linux-kernel - [PATCH v3 2/2] drm/gem-shmem: Add import attachment warning to locked pin function

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Date: Wed,  1 May 2024 07:56:00 +0100
From: Adrián Larumbe <adrian.larumbe@...labora.com>
To: Qiang Yu <yuq825@...il.com>,
	Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
	Maxime Ripard <mripard@...nel.org>,
	Thomas Zimmermann <tzimmermann@...e.de>,
	David Airlie <airlied@...il.com>,
	Daniel Vetter <daniel@...ll.ch>,
	Boris Brezillon <boris.brezillon@...labora.com>,
	Rob Herring <robh@...nel.org>,
	Steven Price <steven.price@....com>,
	Sumit Semwal <sumit.semwal@...aro.org>,
	Christian Koenig= <christian.koenig@....com>,
	Dmitry Osipenko <dmitry.osipenko@...labora.com>,
	Zack Rusin <zack.rusin@...adcom.com>
Cc: kernel@...labora.com,
	Adrian Larumbe <adrian.larumbe@...labora.com>,
	dri-devel@...ts.freedesktop.org,
	lima@...ts.freedesktop.org,
	linux-kernel@...r.kernel.org,
	linux-media@...r.kernel.org,
	linaro-mm-sig@...ts.linaro.org
Subject: [PATCH v3 2/2] drm/gem-shmem: Add import attachment warning to locked pin function

Commit ec144244a43f ("drm/gem-shmem: Acquire reservation lock in GEM
pin/unpin callbacks") moved locking DRM object's dma reservation to
drm_gem_shmem_object_pin, and made drm_gem_shmem_pin_locked public, so we
need to make sure the non-NULL check warning is also added to the latter.

Signed-off-by: Adrián Larumbe <adrian.larumbe@...labora.com>
---
 drivers/gpu/drm/drm_gem_shmem_helper.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/gpu/drm/drm_gem_shmem_helper.c b/drivers/gpu/drm/drm_gem_shmem_helper.c
index 177773bcdbfd..ad5d9f704e15 100644
--- a/drivers/gpu/drm/drm_gem_shmem_helper.c
+++ b/drivers/gpu/drm/drm_gem_shmem_helper.c
@@ -233,6 +233,8 @@ int drm_gem_shmem_pin_locked(struct drm_gem_shmem_object *shmem)
 
 	dma_resv_assert_held(shmem->base.resv);
 
+	drm_WARN_ON(shmem->base.dev, shmem->base.import_attach);
+
 	ret = drm_gem_shmem_get_pages(shmem);
 
 	return ret;
-- 
2.44.0