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01d7a35687
If we have nested or circular eventfd wakeups, then we can deadlock if we run them inline from our poll waitqueue wakeup handler. It's also possible to have very long chains of notifications, to the extent where we could risk blowing the stack. Check the eventfd recursion count before calling eventfd_signal(). If it's non-zero, then punt the signaling to async context. This is always safe, as it takes us out-of-line in terms of stack and locking context. Cc: stable@vger.kernel.org # 4.19+ Reviewed-by: Jeff Moyer <jmoyer@redhat.com> Signed-off-by: Jens Axboe <axboe@kernel.dk>
2271 lines
56 KiB
2271 lines
56 KiB