[PATCH v2] drm/virtio: Fix NULL vs IS_ERR checking in virtio_gpu_object_shmem_init

[Miaoqian Lin]

Since drm_prime_pages_to_sg() function return error pointers.
The drm_gem_shmem_get_sg_table() function returns error pointers too.
Using IS_ERR() to check the return value to fix this.

Fixes: 2f2aa13724d5 ("drm/virtio: move virtio_gpu_mem_entry initialization to 
new function")
Signed-off-by: Miaoqian Lin <linmq...@gmail.com>
---
changes in v2:
- Update Fixes tag.
- rebase the working tree.
v1 Link: https://lore.kernel.org/all/20211222072649.18169-1-linmq...@gmail.com/
---
 drivers/gpu/drm/virtio/virtgpu_object.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/virtio/virtgpu_object.c 
b/drivers/gpu/drm/virtio/virtgpu_object.c
index f293e6ad52da..1cc8f3fc8e4b 100644
--- a/drivers/gpu/drm/virtio/virtgpu_object.c
+++ b/drivers/gpu/drm/virtio/virtgpu_object.c
@@ -168,9 +168,9 @@ static int virtio_gpu_object_shmem_init(struct 
virtio_gpu_device *vgdev,
         * since virtio_gpu doesn't support dma-buf import from other devices.
         */
        shmem->pages = drm_gem_shmem_get_sg_table(&bo->base);
-       if (!shmem->pages) {
+       if (IS_ERR(shmem->pages)) {
                drm_gem_shmem_unpin(&bo->base);
-               return -EINVAL;
+               return PTR_ERR(shmem->pages);
        }
 
        if (use_dma_api) {
-- 
2.25.1