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drm/i915: Take request reference before arming the watchdog timer 

Reference needs to be taken before arming the timer. Luckily, given the
default timer period of 20s, the potential to hit the race is extremely
unlikely.

Signed-off-by: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
Fixes: 9b4d0598ee ("drm/i915: Request watchdog infrastructure")
Cc: Daniel Vetter <daniel.vetter@ffwll.ch>
Reviewed-by: Mika Kuoppala <mika.kuoppala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20210326105759.2387104-1-tvrtko.ursulin@linux.intel.com
(cherry picked from commit f7c3797791)
Signed-off-by: Jani Nikula <jani.nikula@intel.com>
This commit is contained in:
Tvrtko Ursulin 2021-03-26 10:57:59 +00:00 committed by Jani Nikula
parent e65a4d3784
commit eef24f1177
1 changed files with 2 additions and 1 deletions
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3
drivers/gpu/drm/i915/i915_request.c
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@ -350,6 +350,8 @@ static void __rq_arm_watchdog(struct i915_request *rq)
if (!ce->watchdog.timeout_us)
return;
i915_request_get(rq);
hrtimer_init(&wdg->timer, CLOCK_MONOTONIC, HRTIMER_MODE_REL);
wdg->timer.function = __rq_watchdog_expired;
hrtimer_start_range_ns(&wdg->timer,
@ -357,7 +359,6 @@ static void __rq_arm_watchdog(struct i915_request *rq)
NSEC_PER_USEC),
NSEC_PER_MSEC,
HRTIMER_MODE_REL);
i915_request_get(rq);
}
static void __rq_cancel_watchdog(struct i915_request *rq)