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RDMA/uverbs: Make the event_queue fds return POLLERR when disassociated

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[ Upstream commit eb356e6dc15a30af604f052cd0e170450193c254 ]

If is_closed is set, and the event list is empty, then read() will return
-EIO without blocking. After setting is_closed in
ib_uverbs_free_event_queue(), we do trigger a wake_up on the poll_wait,
but the fops->poll() function does not check it, so poll will continue to
sleep on an empty list.

Fixes: 14e23bd6d221 ("RDMA/core: Fix locking in ib_uverbs_event_read")
Link: https://lore.kernel.org/r/0-v1-ace813388969+48859-uverbs_poll_fix%25jgg@mellanox.com
Reviewed-by: Leon Romanovsky <leonro@mellanox.com>
Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Jason Gunthorpe 2020-04-06 21:44:26 -03:00 • committed by Greg Kroah-Hartman
commit f23be4d155
1 changed files with 2 additions and 0 deletions
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2
drivers/infiniband/core/uverbs_main.c
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@ -307,6 +307,8 @@ static __poll_t ib_uverbs_event_poll(struct ib_uverbs_event_queue *ev_queue,
spin_lock_irq(&ev_queue->lock);
if (!list_empty(&ev_queue->event_list))
pollflags = EPOLLIN | EPOLLRDNORM;
else if (ev_queue->is_closed)
pollflags = EPOLLERR;
spin_unlock_irq(&ev_queue->lock);
return pollflags;