While a perf event is open, keep a reference to the module so we don't remove the driver internals mid-sampling.
Testcase: igt/perf_pmu/module-unload Signed-off-by: Chris Wilson <[email protected]> Cc: Tvrtko Ursulin <[email protected]> Cc: [email protected] --- drivers/gpu/drm/i915/i915_pmu.c | 5 ++++- 1 file changed, 4 insertions(+), 1 deletion(-) diff --git a/drivers/gpu/drm/i915/i915_pmu.c b/drivers/gpu/drm/i915/i915_pmu.c index 83c6a8ccd2cb..e991a707bdb7 100644 --- a/drivers/gpu/drm/i915/i915_pmu.c +++ b/drivers/gpu/drm/i915/i915_pmu.c @@ -442,6 +442,7 @@ static u64 count_interrupts(struct drm_i915_private *i915) static void i915_pmu_event_destroy(struct perf_event *event) { WARN_ON(event->parent); + module_put(THIS_MODULE); } static int @@ -533,8 +534,10 @@ static int i915_pmu_event_init(struct perf_event *event) if (ret) return ret; - if (!event->parent) + if (!event->parent) { + __module_get(THIS_MODULE); event->destroy = i915_pmu_event_destroy; + } return 0; } -- 2.20.1 _______________________________________________ Intel-gfx mailing list [email protected] https://lists.freedesktop.org/mailman/listinfo/intel-gfx
