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[for-next][PATCH 1/7] ftrace: Clean up __seq_open_private() return check

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  [for-next][PATCH 1/7] ftrace: Clean up __seq_open_private() return check Steven Rostedt <rostedt@goodmis.org> - 2017-04-05 18:30 +0200

#1617117 — [for-next][PATCH 1/7] ftrace: Clean up __seq_open_private() return check

From: "Steven Rostedt (VMware)" <rostedt@goodmis.org>

The return status check of __seq_open_private() is rather strange:

	iter = __seq_open_private();
	if (iter) {
		/* do stuff */
	}

	return iter ? 0 : -ENOMEM;

It makes much more sense to do the return of failure right away:

	iter = __seq_open_private();
	if (!iter)
		return -ENOMEM;

	/* do stuff */

	return 0;

This clean up will make updates to this code a bit nicer.

Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
---
 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 0556a202c055..527c4d3e8d7f 100644
--- a/kernel/trace/ftrace.c
+++ b/kernel/trace/ftrace.c
@@ -3355,12 +3355,13 @@ 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
@@ -3369,13 +3370,14 @@ 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;
 }
 
 /**
-- 
2.10.2

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