From cc2e14e68004e6dec70842f990085f67c1f6fec7 Mon Sep 17 00:00:00 2001
From: Jason Gunthorpe <jgg@mellanox.com>
Date: Wed, 25 Jul 2018 21:40:16 -0600
Subject: [PATCH] IB/uverbs: Lower the test for ongoing disassociation
Commands that are reading/writing to objects can test for an ongoing
disassociation during their initial call to rdma_lookup_get_uobject. This
directly prevents all of these commands from conflicting with an ongoing
disassociation.
Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>
---
drivers/infiniband/core/rdma_core.c | 11 +++++++++++
1 file changed, 11 insertions(+)
diff --git a/drivers/infiniband/core/rdma_core.c b/drivers/infiniband/core/rdma_core.c
index 95a8110f186fd..d4de1fed98f2f 100644
--- a/drivers/infiniband/core/rdma_core.c
+++ b/drivers/infiniband/core/rdma_core.c
@@ -449,6 +449,17 @@ struct ib_uobject *rdma_lookup_get_uobject(const struct uverbs_obj_type *type,
goto free;
}
+ /*
+ * If we have been disassociated block every command except for
+ * DESTROY based commands.
+ */
+ if (mode != UVERBS_LOOKUP_DESTROY &&
+ !srcu_dereference(ufile->device->ib_dev,
+ &ufile->device->disassociate_srcu)) {
+ ret = -EIO;
+ goto free;
+ }
+
ret = uverbs_try_lock_object(uobj, mode);
if (ret)
goto free;
--
2.30.2