From: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Date: Mon, 27 Jan 2014 22:08:09 +0000 (+0100)
Subject: ACPI / scan: Clear match_driver flag in acpi_bus_trim()
X-Git-Tag: v3.14-rc1~21^2~1^3
X-Git-Url: https://asedeno.scripts.mit.edu/gitweb/?a=commitdiff_plain;h=a951c773bc39677ef3fa42814be7f5218a3100b2;p=linux.git

ACPI / scan: Clear match_driver flag in acpi_bus_trim()

Drivers should not bind to struct acpi_device objects that
acpi_bus_trim() has been called for, so make that function
clear flags.match_driver for those objects.

If that is not done, an ACPI driver may theoretically try to operate
a device that is not physically present.

Fixes: 202317a573b2 (ACPI / scan: Add acpi_device objects for all device nodes in the namespace)
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Acked-by: Toshi Kani <toshi.kani@hp.com>
---

diff --git a/drivers/acpi/scan.c b/drivers/acpi/scan.c
index c0f57ff15024..089dc403c43b 100644
--- a/drivers/acpi/scan.c
+++ b/drivers/acpi/scan.c
@@ -2044,6 +2044,7 @@ void acpi_bus_trim(struct acpi_device *adev)
 	list_for_each_entry_reverse(child, &adev->children, node)
 		acpi_bus_trim(child);
 
+	adev->flags.match_driver = false;
 	if (handler) {
 		if (handler->detach)
 			handler->detach(adev);