From: Heiner Kallweit hkallweit1@gmail.com
stable inclusion from stable-v6.6.2 commit 0fbeb803ef02a0ec2ed8c7d57cfa6fe264cdc09a category: bugfix bugzilla: https://gitee.com/openeuler/kernel/issues/I8IW7G
Reference: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=...
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[ 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@lagy.org Link: https://lore.kernel.org/netdev/97ec2232-3257-316c-c3e7-a08192ce16a6@gmail.co... Signed-off-by: Heiner Kallweit hkallweit1@gmail.com Link: https://lore.kernel.org/r/9edde757-9c3b-4730-be3b-0ef3a374ff71@gmail.com Signed-off-by: Jakub Kicinski kuba@kernel.org Signed-off-by: Sasha Levin sashal@kernel.org Signed-off-by: Zheng Zengkai zhengzengkai@huawei.com --- drivers/net/ethernet/realtek/r8169_main.c | 4 ++++ 1 file changed, 4 insertions(+)
diff --git a/drivers/net/ethernet/realtek/r8169_main.c b/drivers/net/ethernet/realtek/r8169_main.c index 361b90007148..a987defb575c 100644 --- a/drivers/net/ethernet/realtek/r8169_main.c +++ b/drivers/net/ethernet/realtek/r8169_main.c @@ -4596,7 +4596,11 @@ 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); }