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pty: Ignore slave open count for master pty open

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Multiple slave pty opens may be performed in parallel with the
master open. Of course, all the slave opens will fail because the
master pty is still locked but during this time the slave pty
count will be artificially greater than 1. This is should not
cause the master pty open to fail.

Signed-off-by: Peter Hurley <peter@hurleysoftware.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Peter Hurley 2013-01-30 12:43:52 -05:00 committed by Greg Kroah-Hartman
parent 7be88b4ccb
commit 80cace7256
1 changed files with 1 additions and 1 deletions
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2
drivers/tty/pty.c
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@ -256,7 +256,7 @@ static int pty_open(struct tty_struct *tty, struct file *filp)
goto out;
if (test_bit(TTY_PTY_LOCK, &tty->link->flags))
goto out;
if (tty->link->count != 1)
if (tty->driver->subtype == PTY_TYPE_SLAVE && tty->link->count != 1)
goto out;
clear_bit(TTY_IO_ERROR, &tty->flags);