From 901d3fe848d8c34988699592c9f4b98c2ce10a8b Mon Sep 17 00:00:00 2001 From: Steve Hodgson Date: Tue, 1 Jun 2010 11:18:28 +0000 Subject: [PATCH] sfc: Wait for the link to stay up before running loopback selftest It's been observed that some phys (such as the qt2025c) can do down-up-down-up transitions, presumably as pcs block lock settles down. The loopback selftest will start sending data immediately after the link comes up. Work around this by waiting for the link state to stay up for two consecutive polls, rather than one. Signed-off-by: Ben Hutchings Signed-off-by: David S. Miller --- drivers/net/sfc/selftest.c | 10 +++++++--- 1 file changed, 7 insertions(+), 3 deletions(-) diff --git a/drivers/net/sfc/selftest.c b/drivers/net/sfc/selftest.c index 371e86cc090f..52ac14af83a4 100644 --- a/drivers/net/sfc/selftest.c +++ b/drivers/net/sfc/selftest.c @@ -545,7 +545,7 @@ efx_test_loopback(struct efx_tx_queue *tx_queue, static int efx_wait_for_link(struct efx_nic *efx) { struct efx_link_state *link_state = &efx->link_state; - int count; + int count, link_up_count = 0; bool link_up; for (count = 0; count < 40; count++) { @@ -567,8 +567,12 @@ static int efx_wait_for_link(struct efx_nic *efx) link_up = !efx->mac_op->check_fault(efx); mutex_unlock(&efx->mac_lock); - if (link_up) - return 0; + if (link_up) { + if (++link_up_count == 2) + return 0; + } else { + link_up_count = 0; + } } return -ETIMEDOUT; -- 2.20.1