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

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Message-ID: <YvKNeMJjOjy8B+YH@phenom.ffwll.local>
Date:   Tue, 9 Aug 2022 18:38:16 +0200
From:   Daniel Vetter <daniel@...ll.ch>
To:     Dmitry Osipenko <dmitry.osipenko@...labora.com>
Cc:     David Airlie <airlied@...ux.ie>, Daniel Vetter <daniel@...ll.ch>,
        Maxime Ripard <mripard@...nel.org>,
        Thomas Zimmermann <tzimmermann@...e.de>,
        dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org,
        Dmitry Osipenko <digetx@...il.com>, kernel@...labora.com
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: stable@...r.kernel.org
> Fixes: 49a3f51dfeee ("drm/gem: Use struct dma_buf_map in GEM vmap ops and convert GEM backends")
> Signed-off-by: Dmitry Osipenko <dmitry.osipenko@...labora.com>

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