This is a note to let you know that I've just added the patch titled

drm/omap: fix dmabuf mmap for dma_alloc'ed buffers

to the 4.4-stable tree which can be found at: http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git%3Ba=su...

The filename of the patch is: drm-omap-fix-dmabuf-mmap-for-dma_alloc-ed-buffers.patch and it can be found in the queue-4.4 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree, please let stable@vger.kernel.org know about it.

From foo@baz Mon Dec 18 14:47:43 CET 2017

From: Tomi Valkeinen tomi.valkeinen@ti.com Date: Tue, 28 Feb 2017 10:11:45 +0200 Subject: drm/omap: fix dmabuf mmap for dma_alloc'ed buffers

From: Tomi Valkeinen tomi.valkeinen@ti.com

[ Upstream commit 9fa1d7537242bd580ffa99c4725a0407096aad26 ]

omap_gem_dmabuf_mmap() returns an error (with a WARN) when called for a buffer which is allocated with dma_alloc_*(). This prevents dmabuf mmap from working on SoCs without DMM, e.g. AM4 and OMAP3.

I could not find any reason for omap_gem_dmabuf_mmap() rejecting such buffers, and just removing the if() fixes the limitation.

Signed-off-by: Tomi Valkeinen tomi.valkeinen@ti.com Signed-off-by: Sasha Levin alexander.levin@verizon.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- drivers/gpu/drm/omapdrm/omap_gem_dmabuf.c | 3 --- 1 file changed, 3 deletions(-)

--- a/drivers/gpu/drm/omapdrm/omap_gem_dmabuf.c +++ b/drivers/gpu/drm/omapdrm/omap_gem_dmabuf.c @@ -142,9 +142,6 @@ static int omap_gem_dmabuf_mmap(struct d struct drm_gem_object *obj = buffer->priv; int ret = 0;

- if (WARN_ON(!obj->filp)) - return -EINVAL; - ret = drm_gem_mmap_obj(obj, omap_gem_mmap_size(obj), vma); if (ret < 0) return ret;

Patches currently in stable-queue which might be from tomi.valkeinen@ti.com are

queue-4.4/drm-omap-fix-dmabuf-mmap-for-dma_alloc-ed-buffers.patch