Re: [Bug #14015] pty regressed again, breaking expect and gcc'stestsuite

From: Linus Torvalds
Date: Fri Sep 04 2009 - 15:20:02 EST

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.


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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