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 X-Spam-Level: X-Spam-Status: No, score=-7.0 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_HELO_NONE, SPF_PASS,URIBL_BLOCKED autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 72937C48BD6 for ; Tue, 25 Jun 2019 20:27:10 +0000 (UTC) Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id 4A635208CB for ; Tue, 25 Jun 2019 20:27:10 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=lists.infradead.org header.i=@lists.infradead.org header.b="IPQy27q5"; dkim=fail reason="signature verification failed" (1024-bit key) header.d=kernel.org header.i=@kernel.org header.b="HGnMUm36" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 4A635208CB Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=kernel.org Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-arm-kernel-bounces+infradead-linux-arm-kernel=archiver.kernel.org@lists.infradead.org DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20170209; h=Sender: Content-Transfer-Encoding:Content-Type:Cc:List-Subscribe:List-Help:List-Post: List-Archive:List-Unsubscribe:List-Id:Message-Id:Date:Subject:From:To: References:In-Reply-To:MIME-Version:Reply-To:Content-ID:Content-Description: Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID: List-Owner; bh=37Prw3uiy9Tw2nq717oSj9edLqthFK5+IZJvenp1zc8=; b=IPQy27q5gqgtlW tIFca/5OrDky8Gr8cZBtVzshSks7rvvivpOakw+cYtDtRRFvbJjY97ddt0LL0ptf0zJn6XtgP1i6k eDZKDAzChDQyN2mU/LY2CmDdsF2ykVgUTVj+fbEpmHK2uasSvpYu4xMs615EPmP6uqIpIVwCs2oUQ l0dZZKsrYLuCEys8/Z/3BKzJPDaj+CZYa27zWY/aWifvI96sUfTa83A7MXC3n50B7eJAzr4sQSkXL S6DdR5qmatWv7E88pGl+jG/S/ujX4yLz4wTd1K7eMZOZ8xKXjMfpdV1CD2CcQUjk0Yy16FieECQzs CeyB5jw12BwzhqF6Shkg==; Received: from localhost ([127.0.0.1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.92 #3 (Red Hat Linux)) id 1hfs21-00020C-Rl; Tue, 25 Jun 2019 20:27:09 +0000 Received: from mail.kernel.org ([198.145.29.99]) by bombadil.infradead.org with esmtps (Exim 4.92 #3 (Red Hat Linux)) id 1hfs1v-0001yB-8L; Tue, 25 Jun 2019 20:27:04 +0000 Received: from kernel.org (unknown [104.132.0.74]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id B9A9B208CB; Tue, 25 Jun 2019 20:27:02 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1561494422; bh=4DjDMXCFMiEPojnFZTh8l0f8w6EVPLy4ezbvE1XggGw=; h=In-Reply-To:References:To:From:Subject:Cc:Date:From; b=HGnMUm36tBd89ZCYMpakSYGFEW5Ra8p8ujQXGTZBj7wplR2/DDy55cLSCmDONvdHY zvRbTWOTcuq+e3106aW7m2laV8C4uUGsBk5uzvJeZKwhWPPPmBSq+savdLyIs9SkPO 50vQuTR/sLQeXqmcCO0A4QBjA4XFwhvT87/QcdKc= MIME-Version: 1.0 In-Reply-To: <20190620150013.13462-6-narmstrong@baylibre.com> References: <20190620150013.13462-1-narmstrong@baylibre.com> <20190620150013.13462-6-narmstrong@baylibre.com> To: Neil Armstrong , jbrunet@baylibre.com, khilman@baylibre.com From: Stephen Boyd Subject: Re: [RFC/RFT 05/14] soc: amlogic: meson-clk-measure: protect measure with a mutex User-Agent: alot/0.8.1 Date: Tue, 25 Jun 2019 13:27:01 -0700 Message-Id: <20190625202702.B9A9B208CB@mail.kernel.org> X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20190625_132703_314974_09C18E43 X-CRM114-Status: GOOD ( 11.39 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Neil Armstrong , martin.blumenstingl@googlemail.com, linux-kernel@vger.kernel.org, linux-amlogic@lists.infradead.org, linux-clk@vger.kernel.org, linux-arm-kernel@lists.infradead.org Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+infradead-linux-arm-kernel=archiver.kernel.org@lists.infradead.org Quoting Neil Armstrong (2019-06-20 08:00:04) > In order to protect clock measuring when multiple process asks for > a mesure, protect the main measure function with mutexes. > > Signed-off-by: Neil Armstrong > --- > drivers/soc/amlogic/meson-clk-measure.c | 12 +++++++++++- > 1 file changed, 11 insertions(+), 1 deletion(-) > > diff --git a/drivers/soc/amlogic/meson-clk-measure.c b/drivers/soc/amlogic/meson-clk-measure.c > index 19d4cbc93a17..c470e24f1dfa 100644 > --- a/drivers/soc/amlogic/meson-clk-measure.c > +++ b/drivers/soc/amlogic/meson-clk-measure.c > @@ -11,6 +11,8 @@ > #include > #include > > +static DEFINE_MUTEX(measure_lock); > + > #define MSR_CLK_DUTY 0x0 > #define MSR_CLK_REG0 0x4 > #define MSR_CLK_REG1 0x8 > @@ -360,6 +362,10 @@ static int meson_measure_id(struct meson_msr_id *clk_msr_id, > unsigned int val; > int ret; > > + ret = mutex_lock_interruptible(&measure_lock); Why interruptible? > + if (ret) > + return ret; > + > regmap_write(priv->regmap, MSR_CLK_REG0, 0); > > /* Set measurement duration */ _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel