From patchwork Fri May 13 14:23:18 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Greg KH X-Patchwork-Id: 572952 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 5B62CC433EF for ; Fri, 13 May 2022 14:24:55 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1358449AbiEMOYw (ORCPT ); Fri, 13 May 2022 10:24:52 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:38298 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1356878AbiEMOYj (ORCPT ); Fri, 13 May 2022 10:24:39 -0400 Received: from ams.source.kernel.org (ams.source.kernel.org [IPv6:2604:1380:4601:e00::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 9ADCE50B24; Fri, 13 May 2022 07:24:32 -0700 (PDT) Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ams.source.kernel.org (Postfix) with ESMTPS id 4B9B0B83066; Fri, 13 May 2022 14:24:31 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id AF9B3C34100; Fri, 13 May 2022 14:24:29 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1652451870; bh=fHimoKp/mXL+UxFA5uk5tI0L5eJ2S8lPXohgxQuYI1g=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=LA2tCaDDc27LI0fL/D/FqiHVrC1jjwQhSyyQ6+sGfEaRS2bwTvGnX9+NPT5rWufDL KzxvMY8OG6oOXhkzJ1Nd9qoVWPucC2XobL12u+BDUesWB15vTqZSxB9glHHxlx2Ag+ 97ISMop1FPc6XOpUH4+2lHRY5nEBfFOJOxBaAeNM= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Andreas Larsson , Marc Kleine-Budde Subject: [PATCH 4.9 3/7] can: grcan: grcan_probe(): fix broken system id check for errata workaround needs Date: Fri, 13 May 2022 16:23:18 +0200 Message-Id: <20220513142226.012724219@linuxfoundation.org> X-Mailer: git-send-email 2.36.1 In-Reply-To: <20220513142225.909697091@linuxfoundation.org> References: <20220513142225.909697091@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: stable@vger.kernel.org From: Andreas Larsson commit 1e93ed26acf03fe6c97c6d573a10178596aadd43 upstream. The systemid property was checked for in the wrong place of the device tree and compared to the wrong value. Fixes: 6cec9b07fe6a ("can: grcan: Add device driver for GRCAN and GRHCAN cores") Link: https://lore.kernel.org/all/20220429084656.29788-3-andreas@gaisler.com Cc: stable@vger.kernel.org Signed-off-by: Andreas Larsson Signed-off-by: Marc Kleine-Budde Signed-off-by: Greg Kroah-Hartman --- drivers/net/can/grcan.c | 16 +++++++++++----- 1 file changed, 11 insertions(+), 5 deletions(-) --- a/drivers/net/can/grcan.c +++ b/drivers/net/can/grcan.c @@ -245,7 +245,7 @@ struct grcan_device_config { .rxsize = GRCAN_DEFAULT_BUFFER_SIZE, \ } -#define GRCAN_TXBUG_SAFE_GRLIB_VERSION 0x4100 +#define GRCAN_TXBUG_SAFE_GRLIB_VERSION 4100 #define GRLIB_VERSION_MASK 0xffff /* GRCAN private data structure */ @@ -1665,6 +1665,7 @@ exit_free_candev: static int grcan_probe(struct platform_device *ofdev) { struct device_node *np = ofdev->dev.of_node; + struct device_node *sysid_parent; struct resource *res; u32 sysid, ambafreq; int irq, err; @@ -1674,10 +1675,15 @@ static int grcan_probe(struct platform_d /* Compare GRLIB version number with the first that does not * have the tx bug (see start_xmit) */ - err = of_property_read_u32(np, "systemid", &sysid); - if (!err && ((sysid & GRLIB_VERSION_MASK) - >= GRCAN_TXBUG_SAFE_GRLIB_VERSION)) - txbug = false; + sysid_parent = of_find_node_by_path("/ambapp0"); + if (sysid_parent) { + of_node_get(sysid_parent); + err = of_property_read_u32(sysid_parent, "systemid", &sysid); + if (!err && ((sysid & GRLIB_VERSION_MASK) >= + GRCAN_TXBUG_SAFE_GRLIB_VERSION)) + txbug = false; + of_node_put(sysid_parent); + } err = of_property_read_u32(np, "freq", &ambafreq); if (err) {