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ACPI / bus: Only call dmi_check_system() on X86

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Calling dmi_check_system() early only works on X86. Other
architectures initialize the DMI subsystem later so it's not
ready yet when ACPI itself gets initialized.

In the best case it results in a useless call to a function which
will do nothing. But depending on the dmi implementation, it could
also result in warnings. Best is to not call the function when it
can't work and isn't needed.

Additionally, if anyone ever needs to add non-x86 quirks, it would
surprisingly not work, so document the limitation to avoid confusion.

Signed-off-by: Jean Delvare <jdelvare@suse.de>
Fixes: cce4f632db (ACPI: fix early DSDT dmi check warnings on ia64)
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
This commit is contained in:
Jean Delvare 2018-09-04 14:55:26 +02:00 committed by Rafael J. Wysocki
parent 57361846b5
commit 5d128fbd8b
1 changed files with 7 additions and 6 deletions
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13
drivers/acpi/bus.c
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@ -35,11 +35,11 @@
#include <linux/delay.h>
#ifdef CONFIG_X86
#include <asm/mpspec.h>
#include <linux/dmi.h>
#endif
#include <linux/acpi_iort.h>
#include <linux/pci.h>
#include <acpi/apei.h>
#include <linux/dmi.h>
#include <linux/suspend.h>
#include "internal.h"
@ -82,10 +82,6 @@ static const struct dmi_system_id dsdt_dmi_table[] __initconst = {
},
{}
};
#else
static const struct dmi_system_id dsdt_dmi_table[] __initconst = {
{}
};
#endif
/* --------------------------------------------------------------------------
@ -1033,11 +1029,16 @@ void __init acpi_early_init(void)
acpi_permanent_mmap = true;
#ifdef CONFIG_X86
/*
* If the machine falls into the DMI check table,
* DSDT will be copied to memory
* DSDT will be copied to memory.
* Note that calling dmi_check_system() here on other architectures
* would not be OK because only x86 initializes dmi early enough.
* Thankfully only x86 systems need such quirks for now.
*/
dmi_check_system(dsdt_dmi_table);
#endif
status = acpi_reallocate_root_table();
if (ACPI_FAILURE(status)) {