linux-kernel - Re: [Bug #14015] pty regressed again, breaking expect and gcc's testsuite

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Message-ID: <alpine.LFD.2.00.0909040917120.4537@eeepc.linux-foundation.org>
Date:	Fri, 4 Sep 2009 09:19:34 -1000 (HST)
From:	Linus Torvalds <torvalds@...ux-foundation.org>
To:	Mikael Pettersson <mikpe@...uu.se>
cc:	"Rafael J. Wysocki" <rjw@...k.pl>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Kernel Testers List <kernel-testers@...r.kernel.org>,
	Alan Cox <alan@...ux.intel.com>, Greg KH <gregkh@...e.de>,
	Andrew Morton <akpm@...ux-foundation.org>,
	OGAWA Hirofumi <hirofumi@...l.parknet.co.jp>
Subject: Re: [Bug #14015] pty regressed again, breaking expect and gcc's
 testsuite



On Fri, 4 Sep 2009, Linus Torvalds wrote:
> 
> I'm sure you already figured the obvious meaning out, but here's a fixed 
> version.

And here's another patch that may also fix this, simply by virtue of 
writing the "\r\n" as a single string, rather than as two characters. That 
way, we should never get into the situation that th '\r' allocates a new 
buffer (larger than one character), and then the later '\n' writing 
decides that we've filled up.

Besides, it's a cleanup. An untested one, naturally.

			Linus

---
 drivers/char/n_tty.c |    3 +--
 1 files changed, 1 insertions(+), 2 deletions(-)

diff --git a/drivers/char/n_tty.c b/drivers/char/n_tty.c
index 973be2f..4e28b35 100644
--- a/drivers/char/n_tty.c
+++ b/drivers/char/n_tty.c
@@ -300,8 +300,7 @@ static int do_output_char(unsigned char c, struct tty_struct *tty, int space)
 			if (space < 2)
 				return -1;
 			tty->canon_column = tty->column = 0;
-			tty_put_char(tty, '\r');
-			tty_put_char(tty, c);
+			tty->ops->write(tty, "\r\n", 2);
 			return 2;
 		}
 		tty->canon_column = tty->column;
--
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