From: Jason Gunthorpe <jgg@xxxxxxxxxx>
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")
Signed-off-by: Jason Gunthorpe <jgg@xxxxxxxxxx>
Signed-off-by: Leon Romanovsky <leonro@xxxxxxxxxxxx>
---
drivers/infiniband/core/ucma.c | 2 ++
1 file changed, 2 insertions(+)
diff --git a/drivers/infiniband/core/ucma.c b/drivers/infiniband/core/ucma.c
index ca5c44cac48c..ad78b05de656 100644
--- 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);
--
2.26.2
