linux-kernel - [PATCH 2/3] tty: return tty->name directly from tty

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Message-Id: <1427810160-15779-3-git-send-email-linux@rasmusvillemoes.dk>
Date:	Tue, 31 Mar 2015 15:55:58 +0200
From:	Rasmus Villemoes <linux@...musvillemoes.dk>
To:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Jiri Slaby <jslaby@...e.cz>
Cc:	Rasmus Villemoes <linux@...musvillemoes.dk>,
	linux-kernel@...r.kernel.org
Subject: [PATCH 2/3] tty: return tty->name directly from tty_name

All users of tty_name pass the return value (the provided buffer) to
some printf-like function. We can thus avoid the strcpy and, more
importantly, later remove the buf parameter completely, eliminating
the need for some 64 byte stack buffers.

Signed-off-by: Rasmus Villemoes <linux@...musvillemoes.dk>
---
 drivers/tty/tty_io.c | 8 +++-----
 1 file changed, 3 insertions(+), 5 deletions(-)

diff --git a/drivers/tty/tty_io.c b/drivers/tty/tty_io.c
index 5d4a9fd7510a..ab549e7bdaa8 100644
--- a/drivers/tty/tty_io.c
+++ b/drivers/tty/tty_io.c
@@ -235,7 +235,7 @@ static void tty_del_file(struct file *file)
 /**
  *	tty_name	-	return tty naming
  *	@tty: tty structure
- *	@buf: buffer for output
+ *	@buf: unused
  *
  *	Convert a tty structure into a name. The name reflects the kernel
  *	naming policy and if udev is in use may not reflect user space
@@ -246,10 +246,8 @@ static void tty_del_file(struct file *file)
 const char *tty_name(const struct tty_struct *tty, char *buf)
 {
 	if (!tty) /* Hmm.  NULL pointer.  That's fun. */
-		strcpy(buf, "NULL tty");
-	else
-		strcpy(buf, tty->name);
-	return buf;
+		return "NULL tty";
+	return tty->name;
 }
 
 EXPORT_SYMBOL(tty_name);
-- 
2.1.3

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