linux-kernel - [PATCH v2 11/11] drm/qxl: add lock asserts to qxl_bo_vmap_locked + qxl_bo_vunmap

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Date:   Wed, 17 Feb 2021 13:32:13 +0100
From:   Gerd Hoffmann <kraxel@...hat.com>
To:     dri-devel@...ts.freedesktop.org
Cc:     Gerd Hoffmann <kraxel@...hat.com>,
        Thomas Zimmermann <tzimmermann@...e.de>,
        Dave Airlie <airlied@...hat.com>,
        David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>,
        virtualization@...ts.linux-foundation.org (open list:DRM DRIVER FOR QXL
        VIRTUAL GPU),
        spice-devel@...ts.freedesktop.org (open list:DRM DRIVER FOR QXL VIRTUAL
        GPU), linux-kernel@...r.kernel.org (open list)
Subject: [PATCH v2 11/11] drm/qxl: add lock asserts to qxl_bo_vmap_locked + qxl_bo_vunmap_locked

Try avoid re-introducing locking bugs.

Signed-off-by: Gerd Hoffmann <kraxel@...hat.com>
Acked-by: Thomas Zimmermann <tzimmermann@...e.de>
---
 drivers/gpu/drm/qxl/qxl_object.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/drivers/gpu/drm/qxl/qxl_object.c b/drivers/gpu/drm/qxl/qxl_object.c
index 82c3bf195ad6..6e26d70f2f07 100644
--- a/drivers/gpu/drm/qxl/qxl_object.c
+++ b/drivers/gpu/drm/qxl/qxl_object.c
@@ -162,6 +162,8 @@ int qxl_bo_vmap_locked(struct qxl_bo *bo, struct dma_buf_map *map)
 {
 	int r;
 
+	dma_resv_assert_held(bo->tbo.base.resv);
+
 	if (bo->kptr) {
 		bo->map_count++;
 		goto out;
@@ -236,6 +238,8 @@ void *qxl_bo_kmap_atomic_page(struct qxl_device *qdev,
 
 void qxl_bo_vunmap_locked(struct qxl_bo *bo)
 {
+	dma_resv_assert_held(bo->tbo.base.resv);
+
 	if (bo->kptr == NULL)
 		return;
 	bo->map_count--;
-- 
2.29.2