diff options
| author | David Woodhouse <dwmw@amazon.co.uk> | 2020-10-27 14:55:22 +0100 |
|---|---|---|
| committer | Paolo Bonzini <pbonzini@redhat.com> | 2020-11-15 15:49:10 +0100 |
| commit | b1b397aeef8177f4f7bd91a0d5fa708f4752a499 (patch) | |
| tree | 82a2c5c8365e5e057b58fd68cfc745d17409a233 | |
| parent | eventfd: Export eventfd_ctx_do_read() (diff) | |
| download | linux-b1b397aeef8177f4f7bd91a0d5fa708f4752a499.tar.xz linux-b1b397aeef8177f4f7bd91a0d5fa708f4752a499.zip | |
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>
| -rw-r--r-- | drivers/vfio/virqfd.c | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/drivers/vfio/virqfd.c b/drivers/vfio/virqfd.c index 997cb5d0a657..414e98d82b02 100644 --- a/drivers/vfio/virqfd.c +++ b/drivers/vfio/virqfd.c @@ -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)) && |