From: Sasha Levin <sashal@kernel.org>
To: linux-kernel@vger.kernel.org, stable@vger.kernel.org
Cc: Valentin Longchamp <valentin@longchamp.me>,
Matteo Ghidoni <matteo.ghidoni@ch.abb.com>,
"David S . Miller" <davem@davemloft.net>,
Sasha Levin <sashal@kernel.org>,
netdev@vger.kernel.org, linuxppc-dev@lists.ozlabs.org
Subject: [PATCH AUTOSEL 5.4 15/26] net/ethernet/freescale: rework quiesce/activate for ucc_geth
Date: Thu, 28 May 2020 07:56:43 -0400 [thread overview]
Message-ID: <20200528115654.1406165-15-sashal@kernel.org> (raw)
In-Reply-To: <20200528115654.1406165-1-sashal@kernel.org>
From: Valentin Longchamp <valentin@longchamp.me>
[ Upstream commit 79dde73cf9bcf1dd317a2667f78b758e9fe139ed ]
ugeth_quiesce/activate are used to halt the controller when there is a
link change that requires to reconfigure the mac.
The previous implementation called netif_device_detach(). This however
causes the initial activation of the netdevice to fail precisely because
it's detached. For details, see [1].
A possible workaround was the revert of commit
net: linkwatch: add check for netdevice being present to linkwatch_do_dev
However, the check introduced in the above commit is correct and shall be
kept.
The netif_device_detach() is thus replaced with
netif_tx_stop_all_queues() that prevents any tranmission. This allows to
perform mac config change required by the link change, without detaching
the corresponding netdevice and thus not preventing its initial
activation.
[1] https://lists.openwall.net/netdev/2020/01/08/201
Signed-off-by: Valentin Longchamp <valentin@longchamp.me>
Acked-by: Matteo Ghidoni <matteo.ghidoni@ch.abb.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
drivers/net/ethernet/freescale/ucc_geth.c | 13 +++++++------
1 file changed, 7 insertions(+), 6 deletions(-)
diff --git a/drivers/net/ethernet/freescale/ucc_geth.c b/drivers/net/ethernet/freescale/ucc_geth.c
index f839fa94ebdd..d3b8ce734c1b 100644
--- a/drivers/net/ethernet/freescale/ucc_geth.c
+++ b/drivers/net/ethernet/freescale/ucc_geth.c
@@ -42,6 +42,7 @@
#include <soc/fsl/qe/ucc.h>
#include <soc/fsl/qe/ucc_fast.h>
#include <asm/machdep.h>
+#include <net/sch_generic.h>
#include "ucc_geth.h"
@@ -1548,11 +1549,8 @@ static int ugeth_disable(struct ucc_geth_private *ugeth, enum comm_dir mode)
static void ugeth_quiesce(struct ucc_geth_private *ugeth)
{
- /* Prevent any further xmits, plus detach the device. */
- netif_device_detach(ugeth->ndev);
-
- /* Wait for any current xmits to finish. */
- netif_tx_disable(ugeth->ndev);
+ /* Prevent any further xmits */
+ netif_tx_stop_all_queues(ugeth->ndev);
/* Disable the interrupt to avoid NAPI rescheduling. */
disable_irq(ugeth->ug_info->uf_info.irq);
@@ -1565,7 +1563,10 @@ static void ugeth_activate(struct ucc_geth_private *ugeth)
{
napi_enable(&ugeth->napi);
enable_irq(ugeth->ug_info->uf_info.irq);
- netif_device_attach(ugeth->ndev);
+
+ /* allow to xmit again */
+ netif_tx_wake_all_queues(ugeth->ndev);
+ __netdev_watchdog_up(ugeth->ndev);
}
/* Called every time the controller might need to be made
