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由 Martin Krause 提交于
Test if a lock or unlock function is present (pointer not NULL) before calling it, to prevent a kernel dump. Artem: removed extra blank lines Signed-off-by: NMartin Krause <martin.krause@tqs.de> Signed-off-by: NArtem Bityutskiy <Artem.Bityutskiy@nokia.com> Signed-off-by: NDavid Woodhouse <David.Woodhouse@intel.com>
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