[PATCH 6.1 058/127] s390/qeth: Dont call dev_close/dev_open (DOWN/UP)

Greg Kroah-Hartman
2023-08-09T10:53:55Z

From: Alexandra Winter <wintera@linux.ibm.com>

[ Upstream commit 1cfef80d4c2b2c599189f36f36320b205d9447d9 ]

dev_close() and dev_open() are issued to change the interface state to DOWN
or UP (dev->flags IFF_UP). When the netdev is set DOWN it loses e.g its
Ipv6 addresses and routes. We don't want this in cases of device recovery
(triggered by hardware or software) or when the qeth device is set
offline.

Setting a qeth device offline or online and device recovery actions call
netif_device_detach() and/or netif_device_attach(). That will reset or
set the LOWER_UP indication i.e. change the dev->state Bit
__LINK_STATE_PRESENT. That is enough to e.g. cause bond failovers, and
still preserves the interface settings that are handled by the network
stack.

Don't call dev_open() nor dev_close() from the qeth device driver. Let the
network stack handle this.

Fixes: d4560150cb47 ("s390/qeth: call dev_close() during recovery")
Signed-off-by: Alexandra Winter <wintera@linux.ibm.com>
Reviewed-by: Wenjia Zhang <wenjia@linux.ibm.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
drivers/s390/net/qeth_core.h | 1 -
drivers/s390/net/qeth_core_main.c | 2 --
drivers/s390/net/qeth_l2_main.c | 9 ++++++---
drivers/s390/net/qeth_l3_main.c | 8 +++++---
4 files changed, 11 insertions(+), 9 deletions(-)

diff --git a/drivers/s390/net/qeth_core.h b/drivers/s390/net/qeth_core.h
index 1d195429753dd..613eab7297046 100644
--- a/drivers/s390/net/qeth_core.h
+++ b/drivers/s390/net/qeth_core.h
@@ -716,7 +716,6 @@ struct qeth_card_info {
u16 chid;
u8 ids_valid:1; /* cssid,iid,chid */
u8 dev_addr_is_registered:1;
- u8 open_when_online:1;
u8 promisc_mode:1;
u8 use_v1_blkt:1;
u8 is_vm_nic:1;
diff --git a/drivers/s390/net/qeth_core_main.c b/drivers/s390/net/qeth_core_main.c
index 8bd9fd51208c9..ae4b6d24bc902 100644
--- a/drivers/s390/net/qeth_core_main.c
+++ b/drivers/s390/net/qeth_core_main.c
@@ -5371,8 +5371,6 @@ int qeth_set_offline(struct qeth_card *card, const struct qeth_discipline *disc,
qeth_clear_ipacmd_list(card);

rtnl_lock();
- card->info.open_when_online = card->dev->flags & IFF_UP;
- dev_close(card->dev);
netif_device_detach(card->dev);
netif_carrier_off(card->dev);
rtnl_unlock();
diff --git a/drivers/s390/net/qeth_l2_main.c b/drivers/s390/net/qeth_l2_main.c
index c6ded3fdd715c..9ef2118fc7a2a 100644
--- a/drivers/s390/net/qeth_l2_main.c
+++ b/drivers/s390/net/qeth_l2_main.c
@@ -2387,9 +2387,12 @@ static int qeth_l2_set_online(struct qeth_card *card, bool carrier_ok)
qeth_enable_hw_features(dev);
qeth_l2_enable_brport_features(card);

- if (card->info.open_when_online) {
- card->info.open_when_online = 0;
- dev_open(dev, NULL);
+ if (netif_running(dev)) {
+ local_bh_disable();
+ napi_schedule(&card->napi);
+ /* kick-start the NAPI softirq: */
+ local_bh_enable();
+ qeth_l2_set_rx_mode(dev);
}
rtnl_unlock();
}
diff --git a/drivers/s390/net/qeth_l3_main.c b/drivers/s390/net/qeth_l3_main.c
index d8487a10cd555..c0f30cefec102 100644
--- a/drivers/s390/net/qeth_l3_main.c
+++ b/drivers/s390/net/qeth_l3_main.c
@@ -2017,9 +2017,11 @@ static int qeth_l3_set_online(struct qeth_card *card, bool carrier_ok)
netif_device_attach(dev);
qeth_enable_hw_features(dev);

- if (card->info.open_when_online) {
- card->info.open_when_online = 0;
- dev_open(dev, NULL);
+ if (netif_running(dev)) {
+ local_bh_disable();
+ napi_schedule(&card->napi);
+ /* kick-start the NAPI softirq: */
+ local_bh_enable();
}
rtnl_unlock();
}
--
2.40.1