Current serial core driver doesn't support compat_ioctl
due to which 32-bit application is not able to send
ioctls to driver on a 64-bit platform.
Added compat_ioctl support in serial core to handle
ioctls from 32-bit applications on a 64-bit platform.
Signed-off-by: Viken Dadhaniya <quic_vdadhani@xxxxxxxxxxx>
---
drivers/tty/serial/serial_core.c | 17 +++++++++++++++++
1 file changed, 17 insertions(+)
diff --git a/drivers/tty/serial/serial_core.c b/drivers/tty/serial/serial_core.c
index b9fbbee598b8..5ffa0798db3b 100644
--- a/drivers/tty/serial/serial_core.c
+++ b/drivers/tty/serial/serial_core.c
@@ -1601,6 +1601,22 @@ uart_ioctl(struct tty_struct *tty, unsigned int cmd, unsigned long arg)
return ret;
}
+/**
+ * uart_compat_ioctl: uart compat IOCTL function.
+ * @tty: pointer to tty structure.
+ * @cmd: command code passed by user-space.
+ * @arg: argument passed by user-space.
+ *
+ * This function will call normal uart IOCTL.
+ *
+ * Return: 0 for success, Negative number for error condition.
+ */
+static long
+uart_compat_ioctl(struct tty_struct *tty, unsigned int cmd, unsigned long arg)
+{
+ return (long)uart_ioctl(tty, cmd, arg);
+};
+
static void uart_set_ldisc(struct tty_struct *tty)
{
struct uart_state *state = tty->driver_data;
@@ -2670,6 +2686,7 @@ static const struct tty_operations uart_ops = {
.chars_in_buffer= uart_chars_in_buffer,
.flush_buffer = uart_flush_buffer,
.ioctl = uart_ioctl,
+ .compat_ioctl = uart_compat_ioctl,
.throttle = uart_throttle,
.unthrottle = uart_unthrottle,
.send_xchar = uart_send_xchar,
--
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