From patchwork Wed May 12 14:50:59 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Greg KH X-Patchwork-Id: 436563 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-19.4 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_CR_TRAILER, INCLUDES_PATCH, MAILING_LIST_MULTI, SPF_HELO_NONE, SPF_PASS, USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id E1947C4161D for ; Wed, 12 May 2021 16:31:28 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 90061613C3 for ; Wed, 12 May 2021 16:31:26 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S241866AbhELQbB (ORCPT ); Wed, 12 May 2021 12:31:01 -0400 Received: from mail.kernel.org ([198.145.29.99]:42878 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S240914AbhELQZx (ORCPT ); Wed, 12 May 2021 12:25:53 -0400 Received: by mail.kernel.org (Postfix) with ESMTPSA id 42656619B0; Wed, 12 May 2021 15:48:52 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1620834532; bh=EOegCxrkTb4mmbhBbMhHZq+nxXOat+4HFt7I+Iaq0B8=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=m06SciAUHqTukqRVn+OdgxVDxXo6sPOL6Ahz02zp16MKF/LGxqKEzab1g2CozPfPx Niy3MGIVGzrnAfQILtigKVzBOcpUcSqQ4eRGfe8EfWqCa6G+c4haRLd44FQG9+aXlo bFRldu6+U/bmLjlL1dxjOH90alkqfkI7JvbExJ6s= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Tobias Waldekranz , Andrew Lunn , "David S. Miller" , Sasha Levin Subject: [PATCH 5.11 582/601] net: dsa: mv88e6xxx: Fix 6095/6097/6185 ports in non-SERDES CMODE Date: Wed, 12 May 2021 16:50:59 +0200 Message-Id: <20210512144847.013968899@linuxfoundation.org> X-Mailer: git-send-email 2.31.1 In-Reply-To: <20210512144827.811958675@linuxfoundation.org> References: <20210512144827.811958675@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: stable@vger.kernel.org From: Tobias Waldekranz [ Upstream commit 6066234aa33850e9e35e7be82d92b9e9091e774b ] The .serdes_get_lane op used the magic value 0xff to indicate a valid SERDES lane and 0 signaled that a non-SERDES mode was set on the port. Unfortunately, "0" is also a valid lane ID, so even when these ports where configured to e.g. RGMII the driver would set them up as SERDES ports. - Replace 0xff with 0 to indicate a valid lane ID. The number is on the one hand just as arbitrary, but it is at least the first valid one and therefore less of a surprise. - Follow the other .serdes_get_lane implementations and return -ENODEV in the case where no SERDES is assigned to the port. Fixes: f5be107c3338 ("net: dsa: mv88e6xxx: Support serdes ports on MV88E6097/6095/6185") Signed-off-by: Tobias Waldekranz Reviewed-by: Andrew Lunn Signed-off-by: David S. Miller Signed-off-by: Sasha Levin --- drivers/net/dsa/mv88e6xxx/serdes.c | 6 +++--- 1 file changed, 3 insertions(+), 3 deletions(-) diff --git a/drivers/net/dsa/mv88e6xxx/serdes.c b/drivers/net/dsa/mv88e6xxx/serdes.c index 3195936dc5be..2ce04fef698d 100644 --- a/drivers/net/dsa/mv88e6xxx/serdes.c +++ b/drivers/net/dsa/mv88e6xxx/serdes.c @@ -443,15 +443,15 @@ int mv88e6185_serdes_power(struct mv88e6xxx_chip *chip, int port, u8 lane, u8 mv88e6185_serdes_get_lane(struct mv88e6xxx_chip *chip, int port) { /* There are no configurable serdes lanes on this switch chip but we - * need to return non-zero so that callers of + * need to return a non-negative lane number so that callers of * mv88e6xxx_serdes_get_lane() know this is a serdes port. */ switch (chip->ports[port].cmode) { case MV88E6185_PORT_STS_CMODE_SERDES: case MV88E6185_PORT_STS_CMODE_1000BASE_X: - return 0xff; - default: return 0; + default: + return -ENODEV; } }