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: 830980 Received: from imap5.colo.codethink.co.uk (imap5.colo.codethink.co.uk [78.40.148.171]) (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 C8AA21E505; Tue, 24 Sep 2024 13:40:19 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=78.40.148.171 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1727185222; cv=none; b=SozSCzv/iUktLuF5oTSIxqtiP5NQoHYFT4+fDslLrPurK85fH2SAFkIZPqjYpnWv5YOIPtgb71gj/uLocv6nYXdPZ+BEoqjlnvN4AKg8bgrI/u+uaHG2zOFxWgJ1S/kyqQGeumNA8S4G7lTtUgy/UwfdUDdHm9PW1WHsZi2gB5Q= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1727185222; c=relaxed/simple; bh=1EN5pN+OaMzjvva2ElQGivllGskZlYeNnbvkbiNDCGE=; h=From:To:Cc:Subject:Date:Message-Id:In-Reply-To:References: MIME-Version; b=HQnNpUZmtniE+hX0FcUR5GaKRQnBf5ccZ5ngp52NAASh/GWQi4Bogww+wQhBOlfqApv5AnmbI1GXrlbQaiI9HruRD8+5OE7Y8w436j3geQBCQmaVa9FcvgLHH8lJ2uptAK73taPz51NsMLqT4g2rKFvZZVG3qeDE4pqsSPCQWWc= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=codethink.co.uk; spf=pass smtp.mailfrom=codethink.com; dkim=pass (2048-bit key) header.d=codethink.co.uk header.i=@codethink.co.uk header.b=dscdQn5n; arc=none smtp.client-ip=78.40.148.171 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=codethink.co.uk Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=codethink.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=codethink.co.uk header.i=@codethink.co.uk header.b="dscdQn5n" 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> Precedence: bulk X-Mailing-List: linux-samsung-soc@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Sender: srv_ts003@codethink.com 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 Reviewed-by: Andi Shyti --- 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");