From nobody Thu Nov 28 02:35:52 2024 Received: from pidgin.makrotopia.org (pidgin.makrotopia.org [185.142.180.65]) (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 963D712C81F; Fri, 4 Oct 2024 15:52:13 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=185.142.180.65 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1728057135; cv=none; b=cHqi/SorOaacqeq1m6KfRcHlV9vQiS2BzO1Fl5CH7N7yJ6Vv5x19rX6vf4vCuvtE/9CmVO86mtUMjlEYwGxnKvaZj9lhQiYxu6UVmMb1TtAhJiclOoaBfPeqJEVm1X5/17u90NXBttGIHB78mwDFevKj3TcGZU1lkZTvNP6PpOY= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1728057135; c=relaxed/simple; bh=izWmkxzfoMRvkuKlP2NpzZGq/RrFuIXEq8KvqTeN6eQ=; h=Date:From:To:Subject:Message-ID:MIME-Version:Content-Type: Content-Disposition; b=YloNQ16+bqQJO+1pHuVNf5s4EJcsQChgJOnrVJB+yWIds+95d0M4VjgGXPblA3q0tTKg115Ssk5uG8bZIomkDm/LaB3G8xxAZb65vUNnMMO91NuaKsF8FuYZRMypSOCKHAD844E0oahbuNOxgudMqnrWvo1iK9bBDqxNdfqtioY= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=makrotopia.org; spf=pass smtp.mailfrom=makrotopia.org; arc=none smtp.client-ip=185.142.180.65 Authentication-Results: smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=makrotopia.org Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=makrotopia.org Received: from local by pidgin.makrotopia.org with esmtpsa (TLS1.3:TLS_AES_256_GCM_SHA384:256) (Exim 4.98) (envelope-from ) id 1swkbB-000000008I7-3Tst; Fri, 04 Oct 2024 15:52:09 +0000 Date: Fri, 4 Oct 2024 16:52:04 +0100 From: Daniel Golle To: Andrew Lunn , Heiner Kallweit , Russell King , "David S. Miller" , Eric Dumazet , Jakub Kicinski , Paolo Abeni , netdev@vger.kernel.org, linux-kernel@vger.kernel.org Subject: [PATCH net-next] net: phy: realtek: make sure paged read is protected by mutex Message-ID: <792b8c0d1fc194e2b53cb09d45a234bc668e34c6.1728057091.git.daniel@makrotopia.org> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Disposition: inline Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" As we cannot rely on phy_read_paged function before the PHY is identified, the paged read in rtlgen_supports_2_5gbps needs to be open coded as it is being called by the match_phy_device function, ie. before .read_page and .write_page have been populated. Make sure it is also protected by the MDIO bus mutex and use rtl821x_write_page instead of 3 individually locked MDIO bus operations. Signed-off-by: Daniel Golle --- drivers/net/phy/realtek.c | 8 +++++--- 1 file changed, 5 insertions(+), 3 deletions(-) diff --git a/drivers/net/phy/realtek.c b/drivers/net/phy/realtek.c index 3941cfa1c5f2..c4d0d93523ad 100644 --- a/drivers/net/phy/realtek.c +++ b/drivers/net/phy/realtek.c @@ -1030,9 +1030,11 @@ static bool rtlgen_supports_2_5gbps(struct phy_devic= e *phydev) { int val; =20 - phy_write(phydev, RTL821x_PAGE_SELECT, 0xa61); - val =3D phy_read(phydev, 0x13); - phy_write(phydev, RTL821x_PAGE_SELECT, 0); + mutex_lock(&phydev->mdio.bus->mdio_lock); + rtl821x_write_page(phydev, 0xa61); + val =3D __phy_read(phydev, 0x13); + rtl821x_write_page(phydev, 0); + mutex_unlock(&phydev->mdio.bus->mdio_lock); =20 return val >=3D 0 && val & MDIO_PMA_SPEED_2_5G; } --=20 2.46.2