From 48a00c0f66b21df1167d7b8cf5a8940c7425c0f9 Mon Sep 17 00:00:00 2001
From: Augustin Cavalier <waddlesplash@gmail.com>
Date: Fri, 13 Sep 2019 22:03:10 -0400
Subject: [PATCH] acpi: Support namespace reads into user addresses.

Fixes #15176.
---
 src/add-ons/kernel/bus_managers/acpi/NamespaceDump.cpp | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/src/add-ons/kernel/bus_managers/acpi/NamespaceDump.cpp b/src/add-ons/kernel/bus_managers/acpi/NamespaceDump.cpp
index 3a0e90126f..3b930b947f 100644
--- a/src/add-ons/kernel/bus_managers/acpi/NamespaceDump.cpp
+++ b/src/add-ons/kernel/bus_managers/acpi/NamespaceDump.cpp
@@ -14,6 +14,7 @@
 
 #include <Drivers.h>
 
+#include <kernel.h>
 #include <util/kernel_cpp.h>
 #include <util/ring_buffer.h>
 
@@ -389,7 +390,10 @@ RingBuffer::~RingBuffer()
 size_t
 RingBuffer::Read(void *buffer, ssize_t size)
 {
-	return ring_buffer_read(fBuffer, (uint8*)buffer, size);
+	if (IS_USER_ADDRESS(buffer))
+		return ring_buffer_user_read(fBuffer, (uint8*)buffer, size);
+	else
+		return ring_buffer_read(fBuffer, (uint8*)buffer, size);
 }