linux-kernel - [PATCH 1/2] tty: TIOCGSOFTCAR/SSOFTCAR on pty is wron

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Message-ID: <20080826195247.55a91d76@lxorguk.ukuu.org.uk>
Date:	Tue, 26 Aug 2008 19:52:47 +0100
From:	Alan Cox <alan@...rguk.ukuu.org.uk>
To:	torvalds@...l.org, linux-kernel@...r.kernel.org
Subject: [PATCH 1/2] tty: TIOCGSOFTCAR/SSOFTCAR on pty is wron

The termios settings ioctls on a pty should affect the bound tty side not
the pty. The SOFTCAR ioctls use the wrong device file.

Signed-off-by: Alan Cox <alan@...hat.com>
---

 drivers/char/tty_ioctl.c |    6 ++++--
 1 files changed, 4 insertions(+), 2 deletions(-)


diff --git a/drivers/char/tty_ioctl.c b/drivers/char/tty_ioctl.c
index ea9fc5d..bf34e45 100644
--- a/drivers/char/tty_ioctl.c
+++ b/drivers/char/tty_ioctl.c
@@ -937,12 +937,14 @@ int tty_mode_ioctl(struct tty_struct *tty, struct file *file,
 			return 0;
 #endif
 	case TIOCGSOFTCAR:
-		return put_user(C_CLOCAL(tty) ? 1 : 0,
+		/* FIXME: for correctness we may need to take the termios
+		   lock here - review */
+		return put_user(C_CLOCAL(real_tty) ? 1 : 0,
 						(int __user *)arg);
 	case TIOCSSOFTCAR:
 		if (get_user(arg, (unsigned int __user *) arg))
 			return -EFAULT;
-		return tty_change_softcar(tty, arg);
+		return tty_change_softcar(real_tty, arg);
 	default:
 		return -ENOIOCTLCMD;
 	}
--
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