From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id EEEB427280A; Mon, 13 Apr 2026 16:20:59 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1776097260; cv=none; b=Tq/XURZUl88h099jkbUV6YIt2KUKu4fEqmbl5cDmb1y8c9ILB2pVCoaLTuqwCOEt4QPYXm+cMxShlj4x9IPklMBVvRLXJFg4wksXNqNKSUlmPT7HVXRa1980eiePOYsapGUrXNxtBCbQj8CcWvgQbG/hQ2l2gdeeS7ymC6FdNyA= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1776097260; c=relaxed/simple; bh=ekEU23To01k6knlFaq8y7Ux+P62YCu+0ArnZvK5So+Y=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=Hdo/oPkQgNWmHjkclOBjM65DxtbVYPzm8i8jBqO3/4jkQPRh03PlwFR3LJKGoLHeXDiQvsBRmbbLqlzU6L4ECax5rOekzEgzjlyYsCMnUSnBqHzbNPCqNPGOTbTieVRMfhGD5n+wfReh5H4vAtXHYMVrJE6VllTln3Du0N2B3V0= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=iI0tmzaX; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b="iI0tmzaX" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 8417CC2BCAF; Mon, 13 Apr 2026 16:20:59 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1776097259; bh=ekEU23To01k6knlFaq8y7Ux+P62YCu+0ArnZvK5So+Y=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=iI0tmzaXUsqbifqa+sVvstqWqP7mZ5P29H5i+KYDOUjNncjhyfPZ9xTsGN8v+ybF8 1FmsUWkBRo6pOChaq5PBWuBOgv6m5rwxdhgAmhKvaKFsZ9YhC5V65bE9wKKwmbMZDa 4+ICfc0PaAXcJ66Y4IM3cN1JIX1J2pHaDqmNJH48= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Vladimir Oltean , Ioana Ciornei , Paolo Abeni , Sasha Levin Subject: [PATCH 5.15 068/570] net: dpaa2-switch: serialize changes to priv->mac with a mutex Date: Mon, 13 Apr 2026 17:53:19 +0200 Message-ID: <20260413155832.990215154@linuxfoundation.org> X-Mailer: git-send-email 2.53.0 In-Reply-To: <20260413155830.386096114@linuxfoundation.org> References: <20260413155830.386096114@linuxfoundation.org> User-Agent: quilt/0.69 X-stable: review X-Patchwork-Hint: ignore Precedence: bulk X-Mailing-List: stable@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit 5.15-stable review patch. If anyone has any objections, please let me know. ------------------ From: Vladimir Oltean [ Upstream commit 3c7f44fa9c4c8a9154935ca49e4cf45c14240335 ] The dpaa2-switch driver uses a DPMAC in the same way as the dpaa2-eth driver, so we need to duplicate the locking solution established by the previous change to the switch driver as well. Signed-off-by: Vladimir Oltean Reviewed-by: Ioana Ciornei Tested-by: Ioana Ciornei Signed-off-by: Paolo Abeni Stable-dep-of: 74badb9c20b1 ("dpaa2-switch: Fix interrupt storm after receiving bad if_id in IRQ handler") Signed-off-by: Sasha Levin --- .../freescale/dpaa2/dpaa2-switch-ethtool.c | 32 +++++++++++++++---- .../ethernet/freescale/dpaa2/dpaa2-switch.c | 31 ++++++++++++++++-- .../ethernet/freescale/dpaa2/dpaa2-switch.h | 2 ++ 3 files changed, 55 insertions(+), 10 deletions(-) diff --git a/drivers/net/ethernet/freescale/dpaa2/dpaa2-switch-ethtool.c b/drivers/net/ethernet/freescale/dpaa2/dpaa2-switch-ethtool.c index 0b41a945e0fff..dc9f4ad8a061d 100644 --- a/drivers/net/ethernet/freescale/dpaa2/dpaa2-switch-ethtool.c +++ b/drivers/net/ethernet/freescale/dpaa2/dpaa2-switch-ethtool.c @@ -60,11 +60,18 @@ dpaa2_switch_get_link_ksettings(struct net_device *netdev, { struct ethsw_port_priv *port_priv = netdev_priv(netdev); struct dpsw_link_state state = {0}; - int err = 0; + int err; + + mutex_lock(&port_priv->mac_lock); - if (dpaa2_switch_port_is_type_phy(port_priv)) - return phylink_ethtool_ksettings_get(port_priv->mac->phylink, - link_ksettings); + if (dpaa2_switch_port_is_type_phy(port_priv)) { + err = phylink_ethtool_ksettings_get(port_priv->mac->phylink, + link_ksettings); + mutex_unlock(&port_priv->mac_lock); + return err; + } + + mutex_unlock(&port_priv->mac_lock); err = dpsw_if_get_link_state(port_priv->ethsw_data->mc_io, 0, port_priv->ethsw_data->dpsw_handle, @@ -99,9 +106,16 @@ dpaa2_switch_set_link_ksettings(struct net_device *netdev, bool if_running; int err = 0, ret; - if (dpaa2_switch_port_is_type_phy(port_priv)) - return phylink_ethtool_ksettings_set(port_priv->mac->phylink, - link_ksettings); + mutex_lock(&port_priv->mac_lock); + + if (dpaa2_switch_port_is_type_phy(port_priv)) { + err = phylink_ethtool_ksettings_set(port_priv->mac->phylink, + link_ksettings); + mutex_unlock(&port_priv->mac_lock); + return err; + } + + mutex_unlock(&port_priv->mac_lock); /* Interface needs to be down to change link settings */ if_running = netif_running(netdev); @@ -196,8 +210,12 @@ static void dpaa2_switch_ethtool_get_stats(struct net_device *netdev, dpaa2_switch_ethtool_counters[i].name, err); } + mutex_lock(&port_priv->mac_lock); + if (dpaa2_switch_port_has_mac(port_priv)) dpaa2_mac_get_ethtool_stats(port_priv->mac, data + i); + + mutex_unlock(&port_priv->mac_lock); } const struct ethtool_ops dpaa2_switch_port_ethtool_ops = { diff --git a/drivers/net/ethernet/freescale/dpaa2/dpaa2-switch.c b/drivers/net/ethernet/freescale/dpaa2/dpaa2-switch.c index a2812229511c3..92500e55ab931 100644 --- a/drivers/net/ethernet/freescale/dpaa2/dpaa2-switch.c +++ b/drivers/net/ethernet/freescale/dpaa2/dpaa2-switch.c @@ -602,8 +602,11 @@ static int dpaa2_switch_port_link_state_update(struct net_device *netdev) /* When we manage the MAC/PHY using phylink there is no need * to manually update the netif_carrier. + * We can avoid locking because we are called from the "link changed" + * IRQ handler, which is the same as the "endpoint changed" IRQ handler + * (the writer to port_priv->mac), so we cannot race with it. */ - if (dpaa2_switch_port_is_type_phy(port_priv)) + if (dpaa2_mac_is_type_phy(port_priv->mac)) return 0; /* Interrupts are received even though no one issued an 'ifconfig up' @@ -683,6 +686,8 @@ static int dpaa2_switch_port_open(struct net_device *netdev) struct ethsw_core *ethsw = port_priv->ethsw_data; int err; + mutex_lock(&port_priv->mac_lock); + if (!dpaa2_switch_port_is_type_phy(port_priv)) { /* Explicitly set carrier off, otherwise * netif_carrier_ok() will return true and cause 'ip link show' @@ -696,6 +701,7 @@ static int dpaa2_switch_port_open(struct net_device *netdev) port_priv->ethsw_data->dpsw_handle, port_priv->idx); if (err) { + mutex_unlock(&port_priv->mac_lock); netdev_err(netdev, "dpsw_if_enable err %d\n", err); return err; } @@ -705,6 +711,8 @@ static int dpaa2_switch_port_open(struct net_device *netdev) if (dpaa2_switch_port_is_type_phy(port_priv)) phylink_start(port_priv->mac->phylink); + mutex_unlock(&port_priv->mac_lock); + return 0; } @@ -714,6 +722,8 @@ static int dpaa2_switch_port_stop(struct net_device *netdev) struct ethsw_core *ethsw = port_priv->ethsw_data; int err; + mutex_lock(&port_priv->mac_lock); + if (dpaa2_switch_port_is_type_phy(port_priv)) { phylink_stop(port_priv->mac->phylink); } else { @@ -721,6 +731,8 @@ static int dpaa2_switch_port_stop(struct net_device *netdev) netif_carrier_off(netdev); } + mutex_unlock(&port_priv->mac_lock); + err = dpsw_if_disable(port_priv->ethsw_data->mc_io, 0, port_priv->ethsw_data->dpsw_handle, port_priv->idx); @@ -1467,7 +1479,9 @@ static int dpaa2_switch_port_connect_mac(struct ethsw_port_priv *port_priv) } } + mutex_lock(&port_priv->mac_lock); port_priv->mac = mac; + mutex_unlock(&port_priv->mac_lock); return 0; @@ -1482,9 +1496,12 @@ static int dpaa2_switch_port_connect_mac(struct ethsw_port_priv *port_priv) static void dpaa2_switch_port_disconnect_mac(struct ethsw_port_priv *port_priv) { - struct dpaa2_mac *mac = port_priv->mac; + struct dpaa2_mac *mac; + mutex_lock(&port_priv->mac_lock); + mac = port_priv->mac; port_priv->mac = NULL; + mutex_unlock(&port_priv->mac_lock); if (!mac) return; @@ -1503,6 +1520,7 @@ static irqreturn_t dpaa2_switch_irq0_handler_thread(int irq_num, void *arg) struct ethsw_port_priv *port_priv; u32 status = ~0; int err, if_id; + bool had_mac; err = dpsw_get_irq_status(ethsw->mc_io, 0, ethsw->dpsw_handle, DPSW_IRQ_INDEX_IF, &status); @@ -1525,7 +1543,12 @@ static irqreturn_t dpaa2_switch_irq0_handler_thread(int irq_num, void *arg) if (status & DPSW_IRQ_EVENT_ENDPOINT_CHANGED) { rtnl_lock(); - if (dpaa2_switch_port_has_mac(port_priv)) + /* We can avoid locking because the "endpoint changed" IRQ + * handler is the only one who changes priv->mac at runtime, + * so we are not racing with anyone. + */ + had_mac = !!port_priv->mac; + if (had_mac) dpaa2_switch_port_disconnect_mac(port_priv); else dpaa2_switch_port_connect_mac(port_priv); @@ -3281,6 +3304,8 @@ static int dpaa2_switch_probe_port(struct ethsw_core *ethsw, port_priv->netdev = port_netdev; port_priv->ethsw_data = ethsw; + mutex_init(&port_priv->mac_lock); + port_priv->idx = port_idx; port_priv->stp_state = BR_STATE_FORWARDING; diff --git a/drivers/net/ethernet/freescale/dpaa2/dpaa2-switch.h b/drivers/net/ethernet/freescale/dpaa2/dpaa2-switch.h index 9898073abe012..42b3ca73f55d5 100644 --- a/drivers/net/ethernet/freescale/dpaa2/dpaa2-switch.h +++ b/drivers/net/ethernet/freescale/dpaa2/dpaa2-switch.h @@ -161,6 +161,8 @@ struct ethsw_port_priv { struct dpaa2_switch_filter_block *filter_block; struct dpaa2_mac *mac; + /* Protects against changes to port_priv->mac */ + struct mutex mac_lock; }; /* Switch data */ -- 2.51.0