From 9768a37cec37b03f745ce90f8c3d378e0aa223ae Mon Sep 17 00:00:00 2001 From: Francesco Dolcini Date: Wed, 20 Oct 2021 21:26:43 +0200 Subject: [PATCH] serial: imx: disable console clocks on unregister During console setup imx_uart_console_setup() enables clocks, but they are never disabled when the console is unregistered, this leads to clk_prepare_enable() being called multiple times without a matching clk_disable_unprepare() in case of console unregister. Ensure that clock enable/disable are balanced adding clk_disable_unprepare() in the console exit callback. Signed-off-by: Francesco Dolcini Link: https://lore.kernel.org/r/20211020192643.476895-3-francesco.dolcini@toradex.com Signed-off-by: Greg Kroah-Hartman --- drivers/tty/serial/imx.c | 12 ++++++++++++ 1 file changed, 12 insertions(+) diff --git a/drivers/tty/serial/imx.c b/drivers/tty/serial/imx.c index 51a9f9423b1a..90f82e6c54e4 100644 --- a/drivers/tty/serial/imx.c +++ b/drivers/tty/serial/imx.c @@ -2124,12 +2124,24 @@ error_console: return retval; } +static int +imx_uart_console_exit(struct console *co) +{ + struct imx_port *sport = imx_uart_ports[co->index]; + + clk_disable_unprepare(sport->clk_per); + clk_disable_unprepare(sport->clk_ipg); + + return 0; +} + static struct uart_driver imx_uart_uart_driver; static struct console imx_uart_console = { .name = DEV_NAME, .write = imx_uart_console_write, .device = uart_console_device, .setup = imx_uart_console_setup, + .exit = imx_uart_console_exit, .flags = CON_PRINTBUFFER, .index = -1, .data = &imx_uart_uart_driver,