[ofa-general] [PATCH] core: Check that the function reg_phys_mr is not NULL before executing it

[Dotan Barak]

Check that the function reg_phys_mr is not NULL before executing it.

There are devices (for example: mlx4) that their low level driver 
doesn't support this verb, so this patch will prevent kernel oops on them.

Signed-off-by: Dotan Barak <dotanb at dev.mellanox.co.il>

---

diff --git a/drivers/infiniband/core/verbs.c b/drivers/infiniband/core/verbs.c
index 86ed8af..e2d54cb 100644
--- a/drivers/infiniband/core/verbs.c
+++ b/drivers/infiniband/core/verbs.c
@@ -672,6 +672,9 @@ struct ib_mr *ib_reg_phys_mr(struct ib_pd *pd,
 {
 	struct ib_mr *mr;
 
+	if (!pd->device->reg_phys_mr)
+		return -ENOSYS;
+
 	mr = pd->device->reg_phys_mr(pd, phys_buf_array, num_phys_buf,
 				     mr_access_flags, iova_start);