linux-kernel - [PATCH] ftrace: refactor to improve readability

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Message-ID: <20150617151412.GA32502@chengyihe-ThinkCentre-M82>
Date:	Wed, 17 Jun 2015 23:14:12 +0800
From:	ChengYi He <chengyihetaipei@...il.com>
To:	Steven Rostedt <rostedt@...dmis.org>,
	Ingo Molnar <mingo@...hat.com>
Cc:	linux-kernel@...r.kernel.org
Subject: [PATCH] ftrace: refactor to improve readability

Return error code immediately after __seq_open_private returns NULL.

Signed-off-by: ChengYi He <chengyihetaipei@...il.com>
---
 kernel/trace/ftrace.c | 24 +++++++++++++-----------
 1 file changed, 13 insertions(+), 11 deletions(-)

diff --git a/kernel/trace/ftrace.c b/kernel/trace/ftrace.c
index 02bece4..8e790b7 100644
--- a/kernel/trace/ftrace.c
+++ b/kernel/trace/ftrace.c
@@ -3269,12 +3269,13 @@ ftrace_avail_open(struct inode *inode, struct file *file)
 		return -ENODEV;
 
 	iter = __seq_open_private(file, &show_ftrace_seq_ops, sizeof(*iter));
-	if (iter) {
-		iter->pg = ftrace_pages_start;
-		iter->ops = &global_ops;
-	}
+	if (!iter)
+		return -ENOMEM;
 
-	return iter ? 0 : -ENOMEM;
+	iter->pg = ftrace_pages_start;
+	iter->ops = &global_ops;
+
+	return 0;
 }
 
 static int
@@ -3283,13 +3284,14 @@ ftrace_enabled_open(struct inode *inode, struct file *file)
 	struct ftrace_iterator *iter;
 
 	iter = __seq_open_private(file, &show_ftrace_seq_ops, sizeof(*iter));
-	if (iter) {
-		iter->pg = ftrace_pages_start;
-		iter->flags = FTRACE_ITER_ENABLED;
-		iter->ops = &global_ops;
-	}
+	if (!iter)
+		return -ENOMEM;
 
-	return iter ? 0 : -ENOMEM;
+	iter->pg = ftrace_pages_start;
+	iter->flags = FTRACE_ITER_ENABLED;
+	iter->ops = &global_ops;
+
+	return 0;
 }
 
 /**
-- 
1.9.1

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