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Subject[PATCH] ACPI: fix acpi_power_off lockdep splat
Date
Implement acpi_os_create_lock() as a C-preprocessor macro to assign
unique lock_class_key to dynamically allocated locks and suppress wrong
lockdep warnings.

This fixes:
https://bugzilla.kernel.org/show_bug.cgi?id=38152

Reported-by: Borislav Petkov <bp@alien8.de>
Signed-off-by: Andrea Righi <andrea@betterlinux.com>
---
drivers/acpi/osl.c | 2 +-
include/acpi/acpiosxf.h | 12 +++++++++++-
2 files changed, 12 insertions(+), 2 deletions(-)
diff --git a/drivers/acpi/osl.c b/drivers/acpi/osl.c
index 52ca964..2a67602 100644
--- a/drivers/acpi/osl.c
+++ b/drivers/acpi/osl.c
@@ -1336,7 +1336,7 @@ EXPORT_SYMBOL(acpi_resources_are_enforced);
* Create and initialize a spinlock.
*/
acpi_status
-acpi_os_create_lock(acpi_spinlock *out_handle)
+__acpi_os_create_lock(acpi_spinlock *out_handle)
{
spinlock_t *lock;

diff --git a/include/acpi/acpiosxf.h b/include/acpi/acpiosxf.h
index a756bc8..4a0385d 100644
--- a/include/acpi/acpiosxf.h
+++ b/include/acpi/acpiosxf.h
@@ -99,7 +99,17 @@ acpi_os_table_override(struct acpi_table_header *existing_table,
* Spinlock primitives
*/
acpi_status
-acpi_os_create_lock(acpi_spinlock *out_handle);
+__acpi_os_create_lock(acpi_spinlock *out_handle);
+
+#define acpi_os_create_lock(__handle) \
+({ \
+ acpi_status ret; \
+ \
+ ret = __acpi_os_create_lock(__handle); \
+ if (ret == AE_OK) \
+ spin_lock_init(*(__handle)); \
+ ret; \
+})

void acpi_os_delete_lock(acpi_spinlock handle);

--
1.7.4.1


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