From patchwork Tue Sep 24 13:40:08 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Ben Dooks X-Patchwork-Id: 13810982 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 bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id C4CC7CF9C6F for ; Tue, 24 Sep 2024 13:41:39 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender:List-Subscribe:List-Help :List-Post:List-Archive:List-Unsubscribe:List-Id:Content-Transfer-Encoding: MIME-Version:References:In-Reply-To:Message-Id:Date:Subject:Cc:To:From: Reply-To:Content-Type:Content-ID:Content-Description:Resent-Date:Resent-From: Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Owner; bh=RIEd/+3RUZ5FAc5/2lhcwWi5vz2ND8NO2C1zeGC37t8=; b=ksaNYr9w/MsZ+/9jzONo2nrwc1 E9qndN0aQRm45em7FN/wM+3u1duSI7zENrDXhoYrsFZyCt0cTRxp+vbmGkNeTQRX4HtU31CthdzFs +nR1hT26HEzsO8xXD1DGtEdKjj36kHf45Lt5cH541KBmnIZLPeQxVADLRYDaijlJ7oY2jQOQ0aIwN nXo7tkuiWTEW/lM/gLVdX96WgiyPg30x3NIpDlhSaY37ZDLCDVzm6Zsc8O12NTdtaZLwayGd4+/L/ cehhO8THrxZvVXS+ooMa/doHWexbjLXXXXWhhPRHcS5zNW/5ZnhY7jK4k2PlQgLj8JRtCsyxBaH7N uYO1QPFA==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.98 #2 (Red Hat Linux)) id 1st5nB-00000002SVR-2num; Tue, 24 Sep 2024 13:41:25 +0000 Received: from imap5.colo.codethink.co.uk ([78.40.148.171]) by bombadil.infradead.org with esmtps (Exim 4.98 #2 (Red Hat Linux)) id 1st5m3-00000002SQM-3Ipw for linux-arm-kernel@lists.infradead.org; Tue, 24 Sep 2024 13:40:17 +0000 DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=codethink.co.uk; s=imap5-20230908; h=Sender:Content-Transfer-Encoding: MIME-Version:References:In-Reply-To:Message-Id:Date:Subject:Cc:To:From: Reply-To:Content-Type:Content-ID:Content-Description:Resent-Date:Resent-From: Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Id:List-Help: List-Unsubscribe:List-Subscribe:List-Post:List-Owner:List-Archive; bh=RIEd/+3RUZ5FAc5/2lhcwWi5vz2ND8NO2C1zeGC37t8=; b=dscdQn5nW9VwStRMkAIgbD6ASW IRHhJctdQbv3K2aATWWIubCJ8QfPJFQDRrkM6dxmkYiaH1bZ3C/t81hZAaxx12FcLGJjERkNnArLZ k3PiciPhsX8UjxrRfocFnl+JfPk1NGbmYdafgSqi/nFAyc0thIzXFGabw/cwaAeVDdI6lu5bXhtDJ LrDCj6ctnnbVUIluPTRciUq/GZ50iAAhOQtNFFbrJFO9T9N+GQgrDqdjQCIW3UnJdnZOKVmiMCp7N 1k0r5hVYgmi1plBFhKXbpnefAjDYLEm42an9dzQi9ZXZ5Tpi6oQ+Xi/fH9CxZztpebqJS5VDyC2N+ ZHsmXAfA==; Received: from [63.135.74.212] (helo=rainbowdash) by imap5.colo.codethink.co.uk with esmtpsa (Exim 4.94.2 #2 (Debian)) id 1st5ly-003YDw-Tj; Tue, 24 Sep 2024 14:40:11 +0100 Received: from ben by rainbowdash with local (Exim 4.98) (envelope-from ) id 1st5ly-00000000UFR-3j6O; Tue, 24 Sep 2024 14:40:10 +0100 From: Ben Dooks To: linux-spi@vger.kernel.org Cc: linux-samsung-soc@vger.kernel.org, linux-arm-kernel@lists.infradead.org, Alim Akhtar , Krzysztof Kozlowski , Andi Shyti , Mark Brown , Ben Dooks Subject: [PATCH 1/2] spi: s3c64xx: fix timeout counters in flush_fifo Date: Tue, 24 Sep 2024 14:40:08 +0100 Message-Id: <20240924134009.116247-2-ben.dooks@codethink.co.uk> X-Mailer: git-send-email 2.37.2.352.g3c44437643 In-Reply-To: <20240924134009.116247-1-ben.dooks@codethink.co.uk> References: <20240924134009.116247-1-ben.dooks@codethink.co.uk> MIME-Version: 1.0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20240924_064015_932268_04DAE9F3 X-CRM114-Status: GOOD ( 13.78 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org In the s3c64xx_flush_fifo() code, the loops counter is post-decremented in the do { } while(test && loops--) condition. This means the loops is left at the unsigned equivalent of -1 if the loop times out. The test after will never pass as if tests for loops == 0. Signed-off-by: Ben Dooks --- drivers/spi/spi-s3c64xx.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/drivers/spi/spi-s3c64xx.c b/drivers/spi/spi-s3c64xx.c index 833c58c88e40..6ab416a33966 100644 --- a/drivers/spi/spi-s3c64xx.c +++ b/drivers/spi/spi-s3c64xx.c @@ -245,7 +245,7 @@ static void s3c64xx_flush_fifo(struct s3c64xx_spi_driver_data *sdd) loops = msecs_to_loops(1); do { val = readl(regs + S3C64XX_SPI_STATUS); - } while (TX_FIFO_LVL(val, sdd) && loops--); + } while (TX_FIFO_LVL(val, sdd) && --loops); if (loops == 0) dev_warn(&sdd->pdev->dev, "Timed out flushing TX FIFO\n"); @@ -258,7 +258,7 @@ static void s3c64xx_flush_fifo(struct s3c64xx_spi_driver_data *sdd) readl(regs + S3C64XX_SPI_RX_DATA); else break; - } while (loops--); + } while (--loops); if (loops == 0) dev_warn(&sdd->pdev->dev, "Timed out flushing RX FIFO\n");