From patchwork Fri Jun 18 11:15:54 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Stephan Gerhold X-Patchwork-Id: 12331111 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=-18.8 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER, INCLUDES_PATCH,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED, USER_AGENT_GIT autolearn=unavailable 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 A70F1C48BE8 for ; Fri, 18 Jun 2021 11:17:04 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 8BBA161248 for ; Fri, 18 Jun 2021 11:17:04 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231350AbhFRLTM (ORCPT ); Fri, 18 Jun 2021 07:19:12 -0400 Received: from mo4-p01-ob.smtp.rzone.de ([85.215.255.52]:9544 "EHLO mo4-p01-ob.smtp.rzone.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229523AbhFRLTM (ORCPT ); Fri, 18 Jun 2021 07:19:12 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; t=1624015020; s=strato-dkim-0002; d=gerhold.net; h=Message-Id:Date:Subject:Cc:To:From:Cc:Date:From:Subject:Sender; bh=2IEraGzNWXmVYdeSeEGKrT4Xkx/HJOG80MAY09qwzKU=; b=MhNpCRSVeiykPgc+vZZ4PyWh2hpCLJfiJdRDeHv6NjGfqhrEjC0GVkvPysJ3IQtrP2 z+SvB8yDvmfaqM/eAGzwlwxX6Zd5LLb1vyk2CI46v23FobqKoCPwO1ErzgFSSQym/K3F UECZKSXYM9Qav/Uv8vc286lowUrWOqQj09azCHSy9QGrngNZ7gHS2dFEd3x60UaIPKf2 BBvAij1NWNxvqnyZS+RCb3y1wSw4KhBqoyXdO16FOJrwwLB/rd+ygcr1ETDaj89GpLhV EKMjCu4gWVJtx8J7v+vKiuoQBuVsNTuxZwriEx+pwBqM8d4KAwrysjkVVWZwgOV+0osQ FJvg== Authentication-Results: strato.com; dkim=none X-RZG-AUTH: ":P3gBZUipdd93FF5ZZvYFPugejmSTVR2nRPhVORvLd4SsytBXS7IYBkLahKxA626EOg==" X-RZG-CLASS-ID: mo00 Received: from droid.. by smtp.strato.de (RZmta 47.27.3 DYNA|AUTH) with ESMTPSA id 000885x5IBGx5MN (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256 bits)) (Client did not present a certificate); Fri, 18 Jun 2021 13:16:59 +0200 (CEST) From: Stephan Gerhold To: Bjorn Andersson Cc: Andy Gross , Ohad Ben-Cohen , Mathieu Poirier , linux-arm-msm@vger.kernel.org, linux-remoteproc@vger.kernel.org, ~postmarketos/upstreaming@lists.sr.ht, Stephan Gerhold Subject: [PATCH 1/3] soc: qcom: smem_state: Add devm_qcom_smem_state_get() Date: Fri, 18 Jun 2021 13:15:54 +0200 Message-Id: <20210618111556.53416-1-stephan@gerhold.net> X-Mailer: git-send-email 2.32.0 MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-arm-msm@vger.kernel.org It is easy to forget to call qcom_smem_state_put() after a qcom_smem_state_get(). Introduce a devm_qcom_smem_state_get() helper function that automates this so that qcom_smem_state_put() is automatically called when a device is removed. Signed-off-by: Stephan Gerhold Reviewed-by: Bjorn Andersson --- I use this in my WIP bam-dmux driver, so it might simplify coordination later if we can somehow get this in for 5.14 (if it isn't too late yet). Similar code can be found in clk-devres.c for example: https://elixir.bootlin.com/linux/v5.13-rc6/source/drivers/clk/clk-devres.c#L7 --- drivers/soc/qcom/smem_state.c | 36 +++++++++++++++++++++++++++++ include/linux/soc/qcom/smem_state.h | 7 ++++++ 2 files changed, 43 insertions(+) diff --git a/drivers/soc/qcom/smem_state.c b/drivers/soc/qcom/smem_state.c index d2b558438deb..31faf4aa868e 100644 --- a/drivers/soc/qcom/smem_state.c +++ b/drivers/soc/qcom/smem_state.c @@ -151,6 +151,42 @@ void qcom_smem_state_put(struct qcom_smem_state *state) } EXPORT_SYMBOL_GPL(qcom_smem_state_put); +static void devm_qcom_smem_state_release(struct device *dev, void *res) +{ + qcom_smem_state_put(*(struct qcom_smem_state **)res); +} + +/** + * devm_qcom_smem_state_get() - acquire handle to a devres managed state + * @dev: client device pointer + * @con_id: name of the state to lookup + * @bit: flags from the state reference, indicating which bit's affected + * + * Returns handle to the state, or ERR_PTR(). qcom_smem_state_put() is called + * automatically when @dev is removed. + */ +struct qcom_smem_state *devm_qcom_smem_state_get(struct device *dev, + const char *con_id, + unsigned *bit) +{ + struct qcom_smem_state **ptr, *state; + + ptr = devres_alloc(devm_qcom_smem_state_release, sizeof(*ptr), GFP_KERNEL); + if (!ptr) + return ERR_PTR(-ENOMEM); + + state = qcom_smem_state_get(dev, con_id, bit); + if (!IS_ERR(state)) { + *ptr = state; + devres_add(dev, ptr); + } else { + devres_free(ptr); + } + + return state; +} +EXPORT_SYMBOL_GPL(devm_qcom_smem_state_get); + /** * qcom_smem_state_register() - register a new state * @of_node: of_node used for matching client lookups diff --git a/include/linux/soc/qcom/smem_state.h b/include/linux/soc/qcom/smem_state.h index 63ad8cddad14..17c56a50302f 100644 --- a/include/linux/soc/qcom/smem_state.h +++ b/include/linux/soc/qcom/smem_state.h @@ -14,6 +14,7 @@ struct qcom_smem_state_ops { #ifdef CONFIG_QCOM_SMEM_STATE struct qcom_smem_state *qcom_smem_state_get(struct device *dev, const char *con_id, unsigned *bit); +struct qcom_smem_state *devm_qcom_smem_state_get(struct device *dev, const char *con_id, unsigned *bit); void qcom_smem_state_put(struct qcom_smem_state *); int qcom_smem_state_update_bits(struct qcom_smem_state *state, u32 mask, u32 value); @@ -29,6 +30,12 @@ static inline struct qcom_smem_state *qcom_smem_state_get(struct device *dev, return ERR_PTR(-EINVAL); } +static inline struct qcom_smem_state *devm_qcom_smem_state_get(struct device *dev, + const char *con_id, unsigned *bit) +{ + return ERR_PTR(-EINVAL); +} + static inline void qcom_smem_state_put(struct qcom_smem_state *state) { }