Commit 80cace72 authored Jan 30, 2013 by Peter Hurley Committed by Greg Kroah-Hartman Feb 04, 2013

pty: Ignore slave open count for master pty open



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>

parent 7be88b4c

drivers/tty/pty.c

+1 −1

Original line number	Diff line number	Diff line
		@@ -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);

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