On Mon, Jan 16, 2006 at 04:27:17PM -0600, Kumar Gala wrote:
> This patch is breaking arch/ppc & arch/powerpc usage of 8250.c. The
> issue appears to be with the order in which platform_driver_register
> () is called vs platform_device_add().
>
> arch/powerpc/kernel/legacy_serial.c registers an 8250 device on the
> platform bus before 8250_init() gets called.
>
> Changing the order of platform_driver_register() vs
> platform_device_add() fixes the issue. I'm still not sure what the
> correct solution to this is. Ideas? comments?
Mea Culpa - should've spotted that - that patch is actually rather
broken. platform_driver_register() can't be moved from where it
initially was.
diff --git a/drivers/serial/8250.c b/drivers/serial/8250.c
--- a/drivers/serial/8250.c
+++ b/drivers/serial/8250.c
@@ -2595,15 +2595,11 @@ static int __init serial8250_init(void)
if (ret)
goto out;
- ret = platform_driver_register(&serial8250_isa_driver);
- if (ret)
- goto unreg_uart_drv;
-
serial8250_isa_devs = platform_device_alloc("serial8250",
PLAT8250_DEV_LEGACY);
if (!serial8250_isa_devs) {
ret = -ENOMEM;
- goto unreg_plat_drv;
+ goto unreg_uart_drv;
}
ret = platform_device_add(serial8250_isa_devs);
@@ -2612,12 +2608,13 @@ static int __init serial8250_init(void)
serial8250_register_ports(&serial8250_reg, &serial8250_isa_devs->dev);
- goto out;
+ ret = platform_driver_register(&serial8250_isa_driver);
+ if (ret == 0)
+ goto out;
+ platform_device_del(serial8250_isa_devs);
put_dev:
platform_device_put(serial8250_isa_devs);
- unreg_plat_drv:
- platform_driver_unregister(&serial8250_isa_driver);
unreg_uart_drv:
uart_unregister_driver(&serial8250_reg);
out:
--
Russell King
Linux kernel 2.6 ARM Linux - http://www.arm.linux.org.uk/
maintainer of: 2.6 Serial core
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