RDMA/ucma: Add missing locking around rdma_leave_multicast()

All entry points to the rdma_cm from a ULP must be single threaded,
even this error unwinds. Add the missing locking.

Fixes: 7c11910783a1 ("RDMA/ucma: Put a lock around every call to the rdma_cm layer")
Link: https://lore.kernel.org/r/20200818120526.702120-11-leon@kernel.org
Signed-off-by: Leon Romanovsky <leonro@mellanox.com>
Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>

diff --git a/drivers/infiniband/core/ucma.c b/drivers/infiniband/core/ucma.c
index ca5c44cac48c0e19d92b6647c693d320aa9237d6..ad78b05de656c9d52d3357e11cce967e8f1888fb 100644 (file)
--- a/drivers/infiniband/core/ucma.c
+++ b/drivers/infiniband/core/ucma.c
@@ -1535,7 +1535,9 @@ static ssize_t ucma_process_join(struct ucma_file *file,
        return 0;
 
 err3:
+       mutex_lock(&ctx->mutex);
        rdma_leave_multicast(ctx->cm_id, (struct sockaddr *) &mc->addr);
+       mutex_unlock(&ctx->mutex);
        ucma_cleanup_mc_events(mc);
 err2:
        xa_erase(&multicast_table, mc->id);