--
2.25.1
next prev parent reply other threads:[~2020-05-28 11:58 UTC|newest]
Thread overview: 27+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-05-28 11:56 [PATCH AUTOSEL 5.4 01/26] ARC: Fix ICCM & DCCM runtime size checks Sasha Levin
2020-05-28 11:56 ` [PATCH AUTOSEL 5.4 02/26] ARC: [plat-eznps]: Restrict to CONFIG_ISA_ARCOMPACT Sasha Levin
2020-05-28 11:56 ` [PATCH AUTOSEL 5.4 03/26] evm: Fix RCU list related warnings Sasha Levin
2020-05-28 11:56 ` [PATCH AUTOSEL 5.4 04/26] scsi: pm: Balance pm_only counter of request queue during system resume Sasha Levin
2020-05-28 11:56 ` [PATCH AUTOSEL 5.4 05/26] i2c: altera: Fix race between xfer_msg and isr thread Sasha Levin
2020-05-28 11:56 ` [PATCH AUTOSEL 5.4 06/26] io_uring: initialize ctx->sqo_wait earlier Sasha Levin
2020-05-28 11:56 ` [PATCH AUTOSEL 5.4 07/26] net sched: fix reporting the first-time use timestamp Sasha Levin
2020-05-31 21:19 ` Pavel Machek
2020-05-28 11:56 ` [PATCH AUTOSEL 5.4 08/26] x86/mmiotrace: Use cpumask_available() for cpumask_var_t variables Sasha Levin
2020-05-28 11:56 ` [PATCH AUTOSEL 5.4 09/26] net: bmac: Fix read of MAC address from ROM Sasha Levin
2020-05-28 11:56 ` [PATCH AUTOSEL 5.4 10/26] r8152: support additional Microsoft Surface Ethernet Adapter variant Sasha Levin
2020-05-28 11:56 ` [PATCH AUTOSEL 5.4 11/26] drm/edid: Add Oculus Rift S to non-desktop list Sasha Levin
2020-05-28 11:56 ` [PATCH AUTOSEL 5.4 12/26] s390/mm: fix set_huge_pte_at() for empty ptes Sasha Levin
2020-05-28 11:56 ` [PATCH AUTOSEL 5.4 13/26] null_blk: return error for invalid zone size Sasha Levin
2020-05-28 11:56 ` [PATCH AUTOSEL 5.4 14/26] net: mvpp2: fix RX hashing for non-10G ports Sasha Levin
2020-05-28 11:56 ` Sasha Levin [this message]
2020-05-28 11:56 ` [PATCH AUTOSEL 5.4 16/26] net: ethernet: stmmac: Enable interface clocks on probe for IPQ806x Sasha Levin
2020-05-28 11:56 ` [PATCH AUTOSEL 5.4 17/26] selftests: mlxsw: qos_mc_aware: Specify arping timeout as an integer Sasha Levin
2020-05-28 11:56 ` [PATCH AUTOSEL 5.4 18/26] net: sun: fix missing release regions in cas_init_one() Sasha Levin
2020-05-28 11:56 ` [PATCH AUTOSEL 5.4 19/26] net/mlx5: Add command entry handling completion Sasha Levin
2020-05-28 11:56 ` [PATCH AUTOSEL 5.4 20/26] net/mlx5e: Fix inner tirs handling Sasha Levin
2020-05-28 11:56 ` [PATCH AUTOSEL 5.4 21/26] net/mlx5: Fix memory leak in mlx5_events_init Sasha Levin
2020-05-28 11:56 ` [PATCH AUTOSEL 5.4 22/26] net/mlx5e: Update netdev txq on completions during closure Sasha Levin
2020-05-28 11:56 ` [PATCH AUTOSEL 5.4 23/26] net/mlx5: Fix error flow in case of function_setup failure Sasha Levin
2020-05-28 11:56 ` [PATCH AUTOSEL 5.4 24/26] net: ethernet: ti: cpsw: fix ASSERT_RTNL() warning during suspend Sasha Levin
2020-05-28 11:56 ` [PATCH AUTOSEL 5.4 25/26] net/mlx4_core: fix a memory leak bug Sasha Levin
2020-05-28 11:56 ` [PATCH AUTOSEL 5.4 26/26] net: smsc911x: Fix runtime PM imbalance on error Sasha Levin
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