This is a note to let you know that I've just added the patch titled
drm/buddy: Fix alloc_range() error handling code
to the 6.7-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
drm-buddy-fix-alloc_range-error-handling-code.patch
and it can be found in the queue-6.7 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 8746c6c9dfa31d269c65dd52ab42fde0720b7d91 Mon Sep 17 00:00:00 2001
From: Arunpravin Paneer Selvam <Arunpravin.PaneerSelvam@xxxxxxx>
Date: Wed, 14 Feb 2024 18:48:52 +0530
Subject: drm/buddy: Fix alloc_range() error handling code
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From: Arunpravin Paneer Selvam <Arunpravin.PaneerSelvam@xxxxxxx>
commit 8746c6c9dfa31d269c65dd52ab42fde0720b7d91 upstream.
Few users have observed display corruption when they boot
the machine to KDE Plasma or playing games. We have root
caused the problem that whenever alloc_range() couldn't
find the required memory blocks the function was returning
SUCCESS in some of the corner cases.
The right approach would be if the total allocated size
is less than the required size, the function should
return -ENOSPC.
Cc: <stable@xxxxxxxxxxxxxxx> # 6.7+
Fixes: 0a1844bf0b53 ("drm/buddy: Improve contiguous memory allocation")
Closes: https://gitlab.freedesktop.org/drm/amd/-/issues/3097
Tested-by: Mario Limonciello <mario.limonciello@xxxxxxx>
Link: https://patchwork.kernel.org/project/dri-devel/patch/20240207174456.341121-1-Arunpravin.PaneerSelvam@xxxxxxx/
Acked-by: Christian König <christian.koenig@xxxxxxx>
Reviewed-by: Matthew Auld <matthew.auld@xxxxxxxxx>
Signed-off-by: Arunpravin Paneer Selvam <Arunpravin.PaneerSelvam@xxxxxxx>
Link: https://patchwork.freedesktop.org/patch/msgid/20240214131853.5934-1-Arunpravin.PaneerSelvam@xxxxxxx
Signed-off-by: Christian König <christian.koenig@xxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/gpu/drm/drm_buddy.c | 6 ++++++
1 file changed, 6 insertions(+)
diff --git a/drivers/gpu/drm/drm_buddy.c b/drivers/gpu/drm/drm_buddy.c
index f57e6d74fb0e..c1a99bf4dffd 100644
--- a/drivers/gpu/drm/drm_buddy.c
+++ b/drivers/gpu/drm/drm_buddy.c
@@ -539,6 +539,12 @@ static int __alloc_range(struct drm_buddy *mm,
} while (1);
list_splice_tail(&allocated, blocks);
+
+ if (total_allocated < size) {
+ err = -ENOSPC;
+ goto err_free;
+ }
+
return 0;
err_undo:
--
2.43.2
Patches currently in stable-queue which might be from Arunpravin.PaneerSelvam@xxxxxxx are
queue-6.7/drm-buddy-fix-alloc_range-error-handling-code.patch
