From patchwork Wed Jun 21 09:31:00 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Markus Schneider-Pargmann X-Patchwork-Id: 13286979 X-Patchwork-Delegate: kuba@kernel.org Received: from lindbergh.monkeyblade.net (lindbergh.monkeyblade.net [23.128.96.19]) (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 B7916DF57 for ; Wed, 21 Jun 2023 09:31:15 +0000 (UTC) Received: from mail-wr1-x431.google.com (mail-wr1-x431.google.com [IPv6:2a00:1450:4864:20::431]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id A30291989 for ; Wed, 21 Jun 2023 02:31:13 -0700 (PDT) Received: by mail-wr1-x431.google.com with SMTP id ffacd0b85a97d-30fbf253dc7so4561748f8f.0 for ; Wed, 21 Jun 2023 02:31:13 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=baylibre-com.20221208.gappssmtp.com; s=20221208; t=1687339872; x=1689931872; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:from:to:cc:subject:date :message-id:reply-to; bh=ybtO4Wog7AXA+LuJ7ppZ2BwN9dyYZ5NmmDbgKQHeLHM=; b=GbEYPR52b9eyHWmMfQU9tvxe081wY8nIF6gJ+LgJ2SlgFQ61zD+2NzGNljuXKeWy24 LICZ2j4cIUIqB4M9uHH9OBqCAf81admdZooSMEzGnVTZlENGAJArH+OU0feZq4wZJOIJ Vvmyp1jnZUar0x3VDO97AP/HdoH9AoCKcyIa/32nekVLkhrKozliSJQmm6MdckAS7A1d 43G5aKpBfnpfF8e4HGgwvkwzwk0ERyZ/t+jxxVJGFEiSAhKR7nkVegtGqXe0vJySt9CZ Z0BZB4msJpteWeG4DHueVVr5CfwIUnYQExTnPDUsxSv8vYpYVsW6e2jl8xXbVPL4Qhu4 tNWA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20221208; t=1687339872; x=1689931872; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:x-gm-message-state:from:to:cc :subject:date:message-id:reply-to; bh=ybtO4Wog7AXA+LuJ7ppZ2BwN9dyYZ5NmmDbgKQHeLHM=; b=ECUwiyezT+xjjEG6yX3h5rfg5eik2rwfPM8LPPltQYpzvlKzQX5BKJj0J6xArvzdrx TC8PLgXdXTmffV5vNK3ZBXBGB9tDpxT27SAladswu1e0RmrdDpRE+pJRAafLQerR3FT2 RFsLlvt4Bfc4Opt6aTFOP3JqQvwv0Jue2aOiwETLexvwIpQi9L9iQdnCCnlxP/YxzfU8 mF/UJ/n/w1XGTFj+b88n40yQ3sSdM/YS3DlIeda3ZxOp60Eqw9p5/47ffBl9LrCJlPBS h+Y0gGrnYxT97PnVSv6QbpX3oX5SsCXY3ANRX1tiHOiRmj6udAhFEBI+GeOLtJdnPVS4 wqGA== X-Gm-Message-State: AC+VfDw2K1j+9mguDP2PlYKv16rD1HOtLT7fOtR9JH9YgJO67V1h7zqL FLoM98Cp1GnH6iBSzPxSh3W0Tg== X-Google-Smtp-Source: ACHHUZ6N4ShxDPmm0lHjPVsFzQjzdixQQokpJC6Xp7OpddAHkKElZIycIIwE8vb2xIbBKwges4fvGg== X-Received: by 2002:a5d:6501:0:b0:30f:c420:1743 with SMTP id x1-20020a5d6501000000b0030fc4201743mr12562307wru.26.1687339872182; Wed, 21 Jun 2023 02:31:12 -0700 (PDT) Received: from blmsp.fritz.box ([2001:4091:a247:82fa:b762:4f68:e1ed:5041]) by smtp.gmail.com with ESMTPSA id t10-20020a5d49ca000000b002fe96f0b3acsm3977344wrs.63.2023.06.21.02.31.11 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 21 Jun 2023 02:31:11 -0700 (PDT) From: Markus Schneider-Pargmann To: Wolfgang Grandegger , Marc Kleine-Budde , Rob Herring , Krzysztof Kozlowski Cc: "David S . Miller" , Eric Dumazet , Jakub Kicinski , Paolo Abeni , Conor Dooley , Chandrasekar Ramakrishnan , Michal Kubiak , Vivek Yadav , linux-can@vger.kernel.org, netdev@vger.kernel.