[dpdk-stable] patch 'net/i40e: fix intr callback unregister by adding retry' has been queued to LTS release 17.11.2

[Yuanhan Liu]

Hi,

FYI, your patch has been queued to LTS release 17.11.2

Note it hasn't been pushed to http://dpdk.org/browse/dpdk-stable yet.
It will be pushed if I get no objections before 04/29/18. So please
shout if anyone has objections.

Thanks.

	--yliu

---
>From ed3b62da2a97cf8edbade91d0675f4a833b156bd Mon Sep 17 00:00:00 2001
From: Yunjian Wang <wangyunjian at huawei.com>
Date: Tue, 20 Mar 2018 15:01:24 +0800
Subject: [PATCH] net/i40e: fix intr callback unregister by adding retry

[ upstream commit 0264539dce2d40d8abaed474d4b1b526ca3ed2e4 ]

The nic's interrupt source has some active callbacks, when
the port hotplug. Add a retry to give more port's a chance
to uninit before returning an error.

Fixes: d42aaf30008b ("i40e: support port hotplug")

Signed-off-by: Yunjian Wang <wangyunjian at huawei.com>
Reviewed-by: Kirill Rybalchenko <kirill.rybalchenko at intel.com>
Acked-by: Qi Zhang <qi.z.zhang at intel.com>
---
 drivers/net/i40e/i40e_ethdev.c | 18 +++++++++++++++---
 1 file changed, 15 insertions(+), 3 deletions(-)

diff --git a/drivers/net/i40e/i40e_ethdev.c b/drivers/net/i40e/i40e_ethdev.c
index ef6470814..8383adefe 100644
--- a/drivers/net/i40e/i40e_ethdev.c
+++ b/drivers/net/i40e/i40e_ethdev.c
@@ -1554,6 +1554,7 @@ eth_i40e_dev_uninit(struct rte_eth_dev *dev)
 	struct rte_flow *p_flow;
 	int ret;
 	uint8_t aq_fail = 0;
+	int retries = 0;
 
 	PMD_INIT_FUNC_TRACE();
 
@@ -1595,9 +1596,20 @@ eth_i40e_dev_uninit(struct rte_eth_dev *dev)
 	/* disable uio intr before callback unregister */
 	rte_intr_disable(intr_handle);
 
-	/* register callback func to eal lib */
-	rte_intr_callback_unregister(intr_handle,
-				     i40e_dev_interrupt_handler, dev);
+	/* unregister callback func to eal lib */
+	do {
+		ret = rte_intr_callback_unregister(intr_handle,
+				i40e_dev_interrupt_handler, dev);
+		if (ret >= 0) {
+			break;
+		} else if (ret != -EAGAIN) {
+			PMD_INIT_LOG(ERR,
+				 "intr callback unregister failed: %d",
+				 ret);
+			return ret;
+		}
+		i40e_msec_delay(500);
+	} while (retries++ < 5);
 
 	i40e_rm_ethtype_filter_list(pf);
 	i40e_rm_tunnel_filter_list(pf);
-- 
2.11.0