[PATCH] ACPI: Add "acpi_no_initrd_override" kernel parameter

[Len Brown <lenb@kernel.org>]

From: Éric Piel <Eric.Piel@tremplin-utc.net>

The acpi_no_initrd_override parameter permits to disable the load of an ACPI
table from the initramfs.

Signed-off-by: Eric Piel <eric.piel@tremplin-utc.net>
Signed-off-by: Len Brown <len.brown@intel.com>
---
 Documentation/kernel-parameters.txt |    3 +++
 drivers/acpi/osl.c                  |   14 +++++++++++++-
 2 files changed, 16 insertions(+), 1 deletions(-)

diff --git a/Documentation/kernel-parameters.txt b/Documentation/kernel-parameters.txt
index 8fd5aa4..ef2316a 100644
--- a/Documentation/kernel-parameters.txt
+++ b/Documentation/kernel-parameters.txt
@@ -175,6 +175,9 @@ and is between 256 and 4096 characters. It is defined in the file
 
 	acpi_no_auto_ssdt	[HW,ACPI] Disable automatic loading of SSDT
 
+	acpi_no_initrd_override	[KNL,ACPI]
+			Disable loading custom ACPI tables from the initramfs
+
 	acpi_os_name=	[HW,ACPI] Tell ACPI BIOS the name of the OS
 			Format: To spoof as Windows 98: ="Microsoft Windows"
 
diff --git a/drivers/acpi/osl.c b/drivers/acpi/osl.c
index bbd8360..40adf0d 100644
--- a/drivers/acpi/osl.c
+++ b/drivers/acpi/osl.c
@@ -77,6 +77,10 @@ static struct workqueue_struct *kacpi_notify_wq;
 #define	OSI_STRING_LENGTH_MAX 64	/* arbitrary */
 static char osi_additional_string[OSI_STRING_LENGTH_MAX];
 
+#ifdef CONFIG_ACPI_CUSTOM_DSDT_INITRD
+static int acpi_no_initrd_override;
+#endif
+
 /*
  * "Ode to _OSI(Linux)"
  *
@@ -386,7 +390,8 @@ acpi_os_table_override(struct acpi_table_header * existing_table,
 		*new_table = (struct acpi_table_header *)AmlCode;
 #endif
 #ifdef CONFIG_ACPI_CUSTOM_DSDT_INITRD
-	if (strncmp(existing_table->signature, "DSDT", 4) == 0) {
+	if ((strncmp(existing_table->signature, "DSDT", 4) == 0) &&
+	    !acpi_no_initrd_override) {
 		struct acpi_table_header *initrd_table = acpi_find_dsdt_initrd();
 		if (initrd_table)
 			*new_table = initrd_table;
@@ -402,6 +407,13 @@ acpi_os_table_override(struct acpi_table_header * existing_table,
 	return AE_OK;
 }
 
+int __init acpi_no_initrd_override_setup(char *s)
+{
+	acpi_no_initrd_override = 1;
+	return 1;
+}
+__setup("acpi_no_initrd_override", acpi_no_initrd_override_setup);
+
 static irqreturn_t acpi_irq(int irq, void *dev_id)
 {
 	return (*acpi_irq_handler) (acpi_irq_context) ? IRQ_HANDLED : IRQ_NONE;
-- 
1.5.4.23.gef5b9

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