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, Simon Horman , Markus Schneider-Pargmann Subject: [PATCH v2 3/6] can: tcan4x5x: Check size of mram configuration Date: Wed, 21 Jun 2023 11:31:00 +0200 Message-Id: <20230621093103.3134655-4-msp@baylibre.com> X-Mailer: git-send-email 2.40.1 In-Reply-To: <20230621093103.3134655-1-msp@baylibre.com> References: <20230621093103.3134655-1-msp@baylibre.com> Precedence: bulk X-Mailing-List: netdev@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Spam-Status: No, score=-1.9 required=5.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,RCVD_IN_DNSWL_NONE,SPF_HELO_NONE,SPF_PASS, T_SCC_BODY_TEXT_LINE autolearn=unavailable autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on lindbergh.monkeyblade.net X-Patchwork-Delegate: kuba@kernel.org To reduce debugging effort in case the mram is misconfigured, add this size check of the DT configuration. Currently if the mram configuration doesn't fit into the available MRAM it just overwrites other areas of the MRAM. Signed-off-by: Markus Schneider-Pargmann Reviewed-by: Michal Kubiak --- drivers/net/can/m_can/m_can.c | 16 ++++++++++++++++ drivers/net/can/m_can/m_can.h | 1 + drivers/net/can/m_can/tcan4x5x-core.c | 5 +++++ 3 files changed, 22 insertions(+) diff --git a/drivers/net/can/m_can/m_can.c b/drivers/net/can/m_can/m_can.c index a5003435802b..1cdd2675f022 100644 --- a/drivers/net/can/m_can/m_can.c +++ b/drivers/net/can/m_can/m_can.c @@ -1887,6 +1887,22 @@ static int register_m_can_dev(struct net_device *dev) return register_candev(dev); } +int m_can_check_mram_cfg(struct m_can_classdev *cdev, u32 mram_max_size) +{ + u32 total_size; + + total_size = cdev->mcfg[MRAM_TXB].off - cdev->mcfg[MRAM_SIDF].off + + cdev->mcfg[MRAM_TXB].num * TXB_ELEMENT_SIZE; + if (total_size > mram_max_size) { + dev_err(cdev->dev, "Total size of mram config(%u) exceeds mram(%u)\n", + total_size, mram_max_size); + return -EINVAL; + } + + return 0; +} +EXPORT_SYMBOL_GPL(m_can_check_mram_cfg); + static void m_can_of_parse_mram(struct m_can_classdev *cdev, const u32 *mram_config_vals) { diff --git a/drivers/net/can/m_can/m_can.h b/drivers/net/can/m_can/m_can.h index a839dc71dc9b..d8150d8128e7 100644 --- a/drivers/net/can/m_can/m_can.h +++ b/drivers/net/can/m_can/m_can.h @@ -101,6 +101,7 @@ int m_can_class_register(struct m_can_classdev *cdev); void m_can_class_unregister(struct m_can_classdev *cdev); int m_can_class_get_clocks(struct m_can_classdev *cdev); int m_can_init_ram(struct m_can_classdev *priv); +int m_can_check_mram_cfg(struct m_can_classdev *cdev, u32 mram_max_size); int m_can_class_suspend(struct device *dev); int m_can_class_resume(struct device *dev); diff --git a/drivers/net/can/m_can/tcan4x5x-core.c b/drivers/net/can/m_can/tcan4x5x-core.c index 2342aa011647..e706518176e4 100644 --- a/drivers/net/can/m_can/tcan4x5x-core.c +++ b/drivers/net/can/m_can/tcan4x5x-core.c @@ -80,6 +80,7 @@ TCAN4X5X_MCAN_IR_RF1F) #define TCAN4X5X_MRAM_START 0x8000 +#define TCAN4X5X_MRAM_SIZE 0x800 #define TCAN4X5X_MCAN_OFFSET 0x1000 #define TCAN4X5X_CLEAR_ALL_INT 0xffffffff @@ -307,6 +308,10 @@ static int tcan4x5x_can_probe(struct spi_device *spi) if (!mcan_class) return -ENOMEM; + ret = m_can_check_mram_cfg(mcan_class, TCAN4X5X_MRAM_SIZE); + if (ret) + goto out_m_can_class_free_dev; + priv = cdev_to_priv(mcan_class); priv->power = devm_regulator_get_optional(&spi->dev, "vsup");