From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754364AbdKFXeZ (ORCPT ); Mon, 6 Nov 2017 18:34:25 -0500 Received: from shadbolt.e.decadent.org.uk ([88.96.1.126]:51783 "EHLO shadbolt.e.decadent.org.uk" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752881AbdKFXXg (ORCPT ); Mon, 6 Nov 2017 18:23:36 -0500 Content-Type: text/plain; charset="UTF-8" Content-Disposition: inline Content-Transfer-Encoding: 8bit MIME-Version: 1.0 From: Ben Hutchings To: linux-kernel@vger.kernel.org, stable@vger.kernel.org CC: akpm@linux-foundation.org, "Lars-Peter Clausen" , "Mark Brown" , "Tim Gardner" Date: Mon, 06 Nov 2017 23:03:07 +0000 Message-ID: X-Mailer: LinuxStableQueue (scripts by bwh) Subject: [PATCH 3.2 101/147] ASoC: adau1373: adau1373_hw_params: Silence overflow warning In-Reply-To: X-SA-Exim-Connect-IP: 2a02:8011:400e:2:6f00:88c8:c921:d332 X-SA-Exim-Mail-From: ben@decadent.org.uk X-SA-Exim-Scanned: No (on shadbolt.decadent.org.uk); SAEximRunCond expanded to false Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org 3.2.95-rc1 review patch. If anyone has any objections, please let me know. ------------------ From: Tim Gardner commit 14a1b8ca172f4cfbc544051a729d85a380447a82 upstream. ADAU1373_BCLKDIV_SOURCE is defined as BIT(5) which uses UL constants. On amd64 the result of the ones complement operator is then truncated to unsigned int according to the prototype of snd_soc_update_bits(). I think gcc is correctly warning that the upper 32 bits are lost. sound/soc/codecs/adau1373.c: In function 'adau1373_hw_params': sound/soc/codecs/adau1373.c:940:3: warning: large integer implicitly truncated to unsigned type [-Woverflow] gcc version 4.6.3 Add 2 more BCLKDIV mask macros as explained by Lars: The BCLKDIV has three fields. The bitclock divider (bit 0-1), the samplerate (bit 2-4) and the source select (bit 5). Here we want to update the bitclock divider field and the samplerate field. When I wrote the code I was lazy and used ~ADAU1373_BCLKDIV_SOURCE as the mask, which for this register is functionally equivalent to ADAU1373_BCLKDIV_SR_MASK | ADAU1373_BCLKDIV_BCLK_MASK. Signed-off-by: Tim Gardner Acked-by: Lars-Peter Clausen Signed-off-by: Mark Brown Signed-off-by: Ben Hutchings --- sound/soc/codecs/adau1373.c | 5 ++++- 1 file changed, 4 insertions(+), 1 deletion(-) --- a/sound/soc/codecs/adau1373.c +++ b/sound/soc/codecs/adau1373.c @@ -133,6 +133,8 @@ struct adau1373 { #define ADAU1373_DAI_FORMAT_DSP 0x3 #define ADAU1373_BCLKDIV_SOURCE BIT(5) +#define ADAU1373_BCLKDIV_SR_MASK (0x07 << 2) +#define ADAU1373_BCLKDIV_BCLK_MASK 0x03 #define ADAU1373_BCLKDIV_32 0x03 #define ADAU1373_BCLKDIV_64 0x02 #define ADAU1373_BCLKDIV_128 0x01 @@ -937,7 +939,8 @@ static int adau1373_hw_params(struct snd adau1373_dai->enable_src = (div != 0); snd_soc_update_bits(codec, ADAU1373_BCLKDIV(dai->id), - ~ADAU1373_BCLKDIV_SOURCE, (div << 2) | ADAU1373_BCLKDIV_64); + ADAU1373_BCLKDIV_SR_MASK | ADAU1373_BCLKDIV_BCLK_MASK, + (div << 2) | ADAU1373_BCLKDIV_64); switch (params_format(params)) { case SNDRV_PCM_FORMAT_S16_LE: