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 E6201168C5 for ; Mon, 8 May 2023 10:45:17 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 4ABE0C433D2; Mon, 8 May 2023 10:45:17 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1683542717; bh=xXyawMLwL68A0x2ZNuMJtzwfZUtqoT/N1mc/o66Qu9o=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=vI6JXrwEA3khq9O049ax9Z2AdK0qxBNZvhA4wCBuN9guuU/6egTnGRf82NQLwOYZv eDh5pYZm45idoHv1ltQU5ZBUdt+dHDEPuEXNYclRODLpVsdN7ftyPcP19V1OOfRGtQ PkLv0paZwYn4RUoz2rXbk3OeZOVUTYkLUJTynouE= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Shenwei Wang , Sasha Levin Subject: [PATCH 6.2 494/663] tty: serial: fsl_lpuart: adjust buffer length to the intended size Date: Mon, 8 May 2023 11:45:20 +0200 Message-Id: <20230508094444.472641311@linuxfoundation.org> X-Mailer: git-send-email 2.40.1 In-Reply-To: <20230508094428.384831245@linuxfoundation.org> References: <20230508094428.384831245@linuxfoundation.org> User-Agent: quilt/0.67 Precedence: bulk X-Mailing-List: patches@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit From: Shenwei Wang [ Upstream commit f73fd750552524b06b5d77ebfdd106ccc8fcac61 ] Based on the fls function definition provided below, we should not subtract 1 to obtain the correct buffer length: fls(0) = 0, fls(1) = 1, fls(0x80000000) = 32. Fixes: 5887ad43ee02 ("tty: serial: fsl_lpuart: Use cyclic DMA for Rx") Signed-off-by: Shenwei Wang Link: https://lore.kernel.org/r/20230410195555.1003900-1-shenwei.wang@nxp.com Signed-off-by: Greg Kroah-Hartman Signed-off-by: Sasha Levin --- drivers/tty/serial/fsl_lpuart.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/tty/serial/fsl_lpuart.c b/drivers/tty/serial/fsl_lpuart.c index 59c10bceebbef..29b50a0792dcf 100644 --- a/drivers/tty/serial/fsl_lpuart.c +++ b/drivers/tty/serial/fsl_lpuart.c @@ -1270,7 +1270,7 @@ static inline int lpuart_start_rx_dma(struct lpuart_port *sport) * 10ms at any baud rate. */ sport->rx_dma_rng_buf_len = (DMA_RX_TIMEOUT * baud / bits / 1000) * 2; - sport->rx_dma_rng_buf_len = (1 << (fls(sport->rx_dma_rng_buf_len) - 1)); + sport->rx_dma_rng_buf_len = (1 << fls(sport->rx_dma_rng_buf_len)); if (sport->rx_dma_rng_buf_len < 16) sport->rx_dma_rng_buf_len = 16; -- 2.39.2