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由 Jens Axboe 提交于
The outer poll loop checks for whether we need to reschedule, and returns to userspace if we do. However, it's possible to get stuck in the inner loop as well, if the CPU we are running on needs to reschedule to finish the IO work. Add the need_resched() check in the inner loop as well. This fixes a potential hang if the kernel is configured with CONFIG_PREEMPT_VOLUNTARY=y. Reported-by: NSagi Grimberg <sagi@grimberg.me> Reviewed-by: NSagi Grimberg <sagi@grimberg.me> Tested-by: NSagi Grimberg <sagi@grimberg.me> Signed-off-by: NJens Axboe <axboe@kernel.dk>
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