From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 7A589BA34 for ; Tue, 7 Mar 2023 17:32:01 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 02370C4339B; Tue, 7 Mar 2023 17:32:00 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1678210321; bh=S0IHoom/Ez/Qg5GDkNcK+ovHZifsOmMXa5mxuheiAU4=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=OVFGZSJ8UKYkkWt0ziVb1MH7TotibZkCZlIDmWZDsUfH4x4X0mPF3TDz/pQndsECs t2DPw5d+KEPqW0Tx561lOTMVynyZMcK5lNx5LqYI0CAc/Cjv8FPgZrsNsplsVGNisg Cyi214yjLIiUwlfzM1cf0Mi9sIvnlh7mLorRg2Ek= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Mao Jinlong , James Clark , Suzuki K Poulose , Sasha Levin Subject: [PATCH 6.2 0504/1001] coresight: cti: Add PM runtime call in enable_store Date: Tue, 7 Mar 2023 17:54:36 +0100 Message-Id: <20230307170043.274653082@linuxfoundation.org> X-Mailer: git-send-email 2.39.2 In-Reply-To: <20230307170022.094103862@linuxfoundation.org> References: <20230307170022.094103862@linuxfoundation.org> User-Agent: quilt/0.67 Precedence: bulk X-Mailing-List: patches@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit From: Mao Jinlong [ Upstream commit eff674a9b86a6ffdd10c3af3863545acf7f1ce4f ] In commit 6746eae4bbad ("coresight: cti: Fix hang in cti_disable_hw()") PM runtime calls are removed from cti_enable_hw/cti_disable_hw. When enabling CTI by writing enable sysfs node, clock for accessing CTI register won't be enabled. Device will crash due to register access issue. Add PM runtime call in enable_store to fix this issue. Fixes: 6746eae4bbad ("coresight: cti: Fix hang in cti_disable_hw()") Signed-off-by: Mao Jinlong [Change to only call pm_runtime_put if a disable happened] Tested-by: Jinlong Mao Signed-off-by: James Clark Signed-off-by: Suzuki K Poulose Link: https://lore.kernel.org/r/20230110110736.2709917-3-james.clark@arm.com Signed-off-by: Sasha Levin --- drivers/hwtracing/coresight/coresight-cti-sysfs.c | 13 +++++++++++-- 1 file changed, 11 insertions(+), 2 deletions(-) diff --git a/drivers/hwtracing/coresight/coresight-cti-sysfs.c b/drivers/hwtracing/coresight/coresight-cti-sysfs.c index 6d59c815ecf5e..71e7a8266bb32 100644 --- a/drivers/hwtracing/coresight/coresight-cti-sysfs.c +++ b/drivers/hwtracing/coresight/coresight-cti-sysfs.c @@ -108,10 +108,19 @@ static ssize_t enable_store(struct device *dev, if (ret) return ret; - if (val) + if (val) { + ret = pm_runtime_resume_and_get(dev->parent); + if (ret) + return ret; ret = cti_enable(drvdata->csdev); - else + if (ret) + pm_runtime_put(dev->parent); + } else { ret = cti_disable(drvdata->csdev); + if (!ret) + pm_runtime_put(dev->parent); + } + if (ret) return ret; return size; -- 2.39.2