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[PATCH 4.2.y-ckt 32/53] net: fec: only clear a queue's work bit if the queue was emptied

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4.2.8-ckt11 -stable review patch.  If anyone has any objections, please let me know.

---8<------------------------------------------------------------

From: =?UTF-8?q?Uwe=20Kleine-K=C3=B6nig?= <u.kleine-koenig@pengutronix.de>

commit 1c021bb717a70aaeaa4b25c91f43c2aeddd922de upstream.

In the receive path a queue's work bit was cleared unconditionally even
if fec_enet_rx_queue only read out a part of the available packets from
the hardware. This resulted in not reading any packets in the next napi
turn and so packets were delayed or lost.

The obvious fix is to only clear a queue's bit when the queue was
emptied.

Fixes: 4d494cdc92b3 ("net: fec: change data structure to support multiqueue")
Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
Reviewed-by: Lucas Stach <l.stach@pengutronix.de>
Tested-by: Fugang Duan <fugang.duan@nxp.com>
Acked-by: Fugang Duan <fugang.duan@nxp.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Kamal Mostafa <kamal@canonical.com>
---
 drivers/net/ethernet/freescale/fec_main.c | 10 ++++++++--
 1 file changed, 8 insertions(+), 2 deletions(-)

diff --git a/drivers/net/ethernet/freescale/fec_main.c b/drivers/net/ethernet/freescale/fec_main.c
index 5d1dde3..6587e2e 100644
--- a/drivers/net/ethernet/freescale/fec_main.c
+++ b/drivers/net/ethernet/freescale/fec_main.c
@@ -1552,9 +1552,15 @@ fec_enet_rx(struct net_device *ndev, int budget)
 	struct fec_enet_private *fep = netdev_priv(ndev);
 
 	for_each_set_bit(queue_id, &fep->work_rx, FEC_ENET_MAX_RX_QS) {
-		clear_bit(queue_id, &fep->work_rx);
-		pkt_received += fec_enet_rx_queue(ndev,
+		int ret;
+
+		ret = fec_enet_rx_queue(ndev,
 					budget - pkt_received, queue_id);
+
+		if (ret < budget - pkt_received)
+			clear_bit(queue_id, &fep->work_rx);
+
+		pkt_received += ret;
 	}
 	return pkt_received;
 }
-- 
2.7.4

