From: Sasha Levin <sashal@kernel.org>
To: linux-kernel@vger.kernel.org, stable@vger.kernel.org
Cc: Jason Gunthorpe <jgg@mellanox.com>,
Leon Romanovsky <leonro@mellanox.com>,
Sasha Levin <sashal@kernel.org>,
linux-rdma@vger.kernel.org
Subject: [PATCH AUTOSEL 4.19 004/172] RDMA/uverbs: Make the event_queue fds return POLLERR when disassociated
Date: Wed, 17 Jun 2020 21:19:30 -0400 [thread overview]
Message-ID: <20200618012218.607130-4-sashal@kernel.org> (raw)
In-Reply-To: <20200618012218.607130-1-sashal@kernel.org>
From: Jason Gunthorpe <jgg@mellanox.com>
[ 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>
---
drivers/infiniband/core/uverbs_main.c | 2 ++
1 file changed, 2 insertions(+)
diff --git a/drivers/infiniband/core/uverbs_main.c b/drivers/infiniband/core/uverbs_main.c
index 5404717998b0..fc4b46258c75 100644
--- a/drivers/infiniband/core/uverbs_main.c
+++ b/drivers/infiniband/core/uverbs_main.c
@@ -360,6 +360,8 @@ 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;
--
2.25.1
next parent reply other threads:[~2020-06-18 2:07 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <20200618012218.607130-1-sashal@kernel.org>
2020-06-18 1:19 ` Sasha Levin [this message]
2020-06-18 1:19 ` [PATCH AUTOSEL 4.19 029/172] RDMA/mlx5: Add init2init as a modify command Sasha Levin
2020-06-18 1:21 ` [PATCH AUTOSEL 4.19 110/172] IB/cma: Fix ports memory leak in cma_configfs Sasha Levin
2020-06-18 1:21 ` [PATCH AUTOSEL 4.19 117/172] RDMA/iw_cxgb4: cleanup device debugfs entries on ULD remove Sasha Levin
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