From patchwork Tue Aug 23 15:19:40 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Nathan Chancellor X-Patchwork-Id: 599754 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 alsa0.perex.cz (alsa0.perex.cz [77.48.224.243]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id DFA67C32789 for ; Tue, 23 Aug 2022 15:22:27 +0000 (UTC) Received: from alsa1.perex.cz (alsa1.perex.cz [207.180.221.201]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by alsa0.perex.cz (Postfix) with ESMTPS id E956916A2; Tue, 23 Aug 2022 17:21:35 +0200 (CEST) DKIM-Filter: OpenDKIM Filter v2.11.0 alsa0.perex.cz E956916A2 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=alsa-project.org; s=default; t=1661268146; bh=d9e8tVoifQ7GaeXefRpR3cOVTXLtya7HeNbAsuHXZEM=; 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Tue, 23 Aug 2022 15:21:25 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 352D5C433D6; Tue, 23 Aug 2022 15:21:23 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1661268083; bh=d9e8tVoifQ7GaeXefRpR3cOVTXLtya7HeNbAsuHXZEM=; h=From:To:Cc:Subject:Date:From; b=Ufjf5RMzDjXQxSoiSj0waZ14yrHv3F1SyHQq5i6E3xBrhcUfCg2Nk8ZoA1P7evjbn 8AA3yhgGjGrhhLyiwV1qMESJA/SjAkg3GAn2lmh0FY+8xfYwEpYrBnhy+WvsImQowr cP2+wzU0UK0V0wChQtCtLlWwhxXcQ9IybZ+LP5NFdRqKCew/Cb2X0Mf/s1bNsaNOeA qmDyDxSqXbrU6O/h25ErMzoLpSfGQJ12gqh3QvZaGVwRHLteJLyrIpqIEP90WJpJ6X kEl8aQZfWCKpBnudiznNQ/h+s+uOyN38giitazXl1t7LLZDrqKKo98mrnpv/6M6yud 8P0M8EOU56/5g== From: Nathan Chancellor To: Liam Girdwood , Mark Brown , Matt Flax Subject: [PATCH v2] ASoC: codes: src4xxx: Avoid clang -Wsometimes-uninitialized in src4xxx_hw_params() Date: Tue, 23 Aug 2022 08:19:40 -0700 Message-Id: <20220823151939.2493697-1-nathan@kernel.org> X-Mailer: git-send-email 2.37.2 MIME-Version: 1.0 Cc: alsa-devel@alsa-project.org, kernel test robot , Tom Rix , llvm@lists.linux.dev, Nick Desaulniers , linux-kernel@vger.kernel.org, patches@lists.linux.dev, Nathan Chancellor , "Sudip Mukherjee \(Codethink\)" X-BeenThere: alsa-devel@alsa-project.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: "Alsa-devel mailing list for ALSA developers - http://www.alsa-project.org" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: alsa-devel-bounces@alsa-project.org Sender: "Alsa-devel" Clang warns: sound/soc/codecs/src4xxx.c:280:3: error: variable 'd' is used uninitialized whenever switch default is taken [-Werror,-Wsometimes-uninitialized] default: ^~~~~~~ sound/soc/codecs/src4xxx.c:298:59: note: uninitialized use occurs here ret = regmap_write(src4xxx->regmap, SRC4XXX_RCV_PLL_11, d); ^ sound/soc/codecs/src4xxx.c:223:20: note: initialize the variable 'd' to silence this warning int val, pj, jd, d; ^ = 0 sound/soc/codecs/src4xxx.c:280:3: error: variable 'jd' is used uninitialized whenever switch default is taken [-Werror,-Wsometimes-uninitialized] default: ^~~~~~~ sound/soc/codecs/src4xxx.c:293:59: note: uninitialized use occurs here ret = regmap_write(src4xxx->regmap, SRC4XXX_RCV_PLL_10, jd); ^~ sound/soc/codecs/src4xxx.c:223:17: note: initialize the variable 'jd' to silence this warning int val, pj, jd, d; ^ = 0 sound/soc/codecs/src4xxx.c:280:3: error: variable 'pj' is used uninitialized whenever switch default is taken [-Werror,-Wsometimes-uninitialized] default: ^~~~~~~ sound/soc/codecs/src4xxx.c:288:59: note: uninitialized use occurs here ret = regmap_write(src4xxx->regmap, SRC4XXX_RCV_PLL_0F, pj); ^~ sound/soc/codecs/src4xxx.c:223:13: note: initialize the variable 'pj' to silence this warning int val, pj, jd, d; ^ = 0 3 errors generated. The datasheet does not have any default values for these regmap values so pick some arbitrary values and print to the user that this is the case to silence the warnings. Link: https://github.com/ClangBuiltLinux/linux/issues/1691 Reported-by: kernel test robot Reported-by: "Sudip Mukherjee (Codethink)" Suggested-by: Matt Flax Signed-off-by: Nathan Chancellor --- v1 -> v2: https://lore.kernel.org/20220822183101.1115095-1-nathan@kernel.org/ * Don't return early, just initialize the values to some arbitrary numbers and try to hobble along, as other parts of the chip may be functional. * Add message and comment to describe this situation. sound/soc/codecs/src4xxx.c | 7 ++++++- 1 file changed, 6 insertions(+), 1 deletion(-) base-commit: 94f072748337424c9cf92cd018532a34db3a5516 diff --git a/sound/soc/codecs/src4xxx.c b/sound/soc/codecs/src4xxx.c index a8f143057b41..db4e280dd055 100644 --- a/sound/soc/codecs/src4xxx.c +++ b/sound/soc/codecs/src4xxx.c @@ -280,9 +280,14 @@ static int src4xxx_hw_params(struct snd_pcm_substream *substream, default: /* don't error out here, * other parts of the chip are still functional + * Dummy initialize variables to avoid + * -Wsometimes-uninitialized from clang. */ dev_info(component->dev, - "Couldn't set the RCV PLL as this master clock rate is unknown\n"); + "Couldn't set the RCV PLL as this master clock rate is unknown. Chosen regmap values may not match real world values.\n"); + pj = 0x0; + jd = 0xff; + d = 0xff; break; } ret = regmap_write(src4xxx->regmap, SRC4XXX_RCV_PLL_0F, pj);