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([2001:9e8:f104:6501:10da:a6ca:b9c4:f578]) by smtp.gmail.com with ESMTPSA id ffacd0b85a97d-45ee5a84e92sm6664031f8f.35.2026.05.28.12.15.43 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Thu, 28 May 2026 12:15:44 -0700 (PDT) Message-ID: Date: Thu, 28 May 2026 21:15:43 +0200 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird To: devnull+corey.leavitt.info@kernel.org Cc: andrew+netdev@lunn.ch, andrew@lunn.ch, corey@leavitt.info, davem@davemloft.net, edumazet@google.com, hkallweit1@gmail.com, kory.maincent@bootlin.com, kuba@kernel.org, linux-kernel@vger.kernel.org, linux@armlinux.org.uk, netdev@vger.kernel.org, o.rempel@pengutronix.de, pabeni@redhat.com References: <20260423-pse-notifier-decouple-v1-4-86ed750a9d62@leavitt.info> Subject: Re: [PATCH RFC net-next 4/4] net: phy: own phydev->psec via PSE notifier and remove fwnode_mdio hook Content-Language: en-US From: Jonas Jelonek In-Reply-To: <20260423-pse-notifier-decouple-v1-4-86ed750a9d62@leavitt.info> Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Hi, this patch seems to cause a deadlock with PHYs which provide SFP  ports. Noticed this downstream in OpenWrt with Realtek RTL8214FC using an extension to the upstream driver [1]. I suspect the deadlock happens because phy_device_register takes rtnl_lock with this patch. But further down in the call chain, phy_sfp_probe is called, calling sfp_bus_add_upstream which in turn tries to take rtnl_lock again. While the downstream driver part still calls phy_sfp_probe itself, backporting the phy_port changes to 6.18 and adjusting the driver doesn't help. If I got it correctly, the phy_sfp_probe just moves into phylib core but still causes the deadlock. Kind regards, Jonas Jelonek [1] https://git.openwrt.org/openwrt/openwrt/tree/target/linux/realtek/files-6.18/drivers/net/phy/realtek/realtek_multiport.c