linux-kernel - [PATCH 2/9] drm: debugfs: Remove all files automatically on cleanup

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Date:   Sun, 22 Jan 2017 19:11:10 +0100
From:   Noralf Trønnes <noralf@...nnes.org>
To:     dri-devel@...ts.freedesktop.org, devicetree@...r.kernel.org
Cc:     thomas.petazzoni@...e-electrons.com, linux-kernel@...r.kernel.org,
        Noralf Trønnes <noralf@...nnes.org>
Subject: [PATCH 2/9] drm: debugfs: Remove all files automatically on cleanup

Instead of having the drivers call drm_debugfs_remove_files() in
their drm_driver->debugfs_cleanup hook, do it automatically by
traversing minor->debugfs_list.
Also use debugfs_remove_recursive() so drivers who add their own
debugfs files don't have to keep track of them for removal.

Signed-off-by: Noralf Trønnes <noralf@...nnes.org>
---
 drivers/gpu/drm/drm_debugfs.c | 17 +++++++++++++++--
 1 file changed, 15 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/drm_debugfs.c b/drivers/gpu/drm/drm_debugfs.c
index 37fd612..0510ce2 100644
--- a/drivers/gpu/drm/drm_debugfs.c
+++ b/drivers/gpu/drm/drm_debugfs.c
@@ -218,6 +218,19 @@ int drm_debugfs_remove_files(const struct drm_info_list *files, int count,
 }
 EXPORT_SYMBOL(drm_debugfs_remove_files);
 
+static void drm_debugfs_remove_all_files(struct drm_minor *minor)
+{
+	struct drm_info_node *node, *tmp;
+
+	mutex_lock(&minor->debugfs_lock);
+	list_for_each_entry_safe(node, tmp, &minor->debugfs_list, list) {
+		debugfs_remove(node->dent);
+		list_del(&node->list);
+		kfree(node);
+	}
+	mutex_unlock(&minor->debugfs_lock);
+}
+
 /**
  * Cleanup the debugfs filesystem resources.
  *
@@ -245,9 +258,9 @@ int drm_debugfs_cleanup(struct drm_minor *minor)
 		}
 	}
 
-	drm_debugfs_remove_files(drm_debugfs_list, DRM_DEBUGFS_ENTRIES, minor);
+	drm_debugfs_remove_all_files(minor);
 
-	debugfs_remove(minor->debugfs_root);
+	debugfs_remove_recursive(minor->debugfs_root);
 	minor->debugfs_root = NULL;
 
 	return 0;
-- 
2.10.2