This is a note to let you know that I've just added the patch titled
r8169: fix rare issue with broken rx after link-down on RTL8125
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:
r8169-fix-rare-issue-with-broken-rx-after-link-down-.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 9fa06c0e8bfa31ac60ee8edb31ec9ad07818f456
Author: Heiner Kallweit <hkallweit1@xxxxxxxxx>
Date: Thu Oct 12 08:51:13 2023 +0200
r8169: fix rare issue with broken rx after link-down on RTL8125
[ Upstream commit 621735f590643e3048ca2060c285b80551660601 ]
In very rare cases (I've seen two reports so far about different
RTL8125 chip versions) it seems the MAC locks up when link goes down
and requires a software reset to get revived.
Realtek doesn't publish hw errata information, therefore the root cause
is unknown. Realtek vendor drivers do a full hw re-initialization on
each link-up event, the slimmed-down variant here was reported to fix
the issue for the reporting user.
It's not fully clear which parts of the NIC are reset as part of the
software reset, therefore I can't rule out side effects.
Fixes: f1bce4ad2f1c ("r8169: add support for RTL8125")
Reported-by: Martin Kjær Jørgensen <me@xxxxxxxx>
Link: https://lore.kernel.org/netdev/97ec2232-3257-316c-c3e7-a08192ce16a6@xxxxxxxxx/T/
Signed-off-by: Heiner Kallweit <hkallweit1@xxxxxxxxx>
Link: https://lore.kernel.org/r/9edde757-9c3b-4730-be3b-0ef3a374ff71@xxxxxxxxx
Signed-off-by: Jakub Kicinski <kuba@xxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
diff --git a/drivers/net/ethernet/realtek/r8169_main.c b/drivers/net/ethernet/realtek/r8169_main.c
index 73bbcb72cf3f0..ab84c623a7c62 100644
--- a/drivers/net/ethernet/realtek/r8169_main.c
+++ b/drivers/net/ethernet/realtek/r8169_main.c
@@ -4661,7 +4661,11 @@ static void r8169_phylink_handler(struct net_device *ndev)
if (netif_carrier_ok(ndev)) {
rtl_link_chg_patch(tp);
pm_request_resume(d);
+ netif_wake_queue(tp->dev);
} else {
+ /* In few cases rx is broken after link-down otherwise */
+ if (rtl_is_8125(tp))
+ rtl_reset_work(tp);
pm_runtime_idle(d);
}
