From: Greg Kroah-Hartman gregkh@linuxfoundation.org
From: Noralf Trønnes noralf@tronnes.org
commit 64e194e278673bceb68fb2dde7dbc3d812bfceb3 upstream.
dma-buf importing was reworked in commit 7d2cd72a9aa3 ("drm/shmem-helpers: Simplify dma-buf importing"). Before that commit drm_gem_shmem_prime_import_sg_table() did set ->pages_use_count=1 and drm_gem_shmem_vunmap_locked() could call drm_gem_shmem_put_pages() unconditionally. Now without the use count set, put pages is called also on dma-bufs. Fix this by only putting pages if it's not imported.
Signed-off-by: Noralf Trønnes noralf@tronnes.org Fixes: 7d2cd72a9aa3 ("drm/shmem-helpers: Simplify dma-buf importing") Cc: Daniel Vetter daniel.vetter@ffwll.ch Cc: Thomas Zimmermann tzimmermann@suse.de Acked-by: Thomas Zimmermann tzimmermann@suse.de Tested-by: Thomas Zimmermann tzimmermann@suse.de Link: https://patchwork.freedesktop.org/patch/msgid/20210219122203.51130-1-noralf@... (cherry picked from commit cdea72518a2b38207146e92e1c9e2fac15975679) Signed-off-by: Thomas Zimmermann tzimmermann@suse.de Signed-off-by: Maarten Lankhorst maarten.lankhorst@linux.intel.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- drivers/gpu/drm/drm_gem_shmem_helper.c | 7 ++++--- 1 file changed, 4 insertions(+), 3 deletions(-)
--- a/drivers/gpu/drm/drm_gem_shmem_helper.c +++ b/drivers/gpu/drm/drm_gem_shmem_helper.c @@ -357,13 +357,14 @@ static void drm_gem_shmem_vunmap_locked( if (--shmem->vmap_use_count > 0) return;
- if (obj->import_attach) + if (obj->import_attach) { dma_buf_vunmap(obj->import_attach->dmabuf, map); - else + } else { vunmap(shmem->vaddr); + drm_gem_shmem_put_pages(shmem); + }
shmem->vaddr = NULL; - drm_gem_shmem_put_pages(shmem); }
/*