This is a note to let you know that I've just added the patch titled RDMA/core: Fix ib_qp_usecnt_dec() called when error to the 5.15-stable tree which can be found at: http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary The filename of the patch is: rdma-core-fix-ib_qp_usecnt_dec-called-when-error.patch and it can be found in the queue-5.15 subdirectory. If you, or anyone else, feels it should not be added to the stable tree, please let <stable@xxxxxxxxxxxxxxx> know about it. commit 0898652fccd17d94db5ef672011cfad7b092f23a Author: Yajun Deng <yajun.deng@xxxxxxxxx> Date: Thu Mar 3 10:42:32 2022 +0800 RDMA/core: Fix ib_qp_usecnt_dec() called when error [ Upstream commit 7c4a539ec38f4ce400a0f3fcb5ff6c940fcd67bb ] ib_destroy_qp() would called by ib_create_qp_user() if error, the former contains ib_qp_usecnt_dec(), but ib_qp_usecnt_inc() was not called before. So move ib_qp_usecnt_inc() into create_qp(). Fixes: d2b10794fc13 ("RDMA/core: Create clean QP creations interface for uverbs") Link: https://lore.kernel.org/r/20220303024232.2847388-1-yajun.deng@xxxxxxxxx Signed-off-by: Yajun Deng <yajun.deng@xxxxxxxxx> Reviewed-by: Leon Romanovsky <leonro@xxxxxxxxxx> Signed-off-by: Jason Gunthorpe <jgg@xxxxxxxxxx> Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx> diff --git a/drivers/infiniband/core/uverbs_cmd.c b/drivers/infiniband/core/uverbs_cmd.c index d1345d76d9b1..5a99e31df5f5 100644 --- a/drivers/infiniband/core/uverbs_cmd.c +++ b/drivers/infiniband/core/uverbs_cmd.c @@ -1438,7 +1438,6 @@ static int create_qp(struct uverbs_attr_bundle *attrs, ret = PTR_ERR(qp); goto err_put; } - ib_qp_usecnt_inc(qp); obj->uevent.uobject.object = qp; obj->uevent.event_file = READ_ONCE(attrs->ufile->default_async_file); diff --git a/drivers/infiniband/core/uverbs_std_types_qp.c b/drivers/infiniband/core/uverbs_std_types_qp.c index dd1075466f61..75353e09c6fe 100644 --- a/drivers/infiniband/core/uverbs_std_types_qp.c +++ b/drivers/infiniband/core/uverbs_std_types_qp.c @@ -254,7 +254,6 @@ static int UVERBS_HANDLER(UVERBS_METHOD_QP_CREATE)( ret = PTR_ERR(qp); goto err_put; } - ib_qp_usecnt_inc(qp); if (attr.qp_type == IB_QPT_XRC_TGT) { obj->uxrcd = container_of(xrcd_uobj, struct ib_uxrcd_object, diff --git a/drivers/infiniband/core/verbs.c b/drivers/infiniband/core/verbs.c index 59e20936b800..b78cd65d20a6 100644 --- a/drivers/infiniband/core/verbs.c +++ b/drivers/infiniband/core/verbs.c @@ -1253,6 +1253,7 @@ static struct ib_qp *create_qp(struct ib_device *dev, struct ib_pd *pd, if (ret) goto err_security; + ib_qp_usecnt_inc(qp); rdma_restrack_add(&qp->res); return qp; @@ -1353,8 +1354,6 @@ struct ib_qp *ib_create_qp_kernel(struct ib_pd *pd, if (IS_ERR(qp)) return qp; - ib_qp_usecnt_inc(qp); - if (qp_init_attr->cap.max_rdma_ctxs) { ret = rdma_rw_init_mrs(qp, qp_init_attr); if (ret)