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ARM: OMAP2+: omap_device: use late_initcall_sync

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If DEBUG_LL and earlyprintk are enabled, and omap-serial.c is compiled
as a module, the kernel boot hangs early as the clocks for serial port
are cut while earlyprintk still uses the port.

The problem is a race between the late_initcall for omap_device (which
idles devices that have no drivers) and the late_initcall in
kernel/printk.c which turns off the earlyconsole.   Any printks
that happen between this omap_device late initcall and the earlyconsole
late initcall will crash when accessing the UART.

The fix is to ensure the omap_device initcall happens after the
earlyconsole initcall.

Reported-by: Tony Lindgren <tony@atomide.com>
Signed-off-by: Kevin Hilman <khilman@linaro.org>
Signed-off-by: Tony Lindgren <tony@atomide.com>
This commit is contained in:
Kevin Hilman
2013-05-08 16:48:01 -07:00
committed by Tony Lindgren
parent e65f131a14
commit e7e17c5386
2 changed files with 2 additions and 1 deletions
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2
arch/arm/mach-omap2/omap_device.c
View File

@@ -876,4 +876,4 @@ static int __init omap_device_late_init(void)
bus_for_each_dev(&platform_bus_type, NULL, NULL, omap_device_late_idle);
return 0;
}
omap_late_initcall(omap_device_late_init);
omap_late_initcall_sync(omap_device_late_init);

1
arch/arm/mach-omap2/soc.h
View File

@@ -496,6 +496,7 @@ level(__##fn);
#define omap_subsys_initcall(fn) omap_initcall(subsys_initcall, fn)
#define omap_device_initcall(fn) omap_initcall(device_initcall, fn)
#define omap_late_initcall(fn) omap_initcall(late_initcall, fn)
#define omap_late_initcall_sync(fn) omap_initcall(late_initcall_sync, fn)
#endif /* __ASSEMBLY__ */