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[4.2.y-ckt stable] Linux 4.2.8-ckt11 stable review Kamal Mostafa <kamal@canonical.com> - 2016-05-24 20:00 +0200
  [PATCH 4.2.y-ckt 19/53] ALSA: usb-audio: Yet another Phoneix Audio device quirk Kamal Mostafa <kamal@canonical.com> - 2016-05-24 20:00 +0200
  [PATCH 4.2.y-ckt 32/53] net: fec: only clear a queue's work bit if the queue was emptied Kamal Mostafa <kamal@canonical.com> - 2016-05-24 20:10 +0200
  [PATCH 4.2.y-ckt 27/53] macvtap: segmented packet is consumed Kamal Mostafa <kamal@canonical.com> - 2016-05-24 20:10 +0200
  [PATCH 4.2.y-ckt 42/53] net_sched: update hierarchical backlog too Kamal Mostafa <kamal@canonical.com> - 2016-05-24 20:10 +0200
  [PATCH 4.2.y-ckt 30/53] bridge: fix igmp / mld query parsing Kamal Mostafa <kamal@canonical.com> - 2016-05-24 20:10 +0200
  [PATCH 4.2.y-ckt 24/53] workqueue: fix rebind bound workers warning Kamal Mostafa <kamal@canonical.com> - 2016-05-24 20:10 +0200
  [PATCH 4.2.y-ckt 25/53] ocfs2: fix posix_acl_create deadlock Kamal Mostafa <kamal@canonical.com> - 2016-05-24 20:10 +0200
  [PATCH 4.2.y-ckt 39/53] ipv4/fib: don't warn when primary address is missing if in_dev is dead Kamal Mostafa <kamal@canonical.com> - 2016-05-24 20:10 +0200
  [PATCH 4.2.y-ckt 35/53] decnet: Do not build routes to devices without decnet private data. Kamal Mostafa <kamal@canonical.com> - 2016-05-24 20:10 +0200
  [PATCH 4.2.y-ckt 46/53] net: fix infoleak in llc Kamal Mostafa <kamal@canonical.com> - 2016-05-24 20:10 +0200
  [PATCH 4.2.y-ckt 37/53] net: use skb_postpush_rcsum instead of own implementations Kamal Mostafa <kamal@canonical.com> - 2016-05-24 20:10 +0200
  [PATCH 4.2.y-ckt 34/53] net/route: enforce hoplimit max value Kamal Mostafa <kamal@canonical.com> - 2016-05-24 20:10 +0200
  [PATCH 4.2.y-ckt 16/53] ALSA: hda - Fix subwoofer pin on ASUS N751 and N551 Kamal Mostafa <kamal@canonical.com> - 2016-05-24 20:10 +0200
  [PATCH 4.2.y-ckt 31/53] net/mlx4_en: Fix endianness bug in IPV6 csum calculation Kamal Mostafa <kamal@canonical.com> - 2016-05-24 20:10 +0200
  [PATCH 4.2.y-ckt 36/53] route: do not cache fib route info on local routes with oif Kamal Mostafa <kamal@canonical.com> - 2016-05-24 20:10 +0200
  [PATCH 4.2.y-ckt 43/53] sch_htb: update backlog as well Kamal Mostafa <kamal@canonical.com> - 2016-05-24 20:10 +0200
  [PATCH 4.2.y-ckt 14/53] drm/i915: Bail out of pipe config compute loop on LPT Kamal Mostafa <kamal@canonical.com> - 2016-05-24 20:10 +0200
  [PATCH 4.2.y-ckt 15/53] ALSA: hda - Fix broken reconfig Kamal Mostafa <kamal@canonical.com> - 2016-05-24 20:10 +0200
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  [PATCH 4.2.y-ckt 28/53] regulator: axp20x: Fix axp22x ldo_io voltage ranges Kamal Mostafa <kamal@canonical.com> - 2016-05-24 20:10 +0200
  [PATCH 4.2.y-ckt 38/53] vlan: pull on __vlan_insert_tag error path and fix csum correction Kamal Mostafa <kamal@canonical.com> - 2016-05-24 20:10 +0200
  [PATCH 4.2.y-ckt 29/53] arm64: bpf: jit JMP_JSET_{X,K} Kamal Mostafa <kamal@canonical.com> - 2016-05-24 20:10 +0200
  [PATCH 4.2.y-ckt 17/53] vfs: add vfs_select_inode() helper Kamal Mostafa <kamal@canonical.com> - 2016-05-24 20:10 +0200
  [PATCH 4.2.y-ckt 41/53] net_sched: introduce qdisc_replace() helper Kamal Mostafa <kamal@canonical.com> - 2016-05-24 20:10 +0200
  [PATCH 4.2.y-ckt 18/53] vfs: rename: check backing inode being equal Kamal Mostafa <kamal@canonical.com> - 2016-05-24 20:10 +0200
  [PATCH 4.2.y-ckt 12/53] ALSA: hda - Fix white noise on Asus UX501VW headset Kamal Mostafa <kamal@canonical.com> - 2016-05-24 20:20 +0200
  [PATCH 4.2.y-ckt 08/53] crypto: hash - Fix page length clamping in hash walk Kamal Mostafa <kamal@canonical.com> - 2016-05-24 20:20 +0200
  [PATCH 4.2.y-ckt 02/53] Revert "usb: hub: do not clear BOS field during reset device" Kamal Mostafa <kamal@canonical.com> - 2016-05-24 20:20 +0200
  [PATCH 4.2.y-ckt 07/53] drm/i915/bdw: Add missing delay during L3 SQC credit programming Kamal Mostafa <kamal@canonical.com> - 2016-05-24 20:20 +0200
  [PATCH 4.2.y-ckt 10/53] drm/radeon: fix PLL sharing on DCE6.1 (v2) Kamal Mostafa <kamal@canonical.com> - 2016-05-24 20:20 +0200
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  [PATCH 4.2.y-ckt 13/53] Input: max8997-haptic - fix NULL pointer dereference Kamal Mostafa <kamal@canonical.com> - 2016-05-24 20:20 +0200
  [PATCH 4.2.y-ckt 11/53] get_rock_ridge_filename(): handle malformed NM entries Kamal Mostafa <kamal@canonical.com> - 2016-05-24 20:20 +0200
  [PATCH 4.2.y-ckt 03/53] regulator: s2mps11: Fix invalid selector mask and voltages for buck9 Kamal Mostafa <kamal@canonical.com> - 2016-05-24 20:20 +0200
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