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

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Date:   Tue, 22 Jan 2019 16:21:24 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Kalle Valo <kvalo@...eaurora.org>,
        Tony Lindgren <tony@...mide.com>,
        linux-wireless@...r.kernel.org
Subject: [PATCH] ti: wlcore: 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: Kalle Valo <kvalo@...eaurora.org>
Cc: Tony Lindgren <tony@...mide.com>
Cc: linux-wireless@...r.kernel.org
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 drivers/net/wireless/ti/wlcore/debugfs.c | 28 ++++--------------------
 drivers/net/wireless/ti/wlcore/debugfs.h | 10 +++------
 2 files changed, 7 insertions(+), 31 deletions(-)

diff --git a/drivers/net/wireless/ti/wlcore/debugfs.c b/drivers/net/wireless/ti/wlcore/debugfs.c
index aeb74e74698e..68acd901d384 100644
--- a/drivers/net/wireless/ti/wlcore/debugfs.c
+++ b/drivers/net/wireless/ti/wlcore/debugfs.c
@@ -1301,11 +1301,10 @@ static const struct file_operations fw_logger_ops = {
 	.llseek = default_llseek,
 };
 
-static int wl1271_debugfs_add_files(struct wl1271 *wl,
-				    struct dentry *rootdir)
+static void wl1271_debugfs_add_files(struct wl1271 *wl,
+				     struct dentry *rootdir)
 {
-	int ret = 0;
-	struct dentry *entry, *streaming;
+	struct dentry *streaming;
 
 	DEBUGFS_ADD(tx_queue_len, rootdir);
 	DEBUGFS_ADD(retry_count, rootdir);
@@ -1330,23 +1329,11 @@ static int wl1271_debugfs_add_files(struct wl1271 *wl,
 	DEBUGFS_ADD(fw_logger, rootdir);
 
 	streaming = debugfs_create_dir("rx_streaming", rootdir);
-	if (!streaming || IS_ERR(streaming))
-		goto err;
 
 	DEBUGFS_ADD_PREFIX(rx_streaming, interval, streaming);
 	DEBUGFS_ADD_PREFIX(rx_streaming, always, streaming);
 
 	DEBUGFS_ADD_PREFIX(dev, mem, rootdir);
-
-	return 0;
-
-err:
-	if (IS_ERR(entry))
-		ret = PTR_ERR(entry);
-	else
-		ret = -ENOMEM;
-
-	return ret;
 }
 
 void wl1271_debugfs_reset(struct wl1271 *wl)
@@ -1367,11 +1354,6 @@ int wl1271_debugfs_init(struct wl1271 *wl)
 	rootdir = debugfs_create_dir(KBUILD_MODNAME,
 				     wl->hw->wiphy->debugfsdir);
 
-	if (IS_ERR(rootdir)) {
-		ret = PTR_ERR(rootdir);
-		goto out;
-	}
-
 	wl->stats.fw_stats = kzalloc(wl->stats.fw_stats_len, GFP_KERNEL);
 	if (!wl->stats.fw_stats) {
 		ret = -ENOMEM;
@@ -1380,9 +1362,7 @@ int wl1271_debugfs_init(struct wl1271 *wl)
 
 	wl->stats.fw_stats_update = jiffies;
 
-	ret = wl1271_debugfs_add_files(wl, rootdir);
-	if (ret < 0)
-		goto out_exit;
+	wl1271_debugfs_add_files(wl, rootdir);
 
 	ret = wlcore_debugfs_init(wl, rootdir);
 	if (ret < 0)
diff --git a/drivers/net/wireless/ti/wlcore/debugfs.h b/drivers/net/wireless/ti/wlcore/debugfs.h
index bf14676e6515..a4952c4f587e 100644
--- a/drivers/net/wireless/ti/wlcore/debugfs.h
+++ b/drivers/net/wireless/ti/wlcore/debugfs.h
@@ -53,19 +53,15 @@ static const struct file_operations name## _ops = {			\
 
 #define DEBUGFS_ADD(name, parent)					\
 	do {								\
-		entry = debugfs_create_file(#name, 0400, parent,	\
-					    wl, &name## _ops);		\
-		if (!entry || IS_ERR(entry))				\
-			goto err;					\
+		debugfs_create_file(#name, 0400, parent,		\
+				    wl, &name## _ops);			\
 	} while (0)
 
 
 #define DEBUGFS_ADD_PREFIX(prefix, name, parent)			\
 	do {								\
-		entry = debugfs_create_file(#name, 0400, parent,	\
+		debugfs_create_file(#name, 0400, parent,		\
 				    wl, &prefix## _## name## _ops);	\
-		if (!entry || IS_ERR(entry))				\
-			goto err;					\
 	} while (0)
 
 #define DEBUGFS_FWSTATS_FILE(sub, name, fmt, struct_type)		\
-- 
2.20.1