From mboxrd@z Thu Jan 1 00:00:00 1970 From: khilman@linaro.org (Kevin Hilman) Date: Tue, 7 May 2013 14:39:25 -0700 Subject: [PATCH] ARM: OMAP2+: omap_device: use late_initcall_sync Message-ID: <1367962765-13912-1-git-send-email-khilman@linaro.org> To: linux-arm-kernel@lists.infradead.org List-Id: linux-arm-kernel.lists.infradead.org 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 Signed-off-by: Kevin Hilman --- Based on v3.9-rc8 arch/arm/mach-omap2/omap_device.c | 2 +- arch/arm/mach-omap2/soc.h | 1 + 2 files changed, 2 insertions(+), 1 deletion(-) diff --git a/arch/arm/mach-omap2/omap_device.c b/arch/arm/mach-omap2/omap_device.c index 381be7a..2d20d69 100644 --- a/arch/arm/mach-omap2/omap_device.c +++ b/arch/arm/mach-omap2/omap_device.c @@ -879,4 +879,4 @@ 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); diff --git a/arch/arm/mach-omap2/soc.h b/arch/arm/mach-omap2/soc.h index c62116b..de88611 100644 --- a/arch/arm/mach-omap2/soc.h +++ b/arch/arm/mach-omap2/soc.h @@ -494,6 +494,7 @@ 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__ */ -- 1.8.2