ACPI fixes for v4.10-rc6

- Revert a recent change that added an ACPI video blacklist entry
    for HP Pavilion dv6 as it turned to introduce backlight handling
    regressions on some systems (Hans de Goede).
 
  - Fix locking in the ACPICA core to avoid deadlocks related to table
    loading that were exposed by a recent change in that area (Lv Zheng).
 -----BEGIN PGP SIGNATURE-----
 Version: GnuPG v2
 
 iQIcBAABCAAGBQJYiopPAAoJEILEb/54YlRx+dUP/1IfhOGZ5DqxEsMk1ZhGqDGU
 GvLDjQ4bs0YDFfpG6rQfQUGqYOVrdlS4T4GiGUWrdwnYf443YamQt1qdxytEKf82
 UAnaYYGw93jUdCZ9DN96IJgbjhm5U6JDTYkIReAH0M2GKtfUPP0u5EkskaeonjZZ
 JfHluZbSIyUqLTi55r8jdUOUqWqyD8lxJ/m+QJxBH+6qox2m1o+WBk+gw5P8kKkW
 jEAzhDsGRi+PHrGFevTviFwSWnFaUexn4eIqhvCZOKC9r2FW9UoKJAhE4WykdIGe
 Mb6PCwvaWRHpQ82V6ZBB4ONooc6Av0q1QONDMshkEVel5m+r32/iXxUzt7WnACMf
 sKn3QVQjGsdmPJy4Ql60hXdQ9mGoJmIFJUm9mrt3IBMVCFDADYh+uvEsaqfGErhD
 JRO0FeGEtX/rO8zvJYywn8Su3X+wgNjtQadbxyzCHjG3W1qYKgYkZmMWWptMK69Z
 9x+9rwR4ZcvdN1ZZ1BuLlxeWhpjX5lN+BkGY3H8Um8fC6N1MdOQo7ykskglNB/BC
 PQaAl7tAYnmqfOlMpaxZPBfdfgVZceQFUwBOMFk/tylTKswLGP9o0yg1KrksgOYg
 VOJW3Zp9J2Ens7uqNiCwwIbreZwoD+WSflCd5yUkj/9x/2hAlbCXLcoZi0P6TiUW
 oIPf5F4miJVTav37Pp3Z
 =vPdH
 -----END PGP SIGNATURE-----

Merge tag 'acpi-4.10-rc6' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm

Pull ACPI fixes from Rafael Wysocki:
 "These fix two regressions introduced recently, one by reverting the
  problematic commit and one by fixing up locking in the ACPICA core.

  Specifics:

   - Revert a recent change that added an ACPI video blacklist entry for
     HP Pavilion dv6 as it turned to introduce backlight handling
     regressions on some systems (Hans de Goede).

   - Fix locking in the ACPICA core to avoid deadlocks related to table
     loading that were exposed by a recent change in that area (Lv
     Zheng)"

* tag 'acpi-4.10-rc6' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm:
  Revert "ACPI / video: Add force_native quirk for HP Pavilion dv6"
  ACPICA: Tables: Fix hidden logic related to acpi_tb_install_standard_table()

drivers/acpi/acpica/tbdata.c

@@ -852,23 +852,18 @@ acpi_tb_install_and_load_table(acpi_physical_address address,
 
 	ACPI_FUNCTION_TRACE(tb_install_and_load_table);
 
-	(void)acpi_ut_acquire_mutex(ACPI_MTX_TABLES);
-
 	/* Install the table and load it into the namespace */
 
 	status = acpi_tb_install_standard_table(address, flags, TRUE,
 						override, &i);
 	if (ACPI_FAILURE(status)) {
-		goto unlock_and_exit;
+		goto exit;
 	}
 
-	(void)acpi_ut_release_mutex(ACPI_MTX_TABLES);
 	status = acpi_tb_load_table(i, acpi_gbl_root_node);
-	(void)acpi_ut_acquire_mutex(ACPI_MTX_TABLES);
 
-unlock_and_exit:
+exit:
 	*table_index = i;
-	(void)acpi_ut_release_mutex(ACPI_MTX_TABLES);
 	return_ACPI_STATUS(status);
 }
 

drivers/acpi/acpica/tbinstal.c

@@ -217,6 +217,10 @@ acpi_tb_install_standard_table(acpi_physical_address address,
 		goto release_and_exit;
 	}
 
+	/* Acquire the table lock */
+
+	(void)acpi_ut_acquire_mutex(ACPI_MTX_TABLES);
+
 	if (reload) {
 		/*
 		 * Validate the incoming table signature.
@@ -244,7 +248,7 @@ acpi_tb_install_standard_table(acpi_physical_address address,
 					 new_table_desc.signature.integer));
 
 			status = AE_BAD_SIGNATURE;
-			goto release_and_exit;
+			goto unlock_and_exit;
 		}
 
 		/* Check if table is already registered */
@@ -279,7 +283,7 @@ acpi_tb_install_standard_table(acpi_physical_address address,
 				/* Table is still loaded, this is an error */
 
 				status = AE_ALREADY_EXISTS;
-				goto release_and_exit;
+				goto unlock_and_exit;
 			} else {
 				/*
 				 * Table was unloaded, allow it to be reloaded.
@@ -290,6 +294,7 @@ acpi_tb_install_standard_table(acpi_physical_address address,
 				 * indicate the re-installation.
 				 */
 				acpi_tb_uninstall_table(&new_table_desc);
+				(void)acpi_ut_release_mutex(ACPI_MTX_TABLES);
 				*table_index = i;
 				return_ACPI_STATUS(AE_OK);
 			}
@@ -303,11 +308,19 @@ acpi_tb_install_standard_table(acpi_physical_address address,
 
 	/* Invoke table handler if present */
 
+	(void)acpi_ut_release_mutex(ACPI_MTX_TABLES);
 	if (acpi_gbl_table_handler) {
 		(void)acpi_gbl_table_handler(ACPI_TABLE_EVENT_INSTALL,
 					     new_table_desc.pointer,
 					     acpi_gbl_table_handler_context);
 	}
+	(void)acpi_ut_acquire_mutex(ACPI_MTX_TABLES);
+
+unlock_and_exit:
+
+	/* Release the table lock */
+
+	(void)acpi_ut_release_mutex(ACPI_MTX_TABLES);
 
 release_and_exit:
 

drivers/acpi/video_detect.c

@@ -305,17 +305,6 @@ static const struct dmi_system_id video_detect_dmi_table[] = {
 		DMI_MATCH(DMI_PRODUCT_NAME, "Dell System XPS L702X"),
 		},
 	},
-	{
-	/* https://bugzilla.redhat.com/show_bug.cgi?id=1204476 */
-	/* https://bugs.launchpad.net/ubuntu/+source/linux-lts-trusty/+bug/1416940 */
-	.callback = video_detect_force_native,
-	.ident = "HP Pavilion dv6",
-	.matches = {
-		DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"),
-		DMI_MATCH(DMI_PRODUCT_NAME, "HP Pavilion dv6 Notebook PC"),
-		},
-	},
-
 	{ },
 };