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| author | Chris Wilson <chris@chris-wilson.co.uk> | 2020-02-03 12:41:47 +0300 |
|---|---|---|
| committer | Chris Wilson <chris@chris-wilson.co.uk> | 2020-02-03 14:25:39 +0300 |
| commit | 30ca04e16cbeea7401dabc51e53b92975144e436 (patch) | |
| tree | 637508a1efec53596a06c8fcc2bc94b0c45342f2 /drivers/gpu/drm/i915/i915_active.c | |
| parent | 6a79c28936dfc44019d42e36aaf8acd9c38f66c2 (diff) | |
| download | linux-30ca04e16cbeea7401dabc51e53b92975144e436.tar.xz | |
drm/i915: Hold reference to previous active fence as we queue
Take a reference to the previous exclusive fence on the i915_active, as
we wish to add an await to it in the caller (and so must prevent it from
being freed until we have completed that task).
Fixes: e3793468b466 ("drm/i915: Use the async worker to avoid reclaim tainting the ggtt->mutex")
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Matthew Auld <matthew.auld@intel.com>
Reviewed-by: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20200203094152.4150550-1-chris@chris-wilson.co.uk
Diffstat (limited to 'drivers/gpu/drm/i915/i915_active.c')
| -rw-r--r-- | drivers/gpu/drm/i915/i915_active.c | 6 |
1 files changed, 5 insertions, 1 deletions
diff --git a/drivers/gpu/drm/i915/i915_active.c b/drivers/gpu/drm/i915/i915_active.c index da58e5d084f4..9ccb931a733e 100644 --- a/drivers/gpu/drm/i915/i915_active.c +++ b/drivers/gpu/drm/i915/i915_active.c @@ -398,9 +398,13 @@ i915_active_set_exclusive(struct i915_active *ref, struct dma_fence *f) /* We expect the caller to manage the exclusive timeline ordering */ GEM_BUG_ON(i915_active_is_idle(ref)); + rcu_read_lock(); prev = __i915_active_fence_set(&ref->excl, f); - if (!prev) + if (prev) + prev = dma_fence_get_rcu(prev); + else atomic_inc(&ref->count); + rcu_read_unlock(); return prev; } |