tty: Fix an ircomm warning and note another bug

Roel Kluin noted that line is unsigned so one test is unneccessary. Also
add a warning for another flaw I noticed while making this change.

Signed-off-by: Alan Cox <alan@redhat.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

diff --git a/net/irda/ircomm/ircomm_tty.c b/net/irda/ircomm/ircomm_tty.c
index e4e2caeb9d82d9d1061e27b64c10476125806846..086d5ef098fd0b541359c8bd8448075406ef05cf 100644 (file)
--- a/net/irda/ircomm/ircomm_tty.c
+++ b/net/irda/ircomm/ircomm_tty.c
@@ -371,9 +371,8 @@ static int ircomm_tty_open(struct tty_struct *tty, struct file *filp)
        IRDA_DEBUG(2, "%s()\n", __func__ );
 
        line = tty->index;
-       if ((line < 0) || (line >= IRCOMM_TTY_PORTS)) {
+       if (line >= IRCOMM_TTY_PORTS)
                return -ENODEV;
-       }
 
        /* Check if instance already exists */
        self = hashbin_lock_find(ircomm_tty, line, NULL);
@@ -405,6 +404,8 @@ static int ircomm_tty_open(struct tty_struct *tty, struct file *filp)
                 * Force TTY into raw mode by default which is usually what
                 * we want for IrCOMM and IrLPT. This way applications will
                 * not have to twiddle with printcap etc.
+                *
+                * Note this is completely usafe and doesn't work properly
                 */
                tty->termios->c_iflag = 0;
                tty->termios->c_oflag = 0;