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| author | Jason Gunthorpe <jgg@nvidia.com> | 2020-10-26 15:25:49 +0100 |
|---|---|---|
| committer | Jason Gunthorpe <jgg@nvidia.com> | 2020-10-28 13:14:49 +0100 |
| commit | 071ba4cc559de47160761b9500b72e8fa09d923d (patch) | |
| tree | 0433f309f2aae8e868f09260cd1647671236af85 /net/rds/ib_cm.c | |
| parent | RDMA/uverbs: Fix false error in query gid IOCTL (diff) | |
| download | linux-071ba4cc559de47160761b9500b72e8fa09d923d.tar.xz linux-071ba4cc559de47160761b9500b72e8fa09d923d.zip | |
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 'net/rds/ib_cm.c')
| -rw-r--r-- | net/rds/ib_cm.c | 5 |
1 files changed, 3 insertions, 2 deletions
diff --git a/net/rds/ib_cm.c b/net/rds/ib_cm.c index 06603dd1c8aa..b36b60668b1d 100644 --- a/net/rds/ib_cm.c +++ b/net/rds/ib_cm.c @@ -956,9 +956,10 @@ int rds_ib_cm_initiate_connect(struct rdma_cm_id *cm_id, bool isv6) rds_ib_cm_fill_conn_param(conn, &conn_param, &dp, conn->c_proposed_version, UINT_MAX, UINT_MAX, isv6); - ret = rdma_connect(cm_id, &conn_param); + ret = rdma_connect_locked(cm_id, &conn_param); if (ret) - rds_ib_conn_error(conn, "rdma_connect failed (%d)\n", ret); + rds_ib_conn_error(conn, "rdma_connect_locked failed (%d)\n", + ret); out: /* Beware - returning non-zero tells the rdma_cm to destroy |