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drm/i915/fence: Use rcu to defer freeing of irq_work

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It is illegal to perform an immediate free of the struct irq_work from
inside the irq_work callback (as irq_work_run_list modifies work->flags
after execution of the work->func()). As we use the irq_work to
coordinate the freeing of the callback from two different softirq paths,
we need to defer the kfree from inside our irq_work callback, for which
we can use kfree_rcu.

Fixes: 81c0ed21aa ("drm/i915/fence: Avoid del_timer_sync() from inside a timer")
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
Cc: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
Reviewed-by: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20171213094802.28243-1-chris@chris-wilson.co.uk
(cherry picked from commit 7d622351c9)
Signed-off-by: Jani Nikula <jani.nikula@intel.com>
This commit is contained in:
Chris Wilson 2017-12-13 09:48:02 +00:00 committed by Jani Nikula
parent 74c7b0782b
commit 2cf654db8d
1 changed files with 2 additions and 1 deletions
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3
drivers/gpu/drm/i915/i915_sw_fence.c
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@ -367,6 +367,7 @@ struct i915_sw_dma_fence_cb {
struct dma_fence *dma;
struct timer_list timer;
struct irq_work work;
struct rcu_head rcu;
};
static void timer_i915_sw_fence_wake(struct timer_list *t)
@ -406,7 +407,7 @@ static void irq_i915_sw_fence_work(struct irq_work *wrk)
del_timer_sync(&cb->timer);
dma_fence_put(cb->dma);
kfree(cb);
kfree_rcu(cb, rcu);
}
int i915_sw_fence_await_dma_fence(struct i915_sw_fence *fence,