From: Matwey V. Kornilov Date: Mon, 15 Feb 2016 18:42:12 +0000 (+0300) Subject: tty: serial: 8250: Cleanup p->em485 in serial8250_unregister_port X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=bf2a0be45ffc5ab706f9be71a2cdc3f4600cb444;p=linux-beck.git tty: serial: 8250: Cleanup p->em485 in serial8250_unregister_port Formally, currently there is no memory leak, but if serial8250_ports[line] is reused with other 8250 driver, then em485 will be already activated and it will cause issues. Fixes: e490c9144cfa ("tty: Add software emulated RS485 support for 8250") Signed-off-by: Matwey V. Kornilov Signed-off-by: Greg Kroah-Hartman --- diff --git a/drivers/tty/serial/8250/8250_core.c b/drivers/tty/serial/8250/8250_core.c index 77752216de0e..2f4f5ee651db 100644 --- a/drivers/tty/serial/8250/8250_core.c +++ b/drivers/tty/serial/8250/8250_core.c @@ -1074,6 +1074,15 @@ void serial8250_unregister_port(int line) struct uart_8250_port *uart = &serial8250_ports[line]; mutex_lock(&serial_mutex); + + if (uart->em485) { + unsigned long flags; + + spin_lock_irqsave(&uart->port.lock, flags); + serial8250_em485_destroy(uart); + spin_unlock_irqrestore(&uart->port.lock, flags); + } + uart_remove_one_port(&serial8250_reg, &uart->port); if (serial8250_isa_devs) { uart->port.flags &= ~UPF_BOOT_AUTOCONF;