Patch "drm/ttm: Don't leak a resource on eviction error" has been added to the 6.4-stable tree

[gregkh at linuxfoundation.org]

This is a note to let you know that I've just added the patch titled

    drm/ttm: Don't leak a resource on eviction error

to the 6.4-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-ttm-don-t-leak-a-resource-on-eviction-error.patch
and it can be found in the queue-6.4 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable at vger.kernel.org> know about it.


>From e8188c461ee015ba0b9ab2fc82dbd5ebca5a5532 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Thomas=20Hellstr=C3=B6m?= <thomas.hellstrom at linux.intel.com>
Date: Mon, 26 Jun 2023 11:14:49 +0200
Subject: drm/ttm: Don't leak a resource on eviction error
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

From: Thomas Hellström <thomas.hellstrom at linux.intel.com>

commit e8188c461ee015ba0b9ab2fc82dbd5ebca5a5532 upstream.

On eviction errors other than -EMULTIHOP we were leaking a resource.
Fix.

v2:
- Avoid yet another goto (Andi Shyti)

Fixes: 403797925768 ("drm/ttm: Fix multihop assert on eviction.")
Cc: Andrey Grodzovsky <andrey.grodzovsky at amd.com>
Cc: Christian König <christian.koenig at amd.com>
Cc: Christian Koenig <christian.koenig at amd.com>
Cc: Huang Rui <ray.huang at amd.com>
Cc: dri-devel at lists.freedesktop.org
Cc: <stable at vger.kernel.org> # v5.15+
Signed-off-by: Thomas Hellström <thomas.hellstrom at linux.intel.com>
Reviewed-by: Nirmoy Das <nirmoy.das at intel.com> #v1
Reviewed-by: Andi Shyti <andi.shyti at linux.intel.com>
Reviewed-by: Christian König <christian.koenig at amd.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20230626091450.14757-4-thomas.hellstrom@linux.intel.com
Signed-off-by: Greg Kroah-Hartman <gregkh at linuxfoundation.org>
---
 drivers/gpu/drm/ttm/ttm_bo.c |   22 +++++++++++-----------
 1 file changed, 11 insertions(+), 11 deletions(-)

--- a/drivers/gpu/drm/ttm/ttm_bo.c
+++ b/drivers/gpu/drm/ttm/ttm_bo.c
@@ -458,18 +458,18 @@ static int ttm_bo_evict(struct ttm_buffe
 		goto out;
 	}
 
-bounce:
-	ret = ttm_bo_handle_move_mem(bo, evict_mem, true, ctx, &hop);
-	if (ret == -EMULTIHOP) {
+	do {
+		ret = ttm_bo_handle_move_mem(bo, evict_mem, true, ctx, &hop);
+		if (ret != -EMULTIHOP)
+			break;
+
 		ret = ttm_bo_bounce_temp_buffer(bo, &evict_mem, ctx, &hop);
-		if (ret) {
-			if (ret != -ERESTARTSYS && ret != -EINTR)
-				pr_err("Buffer eviction failed\n");
-			ttm_resource_free(bo, &evict_mem);
-			goto out;
-		}
-		/* try and move to final place now. */
-		goto bounce;
+	} while (!ret);
+
+	if (ret) {
+		ttm_resource_free(bo, &evict_mem);
+		if (ret != -ERESTARTSYS && ret != -EINTR)
+			pr_err("Buffer eviction failed\n");
 	}
 out:
 	return ret;


Patches currently in stable-queue which might be from thomas.hellstrom at linux.intel.com are

queue-6.4/drm-ttm-don-t-leak-a-resource-on-swapout-move-error.patch
queue-6.4/drm-ttm-don-t-leak-a-resource-on-eviction-error.patch