From patchwork Thu Feb 22 08:21:32 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Anshuman Khandual X-Patchwork-Id: 13566851 Received: from foss.arm.com (foss.arm.com [217.140.110.172]) by smtp.subspace.kernel.org (Postfix) with ESMTP id 5542C1B7F1; Thu, 22 Feb 2024 08:22:07 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=217.140.110.172 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1708590130; cv=none; b=ryvqp77CZOyFeiHcD6Y/5t4o0YZCParB2aJ8fyTpHrqhcsuWbE+ek55wzenfNrER5+pnU9PGT7JNklkjBrFj7WSwETpw8bpAL9F48wxaJMJ9T/uHwtUJoIQKe+/niWQ5hqJXx17rmkrchiAjPkNLpY3YQSTQvSiv2o50cze2XNg= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1708590130; c=relaxed/simple; bh=j8hHo/S0gCbwrJ5q3d/3nGP/2D1CkWfeVaR6rHxNH2s=; h=From:To:Cc:Subject:Date:Message-Id:In-Reply-To:References: MIME-Version; b=H3SuMaT7YebsW2Mye2BtUUaFFVlydngCizIfFOJQ/tvK9iJEUrexOxW0x1Dsc+q2tnWJTEyEcI811qf8yiC3UekkkDSfuwW//Kq3zm2N9AQV8iHhNWq8gKIaMUmC0KjhP2kSohVH0IN0PJazddXrkK3BEvFuIa0XxWZev9nYKHo= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=arm.com; spf=pass smtp.mailfrom=arm.com; arc=none smtp.client-ip=217.140.110.172 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=arm.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=arm.com Received: from usa-sjc-imap-foss1.foss.arm.com (unknown [10.121.207.14]) by usa-sjc-mx-foss1.foss.arm.com (Postfix) with ESMTP id CF0091007; Thu, 22 Feb 2024 00:22:45 -0800 (PST) Received: from a077893.blr.arm.com (a077893.blr.arm.com [10.162.42.8]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPA id D9FEF3F762; Thu, 22 Feb 2024 00:22:01 -0800 (PST) From: Anshuman Khandual To: linux-arm-kernel@lists.infradead.org, suzuki.poulose@arm.com Cc: Anshuman Khandual , Lorenzo Pieralisi , Sudeep Holla , Mike Leach , James Clark , Maxime Coquelin , Alexandre Torgue , linux-acpi@vger.kernel.org, linux-kernel@vger.kernel.org, coresight@lists.linaro.org, linux-stm32@st-md-mailman.stormreply.com, Hanjun Guo , "Rafael J. Wysocki" , Len Brown , Leo Yan Subject: [PATCH V5 01/11] coresight: etm4x: Fix unbalanced pm_runtime_enable() Date: Thu, 22 Feb 2024 13:51:32 +0530 Message-Id: <20240222082142.3663983-2-anshuman.khandual@arm.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20240222082142.3663983-1-anshuman.khandual@arm.com> References: <20240222082142.3663983-1-anshuman.khandual@arm.com> Precedence: bulk X-Mailing-List: linux-acpi@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 There is an unbalanced pm_runtime_enable() in etm4_probe_platform_dev() when etm4_probe() fails. This problem can be observed via the coresight etm4 module's (load -> unload -> load) sequence when etm4_probe() fails in etm4_probe_platform_dev(). [ 63.379943] coresight-etm4x 7040000.etm: Unbalanced pm_runtime_enable! [ 63.393630] coresight-etm4x 7140000.etm: Unbalanced pm_runtime_enable! [ 63.407455] coresight-etm4x 7240000.etm: Unbalanced pm_runtime_enable! [ 63.420983] coresight-etm4x 7340000.etm: Unbalanced pm_runtime_enable! [ 63.420999] coresight-etm4x 7440000.etm: Unbalanced pm_runtime_enable! [ 63.441209] coresight-etm4x 7540000.etm: Unbalanced pm_runtime_enable! [ 63.454689] coresight-etm4x 7640000.etm: Unbalanced pm_runtime_enable! [ 63.474982] coresight-etm4x 7740000.etm: Unbalanced pm_runtime_enable! This fixes the above problem - with an explicit pm_runtime_disable() call when etm4_probe() fails during etm4_probe_platform_dev(). Cc: Lorenzo Pieralisi Cc: Hanjun Guo Cc: Sudeep Holla Cc: "Rafael J. Wysocki" Cc: Len Brown Cc: Suzuki K Poulose Cc: Mike Leach Cc: James Clark Cc: Leo Yan Cc: linux-acpi@vger.kernel.org Cc: linux-arm-kernel@lists.infradead.org Cc: linux-kernel@vger.kernel.org Cc: coresight@lists.linaro.org Fixes: 5214b563588e ("coresight: etm4x: Add support for sysreg only devices") Reviewed-by: James Clark Signed-off-by: Anshuman Khandual --- Changes in V5: - Added "Fixes:" tag drivers/hwtracing/coresight/coresight-etm4x-core.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/drivers/hwtracing/coresight/coresight-etm4x-core.c b/drivers/hwtracing/coresight/coresight-etm4x-core.c index ce1995a2827f..7c693b45ac05 100644 --- a/drivers/hwtracing/coresight/coresight-etm4x-core.c +++ b/drivers/hwtracing/coresight/coresight-etm4x-core.c @@ -2217,6 +2217,9 @@ static int etm4_probe_platform_dev(struct platform_device *pdev) ret = etm4_probe(&pdev->dev); pm_runtime_put(&pdev->dev); + if (ret) + pm_runtime_disable(&pdev->dev); + return ret; }