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(p200300ea8f318700e1176b0372ecd890.dip0.t-ipconnect.de. [2003:ea:8f31:8700:e117:6b03:72ec:d890]) by smtp.gmail.com with ESMTPSA id ffacd0b85a97d-43b3e9a4fcdsm21982305f8f.8.2026.03.17.02.44.30 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Tue, 17 Mar 2026 02:44:31 -0700 (PDT) Message-ID: <7e39eb0e-d4eb-451f-bdb2-206ddd0a0b35@gmail.com> Date: Tue, 17 Mar 2026 10:44:30 +0100 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH next v1] r8169: Fix PHY lookup for mdiobus_get_phy() and improve error reporting during probe To: Anand Moon Cc: "maintainer:8169 10/100/1000 GIGABIT ETHERNET DRIVER" , Andrew Lunn , "David S. Miller" , Eric Dumazet , Jakub Kicinski , Paolo Abeni , Manivannan Sadhasivam , Shawn Lin , Hans Zhang <18255117159@163.com>, Niklas Cassel , "open list:8169 10/100/1000 GIGABIT ETHERNET DRIVER" , open list , Robin Murphy , Danilo Krummrich References: <20260317061700.7734-1-linux.amoon@gmail.com> Content-Language: en-US From: Heiner Kallweit In-Reply-To: Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit On 17.03.2026 08:59, Anand Moon wrote: > Hi Heiner, > > Thanks for your review comments. > > On Tue, 17 Mar 2026 at 12:21, Heiner Kallweit wrote: >> >> On 17.03.2026 07:16, Anand Moon wrote: >>> The driver currently assumes the PHY is always at address 0. On some >>> hardware or buggy BIOS implementations, the PHY may reside at a >>> different address on the MDIO bus. Update r8169_mdio_register() >>> to scan the bus for the first available PHY instead of hardcoding >>> address 0. >> >> No. The PHY always shows up at (virtual) address 0, due to the >> MAC register based way of accessing the internal PHY. >> Do you have any concrete example of such a "hardware or buggy bios"? >> > Sorry about that, I didn't realize. Unfortunately, my testing shows > this still doesn't > fix the problem, but I still perceive. I modeled the change after some > other drivers, > but clearly, that approach isn't working in this case. >>> >>> Additionally, switch to dev_err_probe() in the main probe path to >>> provide standardized error handling and cleaner log output for >>> registration failures. >>> >>> Link: https://lore.kernel.org/all/87bc37ee-234c-4568-b72e-955c130a6838@arm.com/ >>> Fixes: ec392abc9593 ("PCI: dw-rockchip: Enable async probe by default") >>> Cc: Robin Murphy >>> Cc: Danilo Krummrich >>> Cc: Niklas Cassel >>> Signed-off-by: Anand Moon >>> --- >>> drivers/net/ethernet/realtek/r8169_main.c | 34 ++++++++++++++++------- >>> 1 file changed, 24 insertions(+), 10 deletions(-) >>> >>> diff --git a/drivers/net/ethernet/realtek/r8169_main.c b/drivers/net/ethernet/realtek/r8169_main.c >>> index 791277e750ba..0fd735beff92 100644 >>> --- a/drivers/net/ethernet/realtek/r8169_main.c >>> +++ b/drivers/net/ethernet/realtek/r8169_main.c >>> @@ -5427,7 +5427,8 @@ static int r8169_mdio_register(struct rtl8169_private *tp) >>> { >>> struct pci_dev *pdev = tp->pci_dev; >>> struct mii_bus *new_bus; >>> - int ret; >>> + struct phy_device *phydev; >>> + int ret, addr; >>> >>> /* On some boards with this chip version the BIOS is buggy and misses >>> * to reset the PHY page selector. This results in the PHY ID read >>> @@ -5462,18 +5463,31 @@ static int r8169_mdio_register(struct rtl8169_private *tp) >>> if (ret) >>> return ret; >>> >>> - tp->phydev = mdiobus_get_phy(new_bus, 0); >>> - if (!tp->phydev) { >>> + /* find the first (lowest address) PHY on the current MAC's MII bus */ >>> + for (addr = 0; addr < PHY_MAX_ADDR; addr++) { >>> + struct phy_device *tmp = mdiobus_get_phy(new_bus, addr); >>> + >>> + if (tmp) { >>> + phydev = tmp; >>> + break; >>> + } >>> + } >>> + >>> + if (!phydev) { >>> + dev_err(&pdev->dev, "no PHY found on bus\n"); >>> return -ENODEV; >>> - } else if (!tp->phydev->drv) { >>> - /* Most chip versions fail with the genphy driver. >>> - * Therefore ensure that the dedicated PHY driver is loaded. >>> - */ >> >> This check is needed. It's seems your actual intention is something completely >> different from what you state in the commit message. You try to find a workaround >> for the issues with request_module() from async contect, caused by the referenced >> change to Rockchip PCI. > That makes sense, sorry for the noise. > > What are your thoughts on using dev_err_probe() for these registration failures? > I thought it might clean up the error path. > I'm not aware of any realistic scenario where these calls would fail (w/o printing an error message before). So adding an error message wouldn't hurt, but it also wouldn't be beneficial enough to justify a patch. > Thanks > -Anand >> >>> + } >>> + >>> + /* Most chip versions fail with the genphy driver. >>> + * Therefore ensure that the dedicated PHY driver is loaded. >>> + */ >>> + if (!phydev->drv) { >>> dev_err(&pdev->dev, "no dedicated PHY driver found for PHY ID 0x%08x, maybe realtek.ko needs to be added to initramfs?\n", >>> - tp->phydev->phy_id); >>> + phydev->phy_id); >>> return -EUNATCH; >>> } >>> >>> + tp->phydev = phydev; >>> tp->phydev->mac_managed_pm = true; >>> if (rtl_supports_eee(tp)) >>> phy_support_eee(tp->phydev); >>> @@ -5790,11 +5804,11 @@ static int rtl_init_one(struct pci_dev *pdev, const struct pci_device_id *ent) >>> >>> rc = r8169_mdio_register(tp); >>> if (rc) >>> - return rc; >>> + return dev_err_probe(&pdev->dev, rc, "mdio register failure\n"); >>> >>> rc = register_netdev(dev); >>> if (rc) >>> - return rc; >>> + return dev_err_probe(&pdev->dev, rc, "register newdev failure\n"); >>> >>> if (IS_ENABLED(CONFIG_R8169_LEDS)) { >>> if (rtl_is_8125(tp)) >>> >>> base-commit: 95c541ddfb0815a0ea8477af778bb13bb075079a >>