TTY: remove unneeded tty->index checks

Checking if tty->index is in bounds is not needed. The tty has the
index set in the initial open. This is done in get_tty_driver. And it
can be only in interval <0,driver->num).

So remove the tests which check exactly this interval. Some are
left untouched as they check against the current backing device count.
(Leaving apart that the check is racy in most of the cases.)

Signed-off-by: Jiri Slaby <jslaby@suse.cz>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

1 files changed, 1 insertions, 1 deletions

diff --git a/drivers/tty/synclink.c b/drivers/tty/synclink.c
index 2b2988c779c7..8e518da85fd5 100644
--- a/drivers/tty/synclink.c
+++ b/drivers/tty/synclink.c
@@ -3381,7 +3381,7 @@ static int mgsl_open(struct tty_struct *tty, struct file * filp)
 
         /* verify range of specified line number */     
         line = tty->index;
-        if ((line < 0) || (line >= mgsl_device_count)) {
+        if (line >= mgsl_device_count) {
                 printk("%s(%d):mgsl_open with invalid line #%d.\n",
                         __FILE__,__LINE__,line);
                 return -ENODEV;