linux-kernel - [PATCH 4.9 23/32] ibmveth: Do not process frames after calling napi

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Message-Id: <20190304081603.972053420@linuxfoundation.org>
Date:   Mon,  4 Mar 2019 09:22:11 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Thomas Falcon <tlfalcon@...ux.ibm.com>,
        "David S. Miller" <davem@...emloft.net>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH 4.9 23/32] ibmveth: Do not process frames after calling napi_reschedule

4.9-stable review patch.  If anyone has any objections, please let me know.

------------------

[ Upstream commit e95d22c69b2c130ccce257b84daf283fd82d611e ]

The IBM virtual ethernet driver's polling function continues
to process frames after rescheduling NAPI, resulting in a warning
if it exhausted its budget. Do not restart polling after calling
napi_reschedule. Instead let frames be processed in the following
instance.

Signed-off-by: Thomas Falcon <tlfalcon@...ux.ibm.com>
Signed-off-by: David S. Miller <davem@...emloft.net>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/net/ethernet/ibm/ibmveth.c | 2 --
 1 file changed, 2 deletions(-)

diff --git a/drivers/net/ethernet/ibm/ibmveth.c b/drivers/net/ethernet/ibm/ibmveth.c
index 4996228fd7e61..955f658f3b65f 100644
--- a/drivers/net/ethernet/ibm/ibmveth.c
+++ b/drivers/net/ethernet/ibm/ibmveth.c
@@ -1240,7 +1240,6 @@ static int ibmveth_poll(struct napi_struct *napi, int budget)
 	struct iphdr *iph;
 	u16 mss = 0;
 
-restart_poll:
 	while (frames_processed < budget) {
 		if (!ibmveth_rxq_pending_buffer(adapter))
 			break;
@@ -1338,7 +1337,6 @@ static int ibmveth_poll(struct napi_struct *napi, int budget)
 		    napi_reschedule(napi)) {
 			lpar_rc = h_vio_signal(adapter->vdev->unit_address,
 					       VIO_IRQ_DISABLE);
-			goto restart_poll;
 		}
 	}
 
-- 
2.19.1