[PATCH rdma-rc v2 15/15] RDMA/bnxt_re: Reject GET_TOGGLE_MEM when toggle page was not allocated

[Selvin Xavier <selvin.xavier@broadcom.com>]

If a user calls BNXT_RE_METHOD_GET_TOGGLE_MEM on a device that does not
support the CQ/SRQ toggle feature, uctx_cq_page or uctx_srq_page will
be NULL.

Add an explicit -EOPNOTSUPP return after capturing the address from
uctx_cq_page / uctx_srq_page if the address is zero.

Fixes: e275919d9669 ("RDMA/bnxt_re: Share a page to expose per CQ info with userspace")
Fixes: 181028a0d84c ("RDMA/bnxt_re: Share a page to expose per SRQ info with userspace")
Signed-off-by: Selvin Xavier <selvin.xavier@broadcom.com>
---
 drivers/infiniband/hw/bnxt_re/uapi.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/drivers/infiniband/hw/bnxt_re/uapi.c b/drivers/infiniband/hw/bnxt_re/uapi.c
index ef41d6a1a0bb..37997c36c6f8 100644
--- a/drivers/infiniband/hw/bnxt_re/uapi.c
+++ b/drivers/infiniband/hw/bnxt_re/uapi.c
@@ -289,6 +289,8 @@ static int UVERBS_HANDLER(BNXT_RE_METHOD_GET_TOGGLE_MEM)(struct uverbs_attr_bund
 
 		addr = (u64)cq->uctx_cq_page;
 		bnxt_re_put_cq(cq);
+		if (!addr)
+			return -EOPNOTSUPP;
 		break;
 	case BNXT_RE_SRQ_TOGGLE_MEM:
 		srq = bnxt_re_search_for_srq(rdev, res_id);
@@ -302,6 +304,8 @@ static int UVERBS_HANDLER(BNXT_RE_METHOD_GET_TOGGLE_MEM)(struct uverbs_attr_bund
 
 		addr = (u64)srq->uctx_srq_page;
 		bnxt_re_put_srq(srq);
+		if (!addr)
+			return -EOPNOTSUPP;
 		break;
 
 	default:
-- 
2.39.3