[PATCH 5.8 044/148] drm/i915: Provide the perf pmu.module

Greg Kroah-Hartman
2020-08-24T08:33:47Z

From: Chris Wilson <chris@chris-wilson.co.uk>

[ Upstream commit df3ab3cb7eae63c6eb7c9aebcc196a75d59f65dd ]

Rather than manually implement our own module reference counting for perf
pmu events, finally realise that there is a module parameter to struct
pmu for this very purpose.

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
Cc: stable@vger.kernel.org
Reviewed-by: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20200716094643.31410-1-chris@chris-wilson.co.uk
Signed-off-by: Rodrigo Vivi <rodrigo.vivi@intel.com>
(cherry picked from commit 27e897beec1c59861f15d4d3562c39ad1143620f)
Signed-off-by: Jani Nikula <jani.nikula@intel.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
drivers/gpu/drm/i915/i915_pmu.c | 7 ++-----
1 file changed, 2 insertions(+), 5 deletions(-)

diff --git a/drivers/gpu/drm/i915/i915_pmu.c b/drivers/gpu/drm/i915/i915_pmu.c
index 802837de1767c..9792220ddbe2e 100644
--- a/drivers/gpu/drm/i915/i915_pmu.c
+++ b/drivers/gpu/drm/i915/i915_pmu.c
@@ -445,8 +445,6 @@ static void i915_pmu_event_destroy(struct perf_event *event)
container_of(event->pmu, typeof(*i915), pmu.base);

drm_WARN_ON(&i915->drm, event->parent);
-
- module_put(THIS_MODULE);
}

static int
@@ -538,10 +536,8 @@ static int i915_pmu_event_init(struct perf_event *event)
if (ret)
return ret;

- if (!event->parent) {
- __module_get(THIS_MODULE);
+ if (!event->parent)
event->destroy = i915_pmu_event_destroy;
- }

return 0;
}
@@ -1127,6 +1123,7 @@ void i915_pmu_register(struct drm_i915_private *i915)
if (!pmu->base.attr_groups)
goto err_attr;

+ pmu->base.module = THIS_MODULE;
pmu->base.task_ctx_nr = perf_invalid_context;
pmu->base.event_init = i915_pmu_event_init;
pmu->base.add = i915_pmu_event_add;
--
2.25.1