netdev - [PATCH 5/5 net-next] ibmvnic: Exit polling routine correctly during adapter reset

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Message-Id: <1497497748-14075-5-git-send-email-tlfalcon@linux.vnet.ibm.com>
Date:   Wed, 14 Jun 2017 22:35:48 -0500
From:   Thomas Falcon <tlfalcon@...ux.vnet.ibm.com>
To:     netdev@...r.kernel.org
Cc:     nfont@...ux.vnet.ibm.com, jallen@...ux.vnet.ibm.com,
        Thomas Falcon <tlfalcon@...ux.vnet.ibm.com>
Subject: [PATCH 5/5 net-next] ibmvnic: Exit polling routine correctly during adapter reset

This patch fixes a bug where, in the case of a device reset,
the polling routine will never complete, causing napi_disable
to sleep indefinitely when attempting to close the device. 

Signed-off-by: Thomas Falcon <tlfalcon@...ux.vnet.ibm.com>
---
 drivers/net/ethernet/ibm/ibmvnic.c | 9 ++++++---
 1 file changed, 6 insertions(+), 3 deletions(-)

diff --git a/drivers/net/ethernet/ibm/ibmvnic.c b/drivers/net/ethernet/ibm/ibmvnic.c
index 5378b21..ba4c79d 100644
--- a/drivers/net/ethernet/ibm/ibmvnic.c
+++ b/drivers/net/ethernet/ibm/ibmvnic.c
@@ -1504,9 +1504,6 @@ static int ibmvnic_poll(struct napi_struct *napi, int budget)
 	int scrq_num = (int)(napi - adapter->napi);
 	int frames_processed = 0;
 
-	if (adapter->resetting)
-		return 0;
-
 restart_poll:
 	while (frames_processed < budget) {
 		struct sk_buff *skb;
@@ -1516,6 +1513,12 @@ static int ibmvnic_poll(struct napi_struct *napi, int budget)
 		u16 offset;
 		u8 flags = 0;
 
+		if (unlikely(adapter->resetting)) {
+			enable_scrq_irq(adapter, adapter->rx_scrq[scrq_num]);
+			napi_complete_done(napi, frames_processed);
+			return frames_processed;
+		}
+
 		if (!pending_scrq(adapter, adapter->rx_scrq[scrq_num]))
 			break;
 		next = ibmvnic_next_scrq(adapter, adapter->rx_scrq[scrq_num]);
-- 
1.8.5.6