From: Janne Grunau <j@jannau.net>
Date: Sat, 23 Nov 2024 21:44:04 +0000 (+0100)
Subject: iommu: apple: Mark device with DM_FLAG_VITAL
X-Git-Url: http://git.dujemihanovic.xyz/img/%7B%7B%20%24image.RelPermalink%20%7D%7D?a=commitdiff_plain;h=544a76bac3393045e86a56cc5dfe2477e437c59b;p=u-boot.git

iommu: apple: Mark device with DM_FLAG_VITAL

Avoids NULL pointer dereferences in apple_dart_unmap when the iommu
device is removed before its user. U-boot's device model does not track
dependencies between devices.
Observed on a M1 Ultra Mac Studio with v2024.10.

Acked-by: Mark Kettenis <kettenis@openbsd.org>
Signed-off-by: Janne Grunau <j@jannau.net>
---

diff --git a/drivers/iommu/apple_dart.c b/drivers/iommu/apple_dart.c
index 3e9e7819e5..bfd4ad2010 100644
--- a/drivers/iommu/apple_dart.c
+++ b/drivers/iommu/apple_dart.c
@@ -322,5 +322,5 @@ U_BOOT_DRIVER(apple_dart) = {
 	.ops = &apple_dart_ops,
 	.probe = apple_dart_probe,
 	.remove = apple_dart_remove,
-	.flags	= DM_FLAG_OS_PREPARE
+	.flags	= DM_FLAG_OS_PREPARE | DM_FLAG_VITAL
 };