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commit 64b3db22c04586997ab4be46dd5a5b99f8a2d390 (2.6.39),
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"Remove use of unreliable FADT revision field" causes regression
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for old P4 systems because now cst_control and other fields are
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not reset to 0.
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The effect is that acpi_processor_power_init will notice
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cst_control != 0 and a write to CST_CNT register is performed
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that should not happen. As result, the system oopses after the
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"No _CST, giving up" message, sometimes in acpi_ns_internalize_name,
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sometimes in acpi_ns_get_type, usually at random places. May be
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during migration to CPU 1 in acpi_processor_get_throttling.
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Every one of these settings help to avoid this problem:
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- acpi=off
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- processor.nocst=1
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- maxcpus=1
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The fix is to update acpi_gbl_FADT.header.length after
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the original value is used to check for old revisions.
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Signed-off-by: Julian Anastasov <ja@ssi.bg>
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---
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drivers/acpi/acpica/tbfadt.c | 8 ++++----
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1 files changed, 4 insertions(+), 4 deletions(-)
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diff --git a/drivers/acpi/acpica/tbfadt.c b/drivers/acpi/acpica/tbfadt.c
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index c5d8704..4c9c760 100644
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--- a/drivers/acpi/acpica/tbfadt.c
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+++ b/drivers/acpi/acpica/tbfadt.c
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@@ -363,10 +363,6 @@ static void acpi_tb_convert_fadt(void)
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u32 address32;
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u32 i;
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- /* Update the local FADT table header length */
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-
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- acpi_gbl_FADT.header.length = sizeof(struct acpi_table_fadt);
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-
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/*
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* Expand the 32-bit FACS and DSDT addresses to 64-bit as necessary.
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* Later code will always use the X 64-bit field. Also, check for an
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@@ -408,6 +404,10 @@ static void acpi_tb_convert_fadt(void)
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acpi_gbl_FADT.boot_flags = 0;
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}
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+ /* Update the local FADT table header length */
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+
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+ acpi_gbl_FADT.header.length = sizeof(struct acpi_table_fadt);
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+
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/*
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* Expand the ACPI 1.0 32-bit addresses to the ACPI 2.0 64-bit "X"
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* generic address structures as necessary. Later code will always use
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--
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1.7.3.4
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--
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