Commit a4714a89 authored by Randy Wright's avatar Randy Wright Committed by Rafael J. Wysocki

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=77131Signed-off-by: default avatarRandy Wright <rwright@hp.com>
Signed-off-by: default avatarDavid E. Box <david.e.box@linux.intel.com>
[rjw: Changelog, simplified code]
Signed-off-by: default avatarRafael J. Wysocki <rafael.j.wysocki@intel.com>
parent 72013795
...@@ -1798,6 +1798,16 @@ acpi_status __init acpi_os_initialize(void) ...@@ -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.xpm1b_event_block);
acpi_os_map_generic_address(&acpi_gbl_FADT.xgpe0_block); acpi_os_map_generic_address(&acpi_gbl_FADT.xgpe0_block);
acpi_os_map_generic_address(&acpi_gbl_FADT.xgpe1_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; return AE_OK;
} }
...@@ -1826,6 +1836,8 @@ acpi_status acpi_os_terminate(void) ...@@ -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.xgpe0_block);
acpi_os_unmap_generic_address(&acpi_gbl_FADT.xpm1b_event_block); acpi_os_unmap_generic_address(&acpi_gbl_FADT.xpm1b_event_block);
acpi_os_unmap_generic_address(&acpi_gbl_FADT.xpm1a_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(kacpid_wq);
destroy_workqueue(kacpi_notify_wq); destroy_workqueue(kacpi_notify_wq);
......
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