[Intel-gfx] [PATCH] drm/i915/gt: Pull release of node->age under the spinlock

[Matthew Auld]

On Thu, 30 Jul 2020 at 14:41, Chris Wilson <chris at chris-wilson.co.uk> wrote:
>
> We need to ensure that the list is valid prior to marking the node as
> retrievable, otherwise we may see two threads compete over the same node
> in intel_gt_get_buffer_pool(). If the first thread acquires and releases
> the node in the same jiffie, the second thread may then acquire it (as
> the jiffie now again matches the expected value) and claim the node
> before it is put back into the list.
>
> Signed-off-by: Chris Wilson <chris at chris-wilson.co.uk>
Reviewed-by: Matthew Auld <matthew.auld at intel.com>