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authorLen Brown <len.brown@intel.com>2008-11-06 20:51:59 -0500
committerLen Brown <len.brown@intel.com>2008-11-06 20:51:59 -0500
commitd17cb18a07c587b8f9ff174a1bf6d03413eabe64 (patch)
tree8ee13e9c4fa88208e3f09cc1137653c14802137a /drivers
parentf4a9bc4c7de4cef83e86a7052eb2e88b193668e4 (diff)
Revert "ACPI: Ingore the RESET_REG_SUP bit when using ACPI reset mechanism"
This reverts commit 8fd145917fb62368a9b80db59562c20576238f5a. http://bugzilla.kernel.org/show_bug.cgi?id=11942 Signed-off-by: Len Brown <len.brown@intel.com>
Diffstat (limited to 'drivers')
-rw-r--r--drivers/acpi/reboot.c25
1 files changed, 3 insertions, 22 deletions
diff --git a/drivers/acpi/reboot.c b/drivers/acpi/reboot.c
index 755baf2ca70..a6b662c00b6 100644
--- a/drivers/acpi/reboot.c
+++ b/drivers/acpi/reboot.c
@@ -15,28 +15,9 @@ void acpi_reboot(void)
rr = &acpi_gbl_FADT.reset_register;
- /*
- * Is the ACPI reset register supported?
- *
- * According to ACPI 3.0, FADT.flags.RESET_REG_SUP indicates
- * whether the ACPI reset mechanism is supported.
- *
- * However, some boxes have this bit clear, yet a valid
- * ACPI_RESET_REG & RESET_VALUE, and ACPI reboot is the only
- * mechanism that works for them after S3.
- *
- * This suggests that other operating systems may not be checking
- * the RESET_REG_SUP bit, and are using other means to decide
- * whether to use the ACPI reboot mechanism or not.
- *
- * So when acpi reboot is requested,
- * only the reset_register is checked. If the following
- * conditions are met, it indicates that the reset register is supported.
- * a. reset_register is not zero
- * b. the access width is eight
- * c. the bit_offset is zero
- */
- if (!(rr->address) || rr->bit_width != 8 || rr->bit_offset != 0)
+ /* Is the reset register supported? */
+ if (!(acpi_gbl_FADT.flags & ACPI_FADT_RESET_REGISTER) ||
+ rr->bit_width != 8 || rr->bit_offset != 0)
return;
reset_value = acpi_gbl_FADT.reset_value;