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| author | Chris Wilson <chris@chris-wilson.co.uk> | 2019-05-28 16:40:53 +0100 |
|---|---|---|
| committer | Chris Wilson <chris@chris-wilson.co.uk> | 2019-05-29 13:15:39 +0100 |
| commit | 0c1f845772e5d6d1b1739cb938403527bc6b29e1 (patch) | |
| tree | 04083e57f7dc8179291ec79897244e4a5f3a1b56 /tools/perf/scripts/python/bin/stackcollapse-record | |
| parent | 81a04d2e9091832710549176db0e46d1a666f9ae (diff) | |
| download | linux-0c1f845772e5d6d1b1739cb938403527bc6b29e1.tar.gz linux-0c1f845772e5d6d1b1739cb938403527bc6b29e1.zip | |
drm/i915: Avoid refcount_inc on known zero count
In intel_wakeref_auto, we use refcount_inc_not_zero to detect the first
use and initialise the timer. On doing so, we have to avoid using
refcount_inc on that zero count as the debug code flags that as an
error:
refcount_t: increment on 0; use-after-free.
Rearrange the code so that if we know the count is 0 and we are
initialising, we explicitly set it to 1.
Fixes: b27e35ae5b18 ("drm/i915: Keep user GGTT alive for a minimum of 250ms")
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Mika Kuoppala <mika.kuoppala@linux.intel.com>
Reviewed-by: Mika Kuoppala <mika.kuoppala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20190528154053.22004-1-chris@chris-wilson.co.uk
Diffstat (limited to 'tools/perf/scripts/python/bin/stackcollapse-record')
0 files changed, 0 insertions, 0 deletions