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vfio/virqfd: Drain events from eventfd in virqfd_wakeup() 

Don't allow the events to accumulate in the eventfd counter, drain them
as they are handled.

Signed-off-by: David Woodhouse <dwmw@amazon.co.uk>
Message-Id: <20201027135523.646811-3-dwmw2@infradead.org>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Acked-by: Alex Williamson <alex.williamson@redhat.com>
This commit is contained in:
David Woodhouse 2020-10-27 13:55:22 +00:00 committed by Paolo Bonzini
parent 28f1326710
commit b1b397aeef
1 changed files with 3 additions and 0 deletions
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3
drivers/vfio/virqfd.c
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@ -46,6 +46,9 @@ static int virqfd_wakeup(wait_queue_entry_t *wait, unsigned mode, int sync, void
__poll_t flags = key_to_poll(key);
if (flags & EPOLLIN) {
u64 cnt;
eventfd_ctx_do_read(virqfd->eventfd, &cnt);
/* An event has been signaled, call function */
if ((!virqfd->handler ||
virqfd->handler(virqfd->opaque, virqfd->data)) &&