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[93.34.92.103]) by smtp.googlemail.com with ESMTPSA id 5b1f17b1804b1-4bb56719391sm52858285e9.1.2026.11.14.02.44.42 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sat, 14 Nov 2026 02:44:44 -0800 (PST) From: Christian Marangi To: Maxime Chevallier , Andrew Lunn , "David S. Miller" , Eric Dumazet , Jakub Kicinski , Paolo Abeni , Rob Herring , Krzysztof Kozlowski , Conor Dooley , Simon Horman , Jonathan Corbet , Shuah Khan , Randy Dunlap , Christian Marangi , Lorenzo Bianconi , Heiner Kallweit , Russell King , Philipp Zabel , Nathan Chancellor , Nick Desaulniers , Bill Wendling , Justin Stitt , netdev@vger.kernel.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, linux-doc@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-mediatek@lists.infradead.org, llvm@lists.linux.dev Subject: [PATCH net-next v20 06/15] net: phylink: make phylink_validate state locked Date: Sat, 14 Nov 2026 11:43:45 +0100 Message-ID: <20261114104426.235620-7-ansuelsmth@gmail.com> X-Mailer: git-send-email 2.55.0 In-Reply-To: <20261114104426.235620-1-ansuelsmth@gmail.com> References: <20261114104426.235620-1-ansuelsmth@gmail.com> X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Post: List-Help: List-Subscribe: List-Unsubscribe: List-Owner: Precedence: list MIME-Version: 1.0 Content-Transfer-Encoding: 8bit In preparation for support for PCS release/late attach, rework the phylink_validate functions to be locked under the state mutex. With the introduction of a notifier that can be called concurrently while a phylink_create is called or an interface mode validation is being run, on recalculating the supported interface and capabilities, an inconsistency can be introduced with 2 validation run at the same time. To handle this, make the phylink_validate lock under the phylink state mutex, add lockless variant for phylink_validate_mask and phylink_validate and add lockdep check to make sure the mutex is held in the inner validate functions. Function that already run phylink_validate under state mutex, are updated to use the lockless variant. Signed-off-by: Christian Marangi --- drivers/net/phy/phylink.c | 53 ++++++++++++++++++++++++++++++++------- 1 file changed, 44 insertions(+), 9 deletions(-) diff --git a/drivers/net/phy/phylink.c b/drivers/net/phy/phylink.c index e2e0b313fd61..a7ec4feb950a 100644 --- a/drivers/net/phy/phylink.c +++ b/drivers/net/phy/phylink.c @@ -9,6 +9,7 @@ #include #include #include +#include #include #include #include @@ -550,6 +551,8 @@ static int phylink_validate_mac_and_pcs(struct phylink *pl, unsigned long capabilities; int ret; + lockdep_assert_held(&pl->state_mutex); + /* Get the PCS for this interface mode */ if (pl->mac_ops->mac_select_pcs) { pcs = pl->mac_ops->mac_select_pcs(pl->config, state->interface); @@ -628,6 +631,8 @@ static void phylink_validate_one(struct phylink *pl, struct phy_device *phy, __ETHTOOL_DECLARE_LINK_MODE_MASK(tmp_supported); struct phylink_link_state tmp_state; + lockdep_assert_held(&pl->state_mutex); + linkmode_copy(tmp_supported, supported); tmp_state = *state; @@ -648,15 +653,17 @@ static void phylink_validate_one(struct phylink *pl, struct phy_device *phy, } } -static int phylink_validate_mask(struct phylink *pl, struct phy_device *phy, - unsigned long *supported, - struct phylink_link_state *state, - const unsigned long *interfaces) +static int __phylink_validate_mask(struct phylink *pl, struct phy_device *phy, + unsigned long *supported, + struct phylink_link_state *state, + const unsigned long *interfaces) { __ETHTOOL_DECLARE_LINK_MODE_MASK(all_adv) = { 0, }; __ETHTOOL_DECLARE_LINK_MODE_MASK(all_s) = { 0, }; int interface; + lockdep_assert_held(&pl->state_mutex); + for_each_set_bit(interface, interfaces, PHY_INTERFACE_MODE_MAX) phylink_validate_one(pl, phy, supported, state, interface, all_s, all_adv); @@ -667,14 +674,30 @@ static int phylink_validate_mask(struct phylink *pl, struct phy_device *phy, return phylink_is_empty_linkmode(supported) ? -EINVAL : 0; } -static int phylink_validate(struct phylink *pl, unsigned long *supported, - struct phylink_link_state *state) +static int phylink_validate_mask(struct phylink *pl, struct phy_device *phy, + unsigned long *supported, + struct phylink_link_state *state, + const unsigned long *interfaces) +{ + int ret; + + mutex_lock(&pl->state_mutex); + ret = __phylink_validate_mask(pl, phy, supported, state, interfaces); + mutex_unlock(&pl->state_mutex); + + return ret; +} + +static int __phylink_validate(struct phylink *pl, unsigned long *supported, + struct phylink_link_state *state) { const unsigned long *interfaces = pl->supported_interfaces; + lockdep_assert_held(&pl->state_mutex); + if (state->interface == PHY_INTERFACE_MODE_NA) - return phylink_validate_mask(pl, NULL, supported, state, - interfaces); + return __phylink_validate_mask(pl, NULL, supported, state, + interfaces); if (!test_bit(state->interface, interfaces)) return -EINVAL; @@ -682,6 +705,18 @@ static int phylink_validate(struct phylink *pl, unsigned long *supported, return phylink_validate_mac_and_pcs(pl, supported, state); } +static int phylink_validate(struct phylink *pl, unsigned long *supported, + struct phylink_link_state *state) +{ + int ret; + + mutex_lock(&pl->state_mutex); + ret = __phylink_validate(pl, supported, state); + mutex_unlock(&pl->state_mutex); + + return ret; +} + static void phylink_fill_fixedlink_supported(unsigned long *supported) { linkmode_set_bit(ETHTOOL_LINK_MODE_Pause_BIT, supported); @@ -2117,7 +2152,7 @@ void phylink_update_mac_pause_capabilities(struct phylink *pl, unsigned long mac else if (pl->sfp_bus) linkmode_and(pl->supported, pl->supported, pl->sfp_support); - phylink_validate(pl, pl->supported, config); + __phylink_validate(pl, pl->supported, config); pause_state = config->pause; -- 2.55.0