2022-06-30 20:08:22

by Dmitry Osipenko

Subject: [PATCH v7 1/2] drm/shmem-helper: Add missing vunmap on error

The vmapping of dma-buf may succeed, but DRM SHMEM rejects the IOMEM
mapping, and thus, drm_gem_shmem_vmap_locked() should unvmap the IOMEM
before erroring out.

Cc: [email protected]
Fixes: 49a3f51dfeee ("drm/gem: Use struct dma_buf_map in GEM vmap ops and convert GEM backends")
Signed-off-by: Dmitry Osipenko <[email protected]>
---
drivers/gpu/drm/drm_gem_shmem_helper.c | 1 +
1 file changed, 1 insertion(+)

diff --git a/drivers/gpu/drm/drm_gem_shmem_helper.c b/drivers/gpu/drm/drm_gem_shmem_helper.c
index 8ad0e02991ca..904fc893c905 100644
--- a/drivers/gpu/drm/drm_gem_shmem_helper.c
+++ b/drivers/gpu/drm/drm_gem_shmem_helper.c
@@ -302,6 +302,7 @@ static int drm_gem_shmem_vmap_locked(struct drm_gem_shmem_object *shmem,
ret = dma_buf_vmap(obj->import_attach->dmabuf, map);
if (!ret) {
if (WARN_ON(map->is_iomem)) {
+ dma_buf_vunmap(obj->import_attach->dmabuf, map);
ret = -EIO;
goto err_put_pages;
}
--
2.36.1

2022-08-09 17:03:13

by Daniel Vetter

Subject: Re: [PATCH v7 1/2] drm/shmem-helper: Add missing vunmap on error

On Thu, Jun 30, 2022 at 11:00:57PM +0300, Dmitry Osipenko wrote:
> The vmapping of dma-buf may succeed, but DRM SHMEM rejects the IOMEM
> mapping, and thus, drm_gem_shmem_vmap_locked() should unvmap the IOMEM
> before erroring out.
>
> Cc: [email protected]
> Fixes: 49a3f51dfeee ("drm/gem: Use struct dma_buf_map in GEM vmap ops and convert GEM backends")
> Signed-off-by: Dmitry Osipenko <[email protected]>

Pushed to drm-misc-next-fixes, thanks for your patch.
-Daniel

> ---
> drivers/gpu/drm/drm_gem_shmem_helper.c | 1 +
> 1 file changed, 1 insertion(+)
>
> diff --git a/drivers/gpu/drm/drm_gem_shmem_helper.c b/drivers/gpu/drm/drm_gem_shmem_helper.c
> index 8ad0e02991ca..904fc893c905 100644
> --- a/drivers/gpu/drm/drm_gem_shmem_helper.c
> +++ b/drivers/gpu/drm/drm_gem_shmem_helper.c
> @@ -302,6 +302,7 @@ static int drm_gem_shmem_vmap_locked(struct drm_gem_shmem_object *shmem,
> ret = dma_buf_vmap(obj->import_attach->dmabuf, map);
> if (!ret) {
> if (WARN_ON(map->is_iomem)) {
> + dma_buf_vunmap(obj->import_attach->dmabuf, map);
> ret = -EIO;
> goto err_put_pages;
> }
> --
> 2.36.1
>

--
Daniel Vetter
Software Engineer, Intel Corporation
http://blog.ffwll.ch