From: Jason Gunthorpe jgg@nvidia.com
[ Upstream commit f553246f7f794675da1794ae7ee07d1f35e561ae ]
Currently it triggers a WARN_ON and then goes ahead and destroys the uobject anyhow, leaking any driver memory.
The only place that leaks driver memory should be during FD close() in uverbs_destroy_ufile_hw().
Drivers are only allowed to fail destroy uobjects if they guarantee destroy will eventually succeed. uverbs_destroy_ufile_hw() provides the loop to give the driver that chance.
Link: https://lore.kernel.org/r/20200902081708.746631-1-leon@kernel.org Signed-off-by: Leon Romanovsky leonro@nvidia.com Signed-off-by: Jason Gunthorpe jgg@nvidia.com Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/infiniband/core/rdma_core.c | 30 ++++++++++++++--------------- include/rdma/ib_verbs.h | 5 ----- 2 files changed, 15 insertions(+), 20 deletions(-)
diff --git a/drivers/infiniband/core/rdma_core.c b/drivers/infiniband/core/rdma_core.c index 6d3ed7c6e19eb..3962da54ffbf4 100644 --- a/drivers/infiniband/core/rdma_core.c +++ b/drivers/infiniband/core/rdma_core.c @@ -130,17 +130,6 @@ static int uverbs_destroy_uobject(struct ib_uobject *uobj, lockdep_assert_held(&ufile->hw_destroy_rwsem); assert_uverbs_usecnt(uobj, UVERBS_LOOKUP_WRITE);
- if (reason == RDMA_REMOVE_ABORT_HWOBJ) { - reason = RDMA_REMOVE_ABORT; - ret = uobj->uapi_object->type_class->destroy_hw(uobj, reason, - attrs); - /* - * Drivers are not permitted to ignore RDMA_REMOVE_ABORT, see - * ib_is_destroy_retryable, cleanup_retryable == false here. - */ - WARN_ON(ret); - } - if (reason == RDMA_REMOVE_ABORT) { WARN_ON(!list_empty(&uobj->list)); WARN_ON(!uobj->context); @@ -674,11 +663,22 @@ void rdma_alloc_abort_uobject(struct ib_uobject *uobj, bool hw_obj_valid) { struct ib_uverbs_file *ufile = uobj->ufile; + int ret; + + if (hw_obj_valid) { + ret = uobj->uapi_object->type_class->destroy_hw( + uobj, RDMA_REMOVE_ABORT, attrs); + /* + * If the driver couldn't destroy the object then go ahead and + * commit it. Leaking objects that can't be destroyed is only + * done during FD close after the driver has a few more tries to + * destroy it. + */ + if (WARN_ON(ret)) + return rdma_alloc_commit_uobject(uobj, attrs); + }
- uverbs_destroy_uobject(uobj, - hw_obj_valid ? RDMA_REMOVE_ABORT_HWOBJ : - RDMA_REMOVE_ABORT, - attrs); + uverbs_destroy_uobject(uobj, RDMA_REMOVE_ABORT, attrs);
/* Matches the down_read in rdma_alloc_begin_uobject */ up_read(&ufile->hw_destroy_rwsem); diff --git a/include/rdma/ib_verbs.h b/include/rdma/ib_verbs.h index ef2f3986c4933..f1a072cc9fc0e 100644 --- a/include/rdma/ib_verbs.h +++ b/include/rdma/ib_verbs.h @@ -1489,11 +1489,6 @@ enum rdma_remove_reason { RDMA_REMOVE_DRIVER_REMOVE, /* uobj is being cleaned-up before being committed */ RDMA_REMOVE_ABORT, - /* - * uobj has been fully created, with the uobj->object set, but is being - * cleaned up before being comitted - */ - RDMA_REMOVE_ABORT_HWOBJ, };
struct ib_rdmacg_object {