linux-kernel - [PATCH] b43legacy: no need to check return value of debugfs

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Message-Id: <20190122152151.16139-31-gregkh@linuxfoundation.org>
Date:   Tue, 22 Jan 2019 16:21:30 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Larry Finger <Larry.Finger@...inger.net>,
        Kalle Valo <kvalo@...eaurora.org>,
        linux-wireless@...r.kernel.org, b43-dev@...ts.infradead.org
Subject: [PATCH] b43legacy: no need to check return value of debugfs_create functions

When calling debugfs functions, there is no need to ever check the
return value.  The function can work or not, but the code logic should
never do something different based on this.

Cc: Larry Finger <Larry.Finger@...inger.net>
Cc: Kalle Valo <kvalo@...eaurora.org>
Cc: linux-wireless@...r.kernel.org
Cc: b43-dev@...ts.infradead.org
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 .../net/wireless/broadcom/b43legacy/debugfs.c | 35 +++++--------------
 1 file changed, 8 insertions(+), 27 deletions(-)

diff --git a/drivers/net/wireless/broadcom/b43legacy/debugfs.c b/drivers/net/wireless/broadcom/b43legacy/debugfs.c
index 82ef56ed7ca1..8150adee3e34 100644
--- a/drivers/net/wireless/broadcom/b43legacy/debugfs.c
+++ b/drivers/net/wireless/broadcom/b43legacy/debugfs.c
@@ -361,15 +361,13 @@ static void b43legacy_remove_dynamic_debug(struct b43legacy_wldev *dev)
 static void b43legacy_add_dynamic_debug(struct b43legacy_wldev *dev)
 {
 	struct b43legacy_dfsentry *e = dev->dfsentry;
-	struct dentry *d;
 
-#define add_dyn_dbg(name, id, initstate) do {		\
-	e->dyn_debug[id] = (initstate);			\
-	d = debugfs_create_bool(name, 0600, e->subdir,	\
-				&(e->dyn_debug[id]));	\
-	if (!IS_ERR(d))					\
-		e->dyn_debug_dentries[id] = d;		\
-				} while (0)
+#define add_dyn_dbg(name, id, initstate) do {			\
+	e->dyn_debug[id] = (initstate);				\
+	e->dyn_debug_dentries[id] =				\
+		debugfs_create_bool(name, 0600, e->subdir,	\
+				&(e->dyn_debug[id]));		\
+	} while (0)
 
 	add_dyn_dbg("debug_xmitpower", B43legacy_DBG_XMITPOWER, false);
 	add_dyn_dbg("debug_dmaoverflow", B43legacy_DBG_DMAOVERFLOW, false);
@@ -408,29 +406,14 @@ void b43legacy_debugfs_add_device(struct b43legacy_wldev *dev)
 
 	snprintf(devdir, sizeof(devdir), "%s", wiphy_name(dev->wl->hw->wiphy));
 	e->subdir = debugfs_create_dir(devdir, rootdir);
-	if (!e->subdir || IS_ERR(e->subdir)) {
-		if (e->subdir == ERR_PTR(-ENODEV)) {
-			b43legacydbg(dev->wl, "DebugFS (CONFIG_DEBUG_FS) not "
-			       "enabled in kernel config\n");
-		} else {
-			b43legacyerr(dev->wl, "debugfs: cannot create %s directory\n",
-			       devdir);
-		}
-		dev->dfsentry = NULL;
-		kfree(log->log);
-		kfree(e);
-		return;
-	}
 
 #define ADD_FILE(name, mode)	\
 	do {							\
-		struct dentry *d;				\
-		d = debugfs_create_file(__stringify(name),	\
+		e->file_##name.dentry =				\
+			debugfs_create_file(__stringify(name),	\
 					mode, e->subdir, dev,	\
 					&fops_##name.fops);	\
 		e->file_##name.dentry = NULL;			\
-		if (!IS_ERR(d))					\
-			e->file_##name.dentry = d;		\
 	} while (0)
 
 
@@ -492,8 +475,6 @@ void b43legacy_debugfs_log_txstat(struct b43legacy_wldev *dev,
 void b43legacy_debugfs_init(void)
 {
 	rootdir = debugfs_create_dir(KBUILD_MODNAME, NULL);
-	if (IS_ERR(rootdir))
-		rootdir = NULL;
 }
 
 void b43legacy_debugfs_exit(void)
-- 
2.20.1