diff mbox series

[5.12,057/173] Revert "ACPI: sleep: Put the FACS table after using it"

Message ID 20210614102700.057572226@linuxfoundation.org
State New
Headers show
Series None | expand

Commit Message

Greg Kroah-Hartman June 14, 2021, 10:26 a.m. UTC 
From: Zhang Rui <rui.zhang@intel.com>

commit f1ffa9d4cccc8fdf6c03fb1b3429154d22037988 upstream.

Commit 95722237cb2a ("ACPI: sleep: Put the FACS table after using it")
puts the FACS table during initialization.

But the hardware signature bits in the FACS table need to be accessed,
after every hibernation, to compare with the original hardware
signature.

So there is no reason to release the FACS table mapping after
initialization.

This reverts commit 95722237cb2ae4f7b73471058cdb19e8f4057c93.

An alternative solution is to use acpi_gbl_FACS variable instead, which
is mapped by the ACPICA core and never released.

Link: https://bugzilla.kernel.org/show_bug.cgi?id=212277
Reported-by: Stephan Hohe <sth.dev@tejp.de>
Signed-off-by: Zhang Rui <rui.zhang@intel.com>
Cc: 5.8+ <stable@vger.kernel.org> # 5.8+
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
 drivers/acpi/sleep.c |    4 +---
 1 file changed, 1 insertion(+), 3 deletions(-)
diff mbox series

Patch

--- a/drivers/acpi/sleep.c
+++ b/drivers/acpi/sleep.c
@@ -1009,10 +1009,8 @@  static void acpi_sleep_hibernate_setup(v
 		return;
 
 	acpi_get_table(ACPI_SIG_FACS, 1, (struct acpi_table_header **)&facs);
-	if (facs) {
+	if (facs)
 		s4_hardware_signature = facs->hardware_signature;
-		acpi_put_table((struct acpi_table_header *)facs);
-	}
 }
 #else /* !CONFIG_HIBERNATION */
 static inline void acpi_sleep_hibernate_setup(void) {}