ACPI / osi: Add acpi_osi=!! to allow reverting acpi_osi=!

This patch introduces acpi_osi=!! so that quirks may use it to revert acpi_osi=!. Tested-by: Lukas Wunner <[email protected]> Tested-by: Chen Yu <[email protected]> Signed-off-by: Lv Zheng <[email protected]> Signed-off-by: Rafael J. Wysocki <[email protected]>
josf · May 4, 2016 · a707ede · a707ede
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diff --git a/Documentation/kernel-parameters.txt b/Documentation/kernel-parameters.txt
@@ -312,6 +312,8 @@ bytes respectively. Such letter suffixes can also be entirely omitted.
 			acpi_osi=!*		# remove all strings
 			acpi_osi=!		# disable all built-in OS vendor
 						  strings
+			acpi_osi=!!		# enable all built-in OS vendor
+						  strings
 			acpi_osi=		# disable all strings
 
 			'acpi_osi=!' can be used in combination with single or

diff --git a/drivers/acpi/osl.c b/drivers/acpi/osl.c
@@ -1763,6 +1763,9 @@ void __init acpi_osi_setup(char *str)
 				osi->enable = false;
 			}
 			return;
+		} else if (*str == '!') {
+			osi_config.default_disabling = 0;
+			return;
 		}
 		enable = false;
 	}