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Code Issues Releases Wiki Activity

serial: core: Fix probing serial_base_bus devices 

If a physical serial port device driver uses arch_initcall() we fail to
probe the serial_base_bus devices and the serial port tx fails. This is
because as serial_base_bus uses module_initcall().

Let's fix the issue by changing serial_base_bus to use arch_initcall().

Let's also return an error if a driver attempts to call uart_add_one_port()
too early.

Reported-by: Marek Szyprowski <m.szyprowski@samsung.com>
Tested-by: Marek Szyprowski <m.szyprowski@samsung.com>
Closes: https://lore.kernel.org/linux-serial/20230601132012.GB14287@atomide.com/T/#m6a40440fc04d551d27b147da8602e065c982a115
Fixes: 84a9582fd2 ("serial: core: Start managing serial controllers to enable runtime PM")
Signed-off-by: Tony Lindgren <tony@atomide.com>
Link: https://lore.kernel.org/r/20230601141445.11321-1-tony@atomide.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Tony Lindgren 2023-06-01 17:14:44 +03:00 committed by Greg Kroah-Hartman
parent d0a396083e
commit 539914240a
1 changed files with 10 additions and 1 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

11
drivers/tty/serial/serial_base_bus.c
View File

@ -17,6 +17,8 @@
#include "serial_base.h"
static bool serial_base_initialized;
static int serial_base_match(struct device *dev, struct device_driver *drv)
{
int len = strlen(drv->name);
@ -48,6 +50,11 @@ static int serial_base_device_init(struct uart_port *port,
void (*release)(struct device *dev),
int id)
{
if (!serial_base_initialized) {
dev_err(port->dev, "uart_add_one_port() called before arch_initcall()?\n");
return -EPROBE_DEFER;
}
device_initialize(dev);
dev->type = type;
dev->parent = parent_dev;
@ -175,6 +182,8 @@ static int serial_base_init(void)
if (ret)
goto err_ctrl_exit;
serial_base_initialized = true;
return 0;
err_ctrl_exit:
@ -185,7 +194,7 @@ err_bus_unregister:
return ret;
}
module_init(serial_base_init);
arch_initcall(serial_base_init);
static void serial_base_exit(void)
{