From: Jason Gunthorpe <jgg@xxxxxxxxxxxx>
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@xxxxxxxxxxxx>
---
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 95a8110f186fdf..d4de1fed98f2fb 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;
--
2.18.0
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