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authorRandy Wright <rwright@hp.com>2014-06-04 08:55:59 -0700
committerRafael J. Wysocki <rafael.j.wysocki@intel.com>2014-06-05 14:36:40 +0200
commita4714a898e85205e1118ec923cde43d88eb105f6 (patch)
tree17f3011a638e8c17f6df28d608dc6cf0647128f7 /drivers/acpi
parent72013795a73f8536d3346fa90379c987bcad0cc8 (diff)
ACPI: Fix bug when ACPI reset register is implemented in system memory
Use acpi_os_map_generic_address to pre-map the reset register if it is memory mapped, thereby preventing the BUG_ON() in line 1319 of mm/vmalloc.c from triggering during panic-triggered reboots. Link: https://bugzilla.kernel.org/show_bug.cgi?id=77131 Signed-off-by: Randy Wright <rwright@hp.com> Signed-off-by: David E. Box <david.e.box@linux.intel.com> [rjw: Changelog, simplified code] Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Diffstat (limited to 'drivers/acpi')
-rw-r--r--drivers/acpi/osl.c12
1 files changed, 12 insertions, 0 deletions
diff --git a/drivers/acpi/osl.c b/drivers/acpi/osl.c
index 6776c599816f..88cddf84d245 100644
--- a/drivers/acpi/osl.c
+++ b/drivers/acpi/osl.c
@@ -1798,6 +1798,16 @@ acpi_status __init acpi_os_initialize(void)
acpi_os_map_generic_address(&acpi_gbl_FADT.xpm1b_event_block);
acpi_os_map_generic_address(&acpi_gbl_FADT.xgpe0_block);
acpi_os_map_generic_address(&acpi_gbl_FADT.xgpe1_block);
+ if (acpi_gbl_FADT.flags & ACPI_FADT_RESET_REGISTER) {
+ /*
+ * Use acpi_os_map_generic_address to pre-map the reset
+ * register if it's in system memory.
+ */
+ int rv;
+
+ rv = acpi_os_map_generic_address(&acpi_gbl_FADT.reset_register);
+ pr_debug(PREFIX "%s: map reset_reg status %d\n", __func__, rv);
+ }
return AE_OK;
}
@@ -1826,6 +1836,8 @@ acpi_status acpi_os_terminate(void)
acpi_os_unmap_generic_address(&acpi_gbl_FADT.xgpe0_block);
acpi_os_unmap_generic_address(&acpi_gbl_FADT.xpm1b_event_block);
acpi_os_unmap_generic_address(&acpi_gbl_FADT.xpm1a_event_block);
+ if (acpi_gbl_FADT.flags & ACPI_FADT_RESET_REGISTER)
+ acpi_os_unmap_generic_address(&acpi_gbl_FADT.reset_register);
destroy_workqueue(kacpid_wq);
destroy_workqueue(kacpi_notify_wq);