1. 30 Oct, 2020 1 commit
  2. 29 Oct, 2020 10 commits
  3. 28 Oct, 2020 1 commit
    • Daniel Vetter's avatar
      drm/shme-helpers: Fix dma_buf_mmap forwarding bug · f49a51bf
      Daniel Vetter authored
      When we forward an mmap to the dma_buf exporter, they get to own
      everything. Unfortunately drm_gem_mmap_obj() overwrote
      vma->vm_private_data after the driver callback, wreaking the
      exporter complete. This was noticed because vb2_common_vm_close blew
      up on mali gpu with panfrost after commit 26d3ac3c
      ("drm/shmem-helpers: Redirect mmap for imported dma-buf").
      
      Unfortunately drm_gem_mmap_obj also acquires a surplus reference that
      we need to drop in shmem helpers, which is a bit of a mislayer
      situation. Maybe the entire dma_buf_mmap forwarding should be pulled
      into core gem code.
      
      Note that the only two other drivers which forward mmap in their own
      code (etnaviv and exynos) get this somewhat right by overwriting the
      gem mmap code. But they seem to still have the leak. This might be a
      good excuse to move these drivers over to shmem helpers completely.
      Reviewed-by: default avatarBoris Brezillon <boris.brezillon@collabora.com>
      Acked-by: default avatarChristian König <christian.koenig@amd.com>
      Cc: Christian König <christian.koenig@amd.com>
      Cc: Sumit Semwal <sumit.semwal@linaro.org>
      Cc: Lucas Stach <l.stach@pengutronix.de>
      Cc: Russell King <linux+etnaviv@armlinux.org.uk>
      Cc: Christian Gmeiner <christian.gmeiner@gmail.com>
      Cc: Inki Dae <inki.dae@samsung.com>
      Cc: Joonyoung Shim <jy0922.shim@samsung.com>
      Cc: Seung-Woo Kim <sw0312.kim@samsung.com>
      Cc: Kyungmin Park <kyungmin.park@samsung.com>
      Fixes: 26d3ac3c ("drm/shmem-helpers: Redirect mmap for imported dma-buf")
      Cc: Boris Brezillon <boris.brezillon@collabora.com>
      Cc: Thomas Zimmermann <tzimmermann@suse.de>
      Cc: Gerd Hoffmann <kraxel@redhat.com>
      Cc: Rob Herring <robh@kernel.org>
      Cc: dri-devel@lists.freedesktop.org
      Cc: linux-media@vger.kernel.org
      Cc: linaro-mm-sig@lists.linaro.org
      Cc: <stable@vger.kernel.org> # v5.9+
      Reported-and-tested-by: piotr.oniszczuk@gmail.com
      Cc: piotr.oniszczuk@gmail.com
      Signed-off-by: default avatarDaniel Vetter <daniel.vetter@intel.com>
      Link: https://patchwork.freedesktop.org/patch/msgid/20201027214922.3566743-1-daniel.vetter@ffwll.ch
      f49a51bf
  4. 27 Oct, 2020 12 commits
  5. 26 Oct, 2020 16 commits