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Subject[PATCH 3.16 75/87] be2net: fix link failure after ethtool offline test
3.16.75-rc1 review patch.  If anyone has any objections, please let me know.

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

From: Petr Oros <poros@redhat.com>

commit 2e5db6eb3c23e5dc8171eb8f6af7a97ef9fcf3a9 upstream.

Certain cards in conjunction with certain switches need a little more
time for link setup that results in ethtool link test failure after
offline test. Patch adds a loop that waits for a link setup finish.

Changes in v2:
- added fixes header

Fixes: 4276e47e2d1c ("be2net: Add link test to list of ethtool self tests.")
Signed-off-by: Petr Oros <poros@redhat.com>
Reviewed-by: Ivan Vecera <ivecera@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
---
.../net/ethernet/emulex/benet/be_ethtool.c | 28 +++++++++++++++----
1 file changed, 22 insertions(+), 6 deletions(-)

--- a/drivers/net/ethernet/emulex/benet/be_ethtool.c
+++ b/drivers/net/ethernet/emulex/benet/be_ethtool.c
@@ -779,7 +779,7 @@ static void be_self_test(struct net_devi
u64 *data)
{
struct be_adapter *adapter = netdev_priv(netdev);
- int status;
+ int status, cnt;
u8 link_status = 0;

if (adapter->function_caps & BE_FUNCTION_CAPS_SUPER_NIC) {
@@ -790,6 +790,9 @@ static void be_self_test(struct net_devi

memset(data, 0, sizeof(u64) * ETHTOOL_TESTS_NUM);

+ /* check link status before offline tests */
+ link_status = netif_carrier_ok(netdev);
+
if (test->flags & ETH_TEST_FL_OFFLINE) {
if (be_loopback_test(adapter, BE_MAC_LOOPBACK, &data[0]) != 0)
test->flags |= ETH_TEST_FL_FAILED;
@@ -810,13 +813,26 @@ static void be_self_test(struct net_devi
test->flags |= ETH_TEST_FL_FAILED;
}

- status = be_cmd_link_status_query(adapter, NULL, &link_status, 0);
- if (status) {
- test->flags |= ETH_TEST_FL_FAILED;
- data[4] = -1;
- } else if (!link_status) {
+ /* link status was down prior to test */
+ if (!link_status) {
test->flags |= ETH_TEST_FL_FAILED;
data[4] = 1;
+ return;
+ }
+
+ for (cnt = 10; cnt; cnt--) {
+ status = be_cmd_link_status_query(adapter, NULL, &link_status,
+ 0);
+ if (status) {
+ test->flags |= ETH_TEST_FL_FAILED;
+ data[4] = -1;
+ break;
+ }
+
+ if (link_status)
+ break;
+
+ msleep_interruptible(500);
}
}

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