From: Heiner Kallweit Date: Thu, 12 Oct 2023 06:51:13 +0000 (+0200) Subject: r8169: fix rare issue with broken rx after link-down on RTL8125 X-Git-Tag: v6.7-rc1~160^2~142 X-Git-Url: https://repo.jachan.dev/linux.git/commitdiff_plain/621735f59064 r8169: fix rare issue with broken rx after link-down on RTL8125 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 Link: https://lore.kernel.org/netdev/97ec2232-3257-316c-c3e7-a08192ce16a6@gmail.com/T/ Signed-off-by: Heiner Kallweit Link: https://lore.kernel.org/r/9edde757-9c3b-4730-be3b-0ef3a374ff71@gmail.com Signed-off-by: Jakub Kicinski --- diff --git a/drivers/net/ethernet/realtek/r8169_main.c b/drivers/net/ethernet/realtek/r8169_main.c index 6351a2dc13bc..df0df4d09f05 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); }