diff options
| author | Jason Gunthorpe <jgg@nvidia.com> | 2020-10-26 11:25:49 -0300 |
|---|---|---|
| committer | Jason Gunthorpe <jgg@nvidia.com> | 2020-10-28 09:14:49 -0300 |
| commit | 071ba4cc559de47160761b9500b72e8fa09d923d (patch) | |
| tree | 0433f309f2aae8e868f09260cd1647671236af85 /drivers/nvme | |
| parent | 7d66a71488d7c14506ab81d6455c095992efca04 (diff) | |
RDMA: Add rdma_connect_locked()
There are two flows for handling RDMA_CM_EVENT_ROUTE_RESOLVED, either the
handler triggers a completion and another thread does rdma_connect() or
the handler directly calls rdma_connect().
In all cases rdma_connect() needs to hold the handler_mutex, but when
handler's are invoked this is already held by the core code. This causes
ULPs using the 2nd method to deadlock.
Provide a rdma_connect_locked() and have all ULPs call it from their
handlers.
Link: https://lore.kernel.org/r/0-v2-53c22d5c1405+33-rdma_connect_locking_jgg@nvidia.com
Reported-and-tested-by: Guoqing Jiang <guoqing.jiang@cloud.ionos.com>
Fixes: 2a7cec538169 ("RDMA/cma: Fix locking for the RDMA_CM_CONNECT state")
Acked-by: Santosh Shilimkar <santosh.shilimkar@oracle.com>
Acked-by: Jack Wang <jinpu.wang@cloud.ionos.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Max Gurtovoy <mgurtovoy@nvidia.com>
Reviewed-by: Sagi Grimberg <sagi@grimberg.me>
Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>
Diffstat (limited to 'drivers/nvme')
| -rw-r--r-- | drivers/nvme/host/rdma.c | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/drivers/nvme/host/rdma.c b/drivers/nvme/host/rdma.c index aad829a2b50d..8bbc48cc45dc 100644 --- a/drivers/nvme/host/rdma.c +++ b/drivers/nvme/host/rdma.c @@ -1890,10 +1890,10 @@ static int nvme_rdma_route_resolved(struct nvme_rdma_queue *queue) priv.hsqsize = cpu_to_le16(queue->ctrl->ctrl.sqsize); } - ret = rdma_connect(queue->cm_id, ¶m); + ret = rdma_connect_locked(queue->cm_id, ¶m); if (ret) { dev_err(ctrl->ctrl.device, - "rdma_connect failed (%d).\n", ret); + "rdma_connect_locked failed (%d).\n", ret); goto out_destroy_queue_ib; } |