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[ Upstream commit6030363199] In vdc_port_probe(), we should check the return value of mdesc_grab() as it may return NULL, which can cause potential NPD bug. Fixes:43fdf27470("[SPARC64]: Abstract out mdesc accesses for better MD update handling.") Signed-off-by: Liang He <windhl@126.com> Link: https://lore.kernel.org/r/20230315062032.1741692-1-windhl@126.com [axboe: style cleanup] Signed-off-by: Jens Axboe <axboe@kernel.dk> Signed-off-by: Sasha Levin <sashal@kernel.org>