Commit 699390354da6c258b65bf8fa79cfd5feaede50b6
('pty: Ignore slave pty close() if never successfully opened')
introduced a bug with ptys whereby a write() in parallel with an
open() on an existing pty could mistakenly indicate an I/O error.
Only indicate an I/O error if the condition on open() actually exists.
Reported-by: Markus Trippelsdorf <mar...@trippelsdorf.de>
Signed-off-by: Peter Hurley <pe...@hurleysoftware.com>
---
drivers/tty/pty.c | 13 +++++--------
1 file changed, 5 insertions(+), 8 deletions(-)
diff --git a/drivers/tty/pty.c b/drivers/tty/pty.c
index 9c2f1bc..dd08d3d 100644
--- a/drivers/tty/pty.c
+++ b/drivers/tty/pty.c
@@ -238,14 +238,9 @@ static void pty_flush_buffer(struct tty_struct *tty)
static int pty_open(struct tty_struct *tty, struct file *filp)
{
- int retval = -ENODEV;
-
if (!tty || !tty->link)
- goto out;
-
- set_bit(TTY_IO_ERROR, &tty->flags);
+ return -ENODEV;
- retval = -EIO;
if (test_bit(TTY_OTHER_CLOSED, &tty->flags))
goto out;
if (test_bit(TTY_PTY_LOCK, &tty->link->flags))
@@ -256,9 +251,11 @@ static int pty_open(struct tty_struct *tty, struct file
*filp)
clear_bit(TTY_IO_ERROR, &tty->flags);
clear_bit(TTY_OTHER_CLOSED, &tty->link->flags);
set_bit(TTY_THROTTLED, &tty->flags);
- retval = 0;
+ return 0;
+
out:
- return retval;
+ set_bit(TTY_IO_ERROR, &tty->flags);
+ return -EIO;
}
static void pty_set_termios(struct tty_struct *tty,
--
1.8.1.2
--
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