[PATCH v2 net-next 06/17] net: atlantic: make hw_get_regs optional

[Igor Russkikh]

From: Mark Starovoytov <mstarovoi...@marvell.com>

This patch fixes potential crash in case if hw_get_regs is NULL.

Signed-off-by: Mark Starovoytov <mstarovoi...@marvell.com>
---
 drivers/net/ethernet/aquantia/atlantic/aq_nic.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/drivers/net/ethernet/aquantia/atlantic/aq_nic.c 
b/drivers/net/ethernet/aquantia/atlantic/aq_nic.c
index 57102f35e9f3..2dbea5cd7684 100644
--- a/drivers/net/ethernet/aquantia/atlantic/aq_nic.c
+++ b/drivers/net/ethernet/aquantia/atlantic/aq_nic.c
@@ -778,6 +778,9 @@ int aq_nic_get_regs(struct aq_nic_s *self, struct 
ethtool_regs *regs, void *p)
        u32 *regs_buff = p;
        int err = 0;
 
+       if (unlikely(!self->aq_hw_ops->hw_get_regs))
+               return -EOPNOTSUPP;
+
        regs->version = 1;
 
        err = self->aq_hw_ops->hw_get_regs(self->aq_hw,
@@ -792,6 +795,9 @@ int aq_nic_get_regs(struct aq_nic_s *self, struct 
ethtool_regs *regs, void *p)
 
 int aq_nic_get_regs_count(struct aq_nic_s *self)
 {
+       if (unlikely(!self->aq_hw_ops->hw_get_regs))
+               return 0;
+
        return self->aq_nic_cfg.aq_hw_caps->mac_regs_count;
 }
 
-- 
2.20.1