[Intel-gfx] [PATCH 2/4] drm/i915/pmu: Fix PMU enable vs execlists tasklet race

From: Tvrtko Ursulin Commit 99e48bf98dd0 ("drm/i915: Lock out execlist tasklet while peeking inside for busy-stats") added a tasklet_disable call in busy stats enabling, but we failed to understand that the PMU enable callback runs as an hard IRQ (IPI). Consequence of

[Intel-gfx] [PATCH 2/4] drm/i915/pmu: Fix PMU enable vs execlists tasklet race

From: Tvrtko Ursulin Commit 99e48bf98dd0 ("drm/i915: Lock out execlist tasklet while peeking inside for busy-stats") added a tasklet_disable call in busy stats enabling, but we failed to understand that the PMU enable callback runs as an hard IRQ (IPI). Consequence of