linux-kernel - [PATCH] fbdev: mbx: fix up debugfs file creation

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Date:   Tue, 22 Jan 2019 16:21:15 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Bartlomiej Zolnierkiewicz <b.zolnierkie@...sung.com>,
        dri-devel@...ts.freedesktop.org, linux-fbdev@...r.kernel.org
Subject: [PATCH] fbdev: mbx: fix up debugfs file creation

There is no need to keep the dentries around for the individual debugfs
files, just delete the whole directory all at once at shutdown instead.

This also fixes a tiny memory leak where the memory for the pointers to
the file dentries was never freed when the device shut down, as well as
making the logic of the code a lot simpler.

Cc: Bartlomiej Zolnierkiewicz <b.zolnierkie@...sung.com>
Cc: dri-devel@...ts.freedesktop.org
Cc: linux-fbdev@...r.kernel.org
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 drivers/video/fbdev/mbx/mbxdebugfs.c | 40 +++++++++-------------------
 drivers/video/fbdev/mbx/mbxfb.c      |  2 +-
 2 files changed, 14 insertions(+), 28 deletions(-)

diff --git a/drivers/video/fbdev/mbx/mbxdebugfs.c b/drivers/video/fbdev/mbx/mbxdebugfs.c
index 2bd328883178..52cfe0132b25 100644
--- a/drivers/video/fbdev/mbx/mbxdebugfs.c
+++ b/drivers/video/fbdev/mbx/mbxdebugfs.c
@@ -211,36 +211,22 @@ static const struct file_operations misc_fops = {
 static void mbxfb_debugfs_init(struct fb_info *fbi)
 {
 	struct mbxfb_info *mfbi = fbi->par;
-	struct mbxfb_debugfs_data *dbg;
-
-	dbg = kzalloc(sizeof(struct mbxfb_debugfs_data), GFP_KERNEL);
-	mfbi->debugfs_data = dbg;
-
-	dbg->dir = debugfs_create_dir("mbxfb", NULL);
-	dbg->sysconf = debugfs_create_file("sysconf", 0444, dbg->dir,
-				      fbi, &sysconf_fops);
-	dbg->clock = debugfs_create_file("clock", 0444, dbg->dir,
-				    fbi, &clock_fops);
-	dbg->display = debugfs_create_file("display", 0444, dbg->dir,
-				      fbi, &display_fops);
-	dbg->gsctl = debugfs_create_file("gsctl", 0444, dbg->dir,
-				    fbi, &gsctl_fops);
-	dbg->sdram = debugfs_create_file("sdram", 0444, dbg->dir,
-					fbi, &sdram_fops);
-	dbg->misc = debugfs_create_file("misc", 0444, dbg->dir,
-					fbi, &misc_fops);
+	struct dentry *dir;
+
+	dir = debugfs_create_dir("mbxfb", NULL);
+	mbfi->debugfs_dir = dir;
+
+	debugfs_create_file("sysconf", 0444, dir, fbi, &sysconf_fops);
+	debugfs_create_file("clock", 0444, dir, fbi, &clock_fops);
+	debugfs_create_file("display", 0444, dir, fbi, &display_fops);
+	debugfs_create_file("gsctl", 0444, dir, fbi, &gsctl_fops);
+	debugfs_create_file("sdram", 0444, dir, fbi, &sdram_fops);
+	debugfs_create_file("misc", 0444, dir, fbi, &misc_fops);
 }
 
 static void mbxfb_debugfs_remove(struct fb_info *fbi)
 {
 	struct mbxfb_info *mfbi = fbi->par;
-	struct mbxfb_debugfs_data *dbg = mfbi->debugfs_data;
-
-	debugfs_remove(dbg->misc);
-	debugfs_remove(dbg->sdram);
-	debugfs_remove(dbg->gsctl);
-	debugfs_remove(dbg->display);
-	debugfs_remove(dbg->clock);
-	debugfs_remove(dbg->sysconf);
-	debugfs_remove(dbg->dir);
+
+	debugfs_remove_recursive(mfbi->debugfs_dir);
 }
diff --git a/drivers/video/fbdev/mbx/mbxfb.c b/drivers/video/fbdev/mbx/mbxfb.c
index 539b85da0897..6ded480a69b4 100644
--- a/drivers/video/fbdev/mbx/mbxfb.c
+++ b/drivers/video/fbdev/mbx/mbxfb.c
@@ -74,7 +74,7 @@ struct mbxfb_info {
 
 	u32 pseudo_palette[MAX_PALETTES];
 #ifdef CONFIG_FB_MBX_DEBUG
-	void *debugfs_data;
+	struct dentry *debugfs_dir;
 #endif
 
 };
-- 
2.20.1