Merge branch 'etnaviv/fixes' of https://git.pengutronix.de/git/lst/linux into drm-fixes

a single fix to keep fence seqnos of completed jobs monotonically
increasing, as expected in various locations of the driver code. Also
tagged for stable.

* 'etnaviv/fixes' of https://git.pengutronix.de/git/lst/linux:
  drm/etnaviv: (re-)protect fence allocation with GPU mutex