net: atlantic: make hw_get_regs optional

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

Signed-off-by: Mark Starovoytov <mstarovoitov@marvell.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/drivers/net/ethernet/aquantia/atlantic/aq_nic.c b/drivers/net/ethernet/aquantia/atlantic/aq_nic.c
index 57102f35e9f3591acb676cf28e1d952d4f88f048..2dbea5cd7684e566d4b5fe9e0e7f62ec960587cc 100644 (file)
--- 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 @@ err_exit:
 
 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;
 }