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eventfd: only return events requested in poll_mask() 

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 <avi@scylladb.com>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Avi Kivity 2018-06-08 22:12:32 +03:00 committed by Al Viro
parent 94aefd32f4
commit 4d572d9f46
1 changed files with 2 additions and 2 deletions
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4
fs/eventfd.c
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@ -156,11 +156,11 @@ static __poll_t eventfd_poll_mask(struct file *file, __poll_t eventmask)
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;
}