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authorAvi Kivity <avi@scylladb.com>2018-06-08 22:12:32 +0300
committerAl Viro <viro@zeniv.linux.org.uk>2018-06-15 03:07:38 +0300
commit4d572d9f46507be8cfe326aa5bc3698babcbdfa7 (patch)
treedc24bf35b539ea641b700344820c84462751bfd7 /fs/eventfd.c
parent94aefd32f431a2c15f9d2c5f8f19dece73a77b52 (diff)
downloadlinux-4d572d9f46507be8cfe326aa5bc3698babcbdfa7.tar.xz
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>
Diffstat (limited to 'fs/eventfd.c')
-rw-r--r--fs/eventfd.c4
1 files 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
@@ -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;
}