From: Jiri Slaby <jslaby@xxxxxxx>
tty->index (named here as line) is set up in initialize_tty_struct.
The value is checked in get_tty_driver for the found driver as:
if (device < base || device >= base + p->num)
continue;
*index = device - base;
So index/line can never be more than driver->num. Hence remove this
test from uart_open.
Signed-off-by: Jiri Slaby <jslaby@xxxxxxx>
Cc: Alan Cox <alan@xxxxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxx>
---
drivers/tty/serial/serial_core.c | 9 ---------
1 files changed, 0 insertions(+), 9 deletions(-)
diff --git a/drivers/tty/serial/serial_core.c b/drivers/tty/serial/serial_core.c
index 55965d5..69d0000 100644
--- a/drivers/tty/serial/serial_core.c
+++ b/drivers/tty/serial/serial_core.c
@@ -1530,15 +1530,6 @@ static int uart_open(struct tty_struct *tty, struct file *filp)
pr_debug("uart_open(%d) called\n", line);
/*
- * tty->driver->num won't change, so we won't fail here with
- * tty->driver_data set to something non-NULL (and therefore
- * we won't get caught by uart_close()).
- */
- retval = -ENODEV;
- if (line >= tty->driver->num)
- goto fail;
-
- /*
* We take the semaphore inside uart_get to guarantee that we won't
* be re-entered while allocating the state structure, or while we
* request any IRQs that the driver may need. This also has the nice
--
1.7.4.2
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