From patchwork Thu Jun 22 16:34:49 2017 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Colin King X-Patchwork-Id: 9804769 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork.web.codeaurora.org (Postfix) with ESMTP id AA73C60329 for ; Thu, 22 Jun 2017 16:35:27 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id E100E28564 for ; Thu, 22 Jun 2017 16:35:20 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id D5735285E1; Thu, 22 Jun 2017 16:35:20 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-1.9 required=2.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID autolearn=ham version=3.3.1 Received: from bombadil.infradead.org (bombadil.infradead.org [65.50.211.133]) (using TLSv1.2 with cipher AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.wl.linuxfoundation.org (Postfix) with ESMTPS id 6DD4528564 for ; Thu, 22 Jun 2017 16:35:20 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20170209; h=Sender: Content-Transfer-Encoding:Content-Type:Cc:List-Subscribe:List-Help:List-Post: List-Archive:List-Unsubscribe:List-Id:MIME-Version:Message-Id:Date:Subject:To :From:Reply-To:Content-ID:Content-Description:Resent-Date:Resent-From: Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:In-Reply-To:References: List-Owner; bh=Vr7STaLOcJP1XCeoy1cu6bUhwaxTWQWKcaHmTn8qLjY=; b=nWPxzkyFreTZl8 D0pVw769MqsvX5BHP2S2jYrNLhykca/M5INvmgDJftd+csFtmJB/Edz3RbqnourHZz0PKfDNCKF6f baOaoaqHOfkkX9YetU3bJ+YB6ojE9trXdhvjL97J6riXKWXRvfraWIY44mUWMJrPo6GShRNeHX4Lu 54hit90cdERe306UnKQv5Z6N1NwPSHXDI+M2OKOBCSLSpEOVz+PPnBW6Day9uJ4OgeE1fjg/uGDtV lQDQkz0jHDqwvmPUYoUToZdNoj9lwOAw1MwnCPz2MlHL+CsxuB+qRIrq6QyeuZy7qNSfxRzdj42wU 8ZbqeFvzHJ4UkGWF/8pA==; Received: from localhost ([127.0.0.1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.87 #1 (Red Hat Linux)) id 1dO54f-000393-N1; Thu, 22 Jun 2017 16:35:17 +0000 Received: from youngberry.canonical.com ([91.189.89.112]) by bombadil.infradead.org with esmtps (Exim 4.87 #1 (Red Hat Linux)) id 1dO54c-0001uH-7F for linux-arm-kernel@lists.infradead.org; Thu, 22 Jun 2017 16:35:15 +0000 Received: from 1.general.cking.uk.vpn ([10.172.193.212] helo=localhost) by youngberry.canonical.com with esmtpsa (TLS1.0:RSA_AES_256_CBC_SHA1:32) (Exim 4.76) (envelope-from ) id 1dO54E-0003Z5-8s; Thu, 22 Jun 2017 16:34:50 +0000 From: Colin King To: Mark Brown , Maxime Coquelin , Alexandre Torgue , linux-spi@vger.kernel.org, linux-arm-kernel@lists.infradead.org Subject: [PATCH] spi: stm32: fix error check on mbr being -ve Date: Thu, 22 Jun 2017 17:34:49 +0100 Message-Id: <20170622163449.23925-1-colin.king@canonical.com> X-Mailer: git-send-email 2.11.0 MIME-Version: 1.0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20170622_093514_441870_B42641A2 X-CRM114-Status: UNSURE ( 9.31 ) X-CRM114-Notice: Please train this message. X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.21 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: kernel-janitors@vger.kernel.org, linux-kernel@vger.kernel.org Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+patchwork-linux-arm=patchwork.kernel.org@lists.infradead.org X-Virus-Scanned: ClamAV using ClamSMTP From: Colin Ian King The error check of mbr < 0 is always false because mbr is a u32. Make mbt an int so that a -ve error return from stm32_spi_prepare_mbr can be detected. Detected by CoverityScan, CID#1446586 ("Unsigned compared against 0") Signed-off-by: Colin Ian King --- drivers/spi/spi-stm32.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/drivers/spi/spi-stm32.c b/drivers/spi/spi-stm32.c index b75909e7b117..82a6616f46b8 100644 --- a/drivers/spi/spi-stm32.c +++ b/drivers/spi/spi-stm32.c @@ -857,7 +857,7 @@ static int stm32_spi_transfer_one_setup(struct stm32_spi *spi, } if (spi->cur_speed != transfer->speed_hz) { - u32 mbr; + int mbr; /* Update spi->cur_speed with real clock speed */ mbr = stm32_spi_prepare_mbr(spi, transfer->speed_hz); @@ -869,7 +869,7 @@ static int stm32_spi_transfer_one_setup(struct stm32_spi *spi, transfer->speed_hz = spi->cur_speed; cfg1_clrb |= SPI_CFG1_MBR; - cfg1_setb |= (mbr << SPI_CFG1_MBR_SHIFT) & SPI_CFG1_MBR; + cfg1_setb |= ((u32)mbr << SPI_CFG1_MBR_SHIFT) & SPI_CFG1_MBR; } if (cfg1_clrb || cfg1_setb)