Merge tag 'drm-misc-next-2017-03-06' of git://anongit.freedesktop.org/git/drm-misc into drm-next

First slice of drm-misc-next for 4.12:

Core/subsystem-wide:
- link status core patch from Manasi, for signalling link train fail
  to userspace. I also had the i915 patch in here, but that had a
  small buglet in our CI, so reverted.
- more debugfs_remove removal from Noralf, almost there now (Noralf
  said he'll try to follow up with the stragglers).
- drm todo moved into kerneldoc, for better visibility (see
  Documentation/gpu/todo.rst), lots of starter tasks in there.
- devm_ of helpers + use it in sti (from Ben Gaignard, acked by Rob
  Herring)
- extended framebuffer fbdev support (for fbdev flipping), and vblank
  wait ioctl fbdev support (Maxime Ripard)
- misc small things all over, as usual
- add vblank callbacks to drm_crtc_funcs, plus make lots of good use
  of this to simplify drivers (Shawn Guo)
- new atomic iterator macros to unconfuse old vs. new state

Small drivers:
- vc4 improvements from Eric
- vc4 kerneldocs (Eric)!
- tons of improvements for dw-mipi-dsi in rockchip from John Keeping
  and Chris Zhong.
- MAINTAINERS entries for drivers managed in drm-misc. It's not yet
  official, still an experiment, but definitely not complete fail and
  better to avoid confusion. We kinda screwed that up with drm-misc a
  bit when we started committers last year.
- qxl atomic conversion (Gabriel Krisman)
- bunch of virtual driver polish (qxl, virgl, ...)
- misc tiny patches all over

This is the first time we've done the same merge-window blackout for
drm-misc as we've done for drm-intel for ages, hence why we have a
_lot_ of stuff queued already. But it's still only half of drm-intel
(room to grow!), and the drivers in drm-misc experiment seems to work
at least insofar as that you also get lots of driver updates here
alredy.

* tag 'drm-misc-next-2017-03-06' of git://anongit.freedesktop.org/git/drm-misc: (141 commits)
  drm/vc4: Fix OOPSes from trying to cache a partially constructed BO.
  drm/vc4: Fulfill user BO creation requests from the kernel BO cache.
  Revert "drm/i915: Implement Link Rate fallback on Link training failure"
  drm/fb-helper: implement ioctl FBIO_WAITFORVSYNC
  drm: Update drm_fbdev_cma_init documentation
  drm/rockchip/dsi: add dw-mipi power domain support
  drm/rockchip/dsi: fix insufficient bandwidth of some panel
  dt-bindings: add power domain node for dw-mipi-rockchip
  drm/rockchip/dsi: remove mode_valid function
  drm/rockchip/dsi: dw-mipi: correct the coding style
  drm/rockchip/dsi: dw-mipi: support RK3399 mipi dsi
  dt-bindings: add rk3399 support for dw-mipi-rockchip
  drm/rockchip: dw-mipi-dsi: add reset control
  drm/rockchip: dw-mipi-dsi: support non-burst modes
  drm/rockchip: dw-mipi-dsi: defer probe if panel is not loaded
  drm/rockchip: vop: test for P{H,V}SYNC
  drm/rockchip: dw-mipi-dsi: use positive check for N{H, V}SYNC
  drm/rockchip: dw-mipi-dsi: use specific poll helper
  drm/rockchip: dw-mipi-dsi: improve PLL configuration
  drm/rockchip: dw-mipi-dsi: properly configure PHY timing
  ...

1 files changed, 2 insertions, 0 deletions

diff --git a/drivers/dma-buf/dma-fence.c b/drivers/dma-buf/dma-fence.c
index d195d617076d..0918d3f003d6 100644
--- a/drivers/dma-buf/dma-fence.c
+++ b/drivers/dma-buf/dma-fence.c
@@ -240,6 +240,8 @@ EXPORT_SYMBOL(dma_fence_enable_sw_signaling);
  * after it signals with dma_fence_signal. The callback itself can be called
  * from irq context.
  *
+ * Returns 0 in case of success, -ENOENT if the fence is already signaled
+ * and -EINVAL in case of error.
  */
 int dma_fence_add_callback(struct dma_fence *fence, struct dma_fence_cb *cb,
 			   dma_fence_func_t func)