The ->poll_mask() operation has a mask of events that the caller is interested in, but we're returning all events regardless.
Change to return only the events the caller is interested in. This fixes aio IO_CMD_POLL returning immediately when called with POLLIN on an eventfd, since an eventfd is almost always ready for a write. Signed-off-by: Avi Kivity <[email protected]> --- fs/eventfd.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/fs/eventfd.c b/fs/eventfd.c index 61c9514da5e9..ceb1031f1cac 100644 --- a/fs/eventfd.c +++ b/fs/eventfd.c @@ -154,15 +154,15 @@ static __poll_t eventfd_poll_mask(struct file *file, __poll_t eventmask) * eventfd_poll returns 0 */ count = READ_ONCE(ctx->count); if (count > 0) - events |= EPOLLIN; + events |= (EPOLLIN & eventmask); if (count == ULLONG_MAX) events |= EPOLLERR; if (ULLONG_MAX - 1 > count) - events |= EPOLLOUT; + events |= (EPOLLOUT & eventmask); return events; } static void eventfd_ctx_do_read(struct eventfd_ctx *ctx, __u64 *cnt) -- 2.14.4
