From mboxrd@z Thu Jan 1 00:00:00 1970 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 vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id AED4BC77B73 for ; Mon, 8 May 2023 11:43:32 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S236282AbjEHLna (ORCPT ); Mon, 8 May 2023 07:43:30 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:38816 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S235862AbjEHLnQ (ORCPT ); Mon, 8 May 2023 07:43:16 -0400 Received: from dfw.source.kernel.org (dfw.source.kernel.org [IPv6:2604:1380:4641:c500::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 6222B4032B for ; Mon, 8 May 2023 04:42:38 -0700 (PDT) Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by dfw.source.kernel.org (Postfix) with ESMTPS id 9937763539 for ; Mon, 8 May 2023 11:42:34 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 9CF0DC433EF; Mon, 8 May 2023 11:42:33 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1683546154; bh=F7CkhW/y20KNo+bmFX2BcQsNQQooq6s0ElqmA5EHTjA=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=hmDdiT5XR1yuWqXAZrHor608gMmB2Brn4oZcdJYI/uWo+eyzfMPI3Xx8t0lNYZNQX auCtJYkoq/+UTtw980pPB0mWYs6zqYN8CjqQu0VDeJPic0qS3G9TQ7cmdX1+8P9PfA DhrNCjq8ZXknD1ePMnYiBL0cqzpL22f/hNdsxz3E= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Shenwei Wang , Sasha Levin Subject: [PATCH 5.15 274/371] tty: serial: fsl_lpuart: adjust buffer length to the intended size Date: Mon, 8 May 2023 11:47:55 +0200 Message-Id: <20230508094822.906916006@linuxfoundation.org> X-Mailer: git-send-email 2.40.1 In-Reply-To: <20230508094811.912279944@linuxfoundation.org> References: <20230508094811.912279944@linuxfoundation.org> User-Agent: quilt/0.67 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: stable@vger.kernel.org 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 5cabc3c85eb1c..00a941db8dcb7 100644 --- a/drivers/tty/serial/fsl_lpuart.c +++ b/drivers/tty/serial/fsl_lpuart.c @@ -1250,7 +1250,7 @@ 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