From cd8e2b48daee891011a4f21e2c62b210d24dcc9e Mon Sep 17 00:00:00 2001 From: Venkatesh Pallipadi Date: Fri, 21 Oct 2005 19:22:00 -0400 Subject: [PATCH] [ACPI] fix 2.6.13 boot hang regression on HT box w/ broken BIOS http://bugzilla.kernel.org/show_bug.cgi?id=5452 Signed-off-by: Venkatesh Pallipadi Signed-off-by: Len Brown --- drivers/acpi/processor_core.c | 15 +++++++++++++++ 1 file changed, 15 insertions(+) diff --git a/drivers/acpi/processor_core.c b/drivers/acpi/processor_core.c index 421792562642..0c561c571f29 100644 --- a/drivers/acpi/processor_core.c +++ b/drivers/acpi/processor_core.c @@ -543,6 +543,8 @@ static int acpi_processor_get_info(struct acpi_processor *pr) return_VALUE(0); } +static void *processor_device_array[NR_CPUS]; + static int acpi_processor_start(struct acpi_device *device) { int result = 0; @@ -561,6 +563,19 @@ static int acpi_processor_start(struct acpi_device *device) BUG_ON((pr->id >= NR_CPUS) || (pr->id < 0)); + /* + * Buggy BIOS check + * ACPI id of processors can be reported wrongly by the BIOS. + * Don't trust it blindly + */ + if (processor_device_array[pr->id] != NULL && + processor_device_array[pr->id] != (void *)device) { + ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "BIOS reporting wrong ACPI id" + "for the processor\n")); + return_VALUE(-ENODEV); + } + processor_device_array[pr->id] = (void *)device; + processors[pr->id] = pr; result = acpi_processor_add_fs(device);