From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (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 34F8B199FB0; Sun, 24 Nov 2024 12:49:22 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1732452563; cv=none; b=RFzfsMmBDSrYgxDHa9+dL+fxDznizIc/XfN67DhSksLnwEcbxhJoxI4Bq1hzqq0bODPit48oLoMbrFFk4JYKSR+LbATFHVuxKMOnnxNw/yDsjurM/EdqsIjalI30BdUdKQBOdUUsMR4dVEBhzQA6RI7K2QTHU2Wq8ipf3vOciic= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1732452563; c=relaxed/simple; bh=r9UHBgJlSBenZzEj8ZbrIVDOfkVGTV/88zxZVPmAKaA=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=ixshR+zKWuJSJnBxAS2lnQbyhDkrNvCYtC3XANsGVES2LDYp8fx132XyFX6Hg9sf+V9GOKF78MXJFQOET2I1uzEQ8xuMgzXhd1RRtg2dT4AQeitm0pfs3JuGiXJxnZ5en1pmiXU2lybG99Zppd0bTWyUwSSA/41o3f+OQGUlxOI= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=JAxe+wED; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="JAxe+wED" Received: by smtp.kernel.org (Postfix) with ESMTPSA id CEFB2C4CED1; Sun, 24 Nov 2024 12:49:21 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1732452562; bh=r9UHBgJlSBenZzEj8ZbrIVDOfkVGTV/88zxZVPmAKaA=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=JAxe+wEDLRGgkjcaAYL/Fk94TC/PLpn36+MX9nI2/0OHyamEbjba/+Y2Feq73Pm7a 0AJdIbedLlUS37KKPSEBdq2h9DBHGcjzM/yUwRo/rJLb19aoHZYpcw72+VJH8wHAu6 bkOxIaRBf6rUoNaNxIv8M+IISpdWR7vgAjLmVW0MTYcfw0/8QREwrzgNyHVjR3U5Ww 2j6yjPHrfYIUXGMUxmgk5mUiu4GV1bKTq1UozFXY5jaHOkanuZn3zAU9XaszUL+gkw +snlmrqOdTYTkv4PJuw1stAaWMC3CNY7NlcdyPZVJfi0h2TBQb6wwk5nwtnnbk0kQK bB4ab9viJSrOg== From: Sasha Levin To: linux-kernel@vger.kernel.org, stable@vger.kernel.org Cc: Stefan Wahren , Frank Li , Mark Brown , Sasha Levin , linux-spi@vger.kernel.org, imx@lists.linux.dev Subject: [PATCH AUTOSEL 6.12 02/23] spi: spi-fsl-lpspi: Adjust type of scldiv Date: Sun, 24 Nov 2024 07:48:13 -0500 Message-ID: <20241124124919.3338752-2-sashal@kernel.org> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20241124124919.3338752-1-sashal@kernel.org> References: <20241124124919.3338752-1-sashal@kernel.org> Precedence: bulk X-Mailing-List: imx@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-stable: review X-Patchwork-Hint: Ignore X-stable-base: Linux 6.12.1 Content-Transfer-Encoding: 8bit From: Stefan Wahren [ Upstream commit fa8ecda9876ac1e7b29257aa82af1fd0695496e2 ] The target value of scldiv is just a byte, but its calculation in fsl_lpspi_set_bitrate could be negative. So use an adequate type to store the result and avoid overflows. After that this needs range check adjustments, but this should make the code less opaque. Signed-off-by: Stefan Wahren Reviewed-by: Frank Li Link: https://patch.msgid.link/20240930093056.93418-2-wahrenst@gmx.net Signed-off-by: Mark Brown Signed-off-by: Sasha Levin --- drivers/spi/spi-fsl-lpspi.c | 7 ++++--- 1 file changed, 4 insertions(+), 3 deletions(-) diff --git a/drivers/spi/spi-fsl-lpspi.c b/drivers/spi/spi-fsl-lpspi.c index 977e8b55c82b7..196cc68f2057b 100644 --- a/drivers/spi/spi-fsl-lpspi.c +++ b/drivers/spi/spi-fsl-lpspi.c @@ -315,9 +315,10 @@ static void fsl_lpspi_set_watermark(struct fsl_lpspi_data *fsl_lpspi) static int fsl_lpspi_set_bitrate(struct fsl_lpspi_data *fsl_lpspi) { struct lpspi_config config = fsl_lpspi->config; - unsigned int perclk_rate, scldiv, div; + unsigned int perclk_rate, div; u8 prescale_max; u8 prescale; + int scldiv; perclk_rate = clk_get_rate(fsl_lpspi->clk_per); prescale_max = fsl_lpspi->devtype_data->prescale_max; @@ -338,13 +339,13 @@ static int fsl_lpspi_set_bitrate(struct fsl_lpspi_data *fsl_lpspi) for (prescale = 0; prescale <= prescale_max; prescale++) { scldiv = div / (1 << prescale) - 2; - if (scldiv < 256) { + if (scldiv >= 0 && scldiv < 256) { fsl_lpspi->config.prescale = prescale; break; } } - if (scldiv >= 256) + if (scldiv < 0 || scldiv >= 256) return -EINVAL; writel(scldiv | (scldiv << 8) | ((scldiv >> 1) << 16), -- 2.43.0