.c
@@ -228,6 +228,7 @@ EXPORT_SYMBOL(drm_debugfs_remove_files);
 int drm_debugfs_cleanup(struct drm_minor *minor)
 {
 	struct drm_device *dev = minor->dev;
+	int ret;
 
 	if (!minor->debugfs_root)
 		return 0;
@@ -235,6 +236,14 @@ int drm_debugfs_cleanup(struct drm_minor *minor)
 	if (dev->driver->debugfs_cleanup)
 		dev->driver->debugfs_cleanup(minor);
 
+	if (drm_core_check_feature(dev, DRIVER_ATOMIC)) {
+		ret = drm_atomic_debugfs_cleanup(minor);
+		if (ret) {
+			DRM_ERROR("DRM: Failed to remove atomic debugfs entries\n");
+			return ret;
+		}
+	}
+
 	drm_debugfs_remove_files(drm_debugfs_list, DRM_DEBUGFS_ENTRIES, minor);
 
 	debugfs_remove(minor->debugfs_root);
diff --git a/include/drm/drm_atomic.h b/include/drm/drm_atomic.h
index 2409144..6400df0 100644
--- a/include/drm/drm_atomic.h
+++ b/include/drm/drm_atomic.h
@@ -374,6 +374,7 @@ void drm_state_dump(struct drm_device *dev, struct drm_printer *p);
 #ifdef CONFIG_DEBUG_FS
 struct drm_minor;
 int drm_atomic_debugfs_init(struct drm_minor *minor);
+int drm_atomic_debugfs_cleanup(struct drm_minor *minor);
 #endif
 
 #define for_each_connector_in_state(__state, connector, connector_state, __i) \
-- 
2.10.0