This is a note to let you know that I've just added the patch titled
s390/qeth: Don't call dev_close/dev_open (DOWN/UP)
to the 5.15-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
s390-qeth-don-t-call-dev_close-dev_open-down-up.patch
and it can be found in the queue-5.15 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit eef58eb8d42cde6fba85860085f12a18ac9a11b5
Author: Alexandra Winter <wintera@xxxxxxxxxxxxx>
Date: Tue Aug 1 10:00:16 2023 +0200
s390/qeth: Don't call dev_close/dev_open (DOWN/UP)
[ 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@xxxxxxxxxxxxx>
Reviewed-by: Wenjia Zhang <wenjia@xxxxxxxxxxxxx>
Signed-off-by: David S. Miller <davem@xxxxxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
diff --git a/drivers/s390/net/qeth_core.h b/drivers/s390/net/qeth_core.h
index a5aa0bdc61d69..e8c360879883b 100644
--- a/drivers/s390/net/qeth_core.h
+++ b/drivers/s390/net/qeth_core.h
@@ -717,7 +717,6 @@ 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 e9807d2996a9d..62e7576bff536 100644
--- a/drivers/s390/net/qeth_core_main.c
+++ b/drivers/s390/net/qeth_core_main.c
@@ -5459,8 +5459,6 @@ 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 d694e3ff80865..7cdf3274cf964 100644
--- a/drivers/s390/net/qeth_l2_main.c
+++ b/drivers/s390/net/qeth_l2_main.c
@@ -2373,9 +2373,12 @@ 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 6fd3e288f0595..93f55c7348026 100644
--- a/drivers/s390/net/qeth_l3_main.c
+++ b/drivers/s390/net/qeth_l3_main.c
@@ -2029,9 +2029,11 @@ 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();
}
