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mxser: rework and simplify mxser_open 

In mxser_open, tty->port is already set thanks to
tty_port_register_device in ->probe. So we can simply use container_of
to deduce the struct mxser_port's pointer. Thus avoiding divisions and
complex computations.

Signed-off-by: Jiri Slaby <jslaby@suse.cz>
Link: https://lore.kernel.org/r/20210618061516.662-51-jslaby@suse.cz
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Jiri Slaby 2021-06-18 08:14:56 +02:00 committed by Greg Kroah-Hartman
parent c3db20c3b7
commit 42ad25fc46
1 changed files with 4 additions and 7 deletions
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11
drivers/tty/mxser.c
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@ -856,15 +856,12 @@ static void mxser_shutdown_port(struct tty_port *port)
*/
static int mxser_open(struct tty_struct *tty, struct file *filp)
{
struct mxser_port *info;
int line = tty->index;
struct tty_port *tport = tty->port;
struct mxser_port *port = container_of(tport, struct mxser_port, port);
info = &mxser_boards[line / MXSER_PORTS_PER_BOARD].ports[line % MXSER_PORTS_PER_BOARD];
if (!info->ioaddr)
return -ENODEV;
tty->driver_data = port;
tty->driver_data = info;
return tty_port_open(&info->port, tty, filp);
return tty_port_open(tport, tty, filp);
}
static void mxser_flush_buffer(struct tty_struct *tty)