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authorRafael J. Wysocki <rafael.j.wysocki@intel.com>2015-06-10 02:33:36 +0300
committerRafael J. Wysocki <rafael.j.wysocki@intel.com>2015-06-11 00:51:27 +0300
commitb064a8fa77dfead647564c46ac8fc5b13bd1ab73 (patch)
tree1785d715d4bb3671c44fa2c01341a89059286e94 /include/linux/acpi.h
parentd4a4f75cd8f29cd9464a5a32e9224a91571d6649 (diff)
downloadlinux-b064a8fa77dfead647564c46ac8fc5b13bd1ab73.tar.xz
ACPI / init: Switch over platform to the ACPI mode later
Commit 73f7d1ca3263 "ACPI / init: Run acpi_early_init() before timekeeping_init()" moved the ACPI subsystem initialization, including the ACPI mode enabling, to an earlier point in the initialization sequence, to allow the timekeeping subsystem use ACPI early. Unfortunately, that resulted in boot regressions on some systems and the early ACPI initialization was moved toward its original position in the kernel initialization code by commit c4e1acbb35e4 "ACPI / init: Invoke early ACPI initialization later". However, that turns out to be insufficient, as boot is still broken on the Tyan S8812 mainboard. To fix that issue, split the ACPI early initialization code into two pieces so the majority of it still located in acpi_early_init() and the part switching over the platform into the ACPI mode goes into a new function, acpi_subsystem_init(), executed at the original early ACPI initialization spot. That fixes the Tyan S8812 boot problem, but still allows ACPI tables to be loaded earlier which is useful to the EFI code in efi_enter_virtual_mode(). Link: https://bugzilla.kernel.org/show_bug.cgi?id=97141 Fixes: 73f7d1ca3263 "ACPI / init: Run acpi_early_init() before timekeeping_init()" Reported-and-tested-by: Marius Tolzmann <tolzmann@molgen.mpg.de> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com> Acked-by: Toshi Kani <toshi.kani@hp.com> Reviewed-by: Hanjun Guo <hanjun.guo@linaro.org> Reviewed-by: Lee, Chun-Yi <jlee@suse.com>
Diffstat (limited to 'include/linux/acpi.h')
-rw-r--r--include/linux/acpi.h2
1 files changed, 2 insertions, 0 deletions
diff --git a/include/linux/acpi.h b/include/linux/acpi.h
index e4da5e35e29c..4550be3bb63b 100644
--- a/include/linux/acpi.h
+++ b/include/linux/acpi.h
@@ -440,6 +440,7 @@ extern acpi_status acpi_pci_osc_control_set(acpi_handle handle,
#define ACPI_OST_SC_INSERT_NOT_SUPPORTED 0x82
extern void acpi_early_init(void);
+extern void acpi_subsystem_init(void);
extern int acpi_nvs_register(__u64 start, __u64 size);
@@ -494,6 +495,7 @@ static inline const char *acpi_dev_name(struct acpi_device *adev)
}
static inline void acpi_early_init(void) { }
+static inline void acpi_subsystem_init(void) { }
static inline int early_acpi_boot_init(void)
{