[PATCH net-next v5 1/2] net: hns: support deferred probe when can not obtain irq

[Yankejian]

From: lipeng <lipeng...@huawei.com>

In the hip06 and hip07 SoCs, the interrupt lines from the
DSAF controllers are connected to mbigen hw module.
The mbigen module is probed with module_init, and, as such,
is not guaranteed to probe before the HNS driver. So we need
to support deferred probe.

Signed-off-by: lipeng <lipeng...@huawei.com>
Reviewed-by: Yisen Zhuang <yisen.zhu...@huawei.com>
Reviewed-by: Matthias Brugger <mbrug...@suse.com>
---
change log:
V4 -> V5:
1. Float on net-next;

V3 -> V4:
1. Delete redundant commit message;
2. add Reviewed-by: Matthias Brugger <mbrug...@suse.com>;

V2 -> V3:
1. Check return value when  platform_get_irq in hns_rcb_get_cfg;
---
 drivers/net/ethernet/hisilicon/hns/hns_dsaf_ppe.c | 4 +++-
 drivers/net/ethernet/hisilicon/hns/hns_dsaf_rcb.c | 8 +++++++-
 drivers/net/ethernet/hisilicon/hns/hns_dsaf_rcb.h | 2 +-
 3 files changed, 11 insertions(+), 3 deletions(-)

diff --git a/drivers/net/ethernet/hisilicon/hns/hns_dsaf_ppe.c 
b/drivers/net/ethernet/hisilicon/hns/hns_dsaf_ppe.c
index eba406b..93e71e2 100644
--- a/drivers/net/ethernet/hisilicon/hns/hns_dsaf_ppe.c
+++ b/drivers/net/ethernet/hisilicon/hns/hns_dsaf_ppe.c
@@ -510,7 +510,9 @@ int hns_ppe_init(struct dsaf_device *dsaf_dev)
 
                hns_ppe_get_cfg(dsaf_dev->ppe_common[i]);
 
-               hns_rcb_get_cfg(dsaf_dev->rcb_common[i]);
+               ret = hns_rcb_get_cfg(dsaf_dev->rcb_common[i]);
+               if (ret)
+                       goto get_cfg_fail;
        }
 
        for (i = 0; i < HNS_PPE_COM_NUM; i++)
diff --git a/drivers/net/ethernet/hisilicon/hns/hns_dsaf_rcb.c 
b/drivers/net/ethernet/hisilicon/hns/hns_dsaf_rcb.c
index c20a0f4..e2e2853 100644
--- a/drivers/net/ethernet/hisilicon/hns/hns_dsaf_rcb.c
+++ b/drivers/net/ethernet/hisilicon/hns/hns_dsaf_rcb.c
@@ -492,7 +492,7 @@ static int hns_rcb_get_base_irq_idx(struct rcb_common_cb 
*rcb_common)
  *hns_rcb_get_cfg - get rcb config
  *@rcb_common: rcb common device
  */
-void hns_rcb_get_cfg(struct rcb_common_cb *rcb_common)
+int hns_rcb_get_cfg(struct rcb_common_cb *rcb_common)
 {
        struct ring_pair_cb *ring_pair_cb;
        u32 i;
@@ -517,10 +517,16 @@ void hns_rcb_get_cfg(struct rcb_common_cb *rcb_common)
                ring_pair_cb->virq[HNS_RCB_IRQ_IDX_RX] =
                is_ver1 ? platform_get_irq(pdev, base_irq_idx + i * 2 + 1) :
                          platform_get_irq(pdev, base_irq_idx + i * 3);
+               if ((ring_pair_cb->virq[HNS_RCB_IRQ_IDX_TX] == -EPROBE_DEFER) ||
+                   (ring_pair_cb->virq[HNS_RCB_IRQ_IDX_RX] == -EPROBE_DEFER))
+                       return -EPROBE_DEFER;
+
                ring_pair_cb->q.phy_base =
                        RCB_COMM_BASE_TO_RING_BASE(rcb_common->phy_base, i);
                hns_rcb_ring_pair_get_cfg(ring_pair_cb);
        }
+
+       return 0;
 }
 
 /**
diff --git a/drivers/net/ethernet/hisilicon/hns/hns_dsaf_rcb.h 
b/drivers/net/ethernet/hisilicon/hns/hns_dsaf_rcb.h
index a664ee8..6028164 100644
--- a/drivers/net/ethernet/hisilicon/hns/hns_dsaf_rcb.h
+++ b/drivers/net/ethernet/hisilicon/hns/hns_dsaf_rcb.h
@@ -121,7 +121,7 @@ struct rcb_common_cb {
 void hns_rcb_common_free_cfg(struct dsaf_device *dsaf_dev, u32 comm_index);
 int hns_rcb_common_init_hw(struct rcb_common_cb *rcb_common);
 void hns_rcb_start(struct hnae_queue *q, u32 val);
-void hns_rcb_get_cfg(struct rcb_common_cb *rcb_common);
+int hns_rcb_get_cfg(struct rcb_common_cb *rcb_common);
 void hns_rcb_get_queue_mode(enum dsaf_mode dsaf_mode,
                            u16 *max_vfn, u16 *max_q_per_vf);
 
-- 
1.9.1