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Sun, 24 May 2020 06:02:42 +0000 Received: from mail.zju.edu.cn ([61.164.42.155] helo=zju.edu.cn) by bombadil.infradead.org with esmtp (Exim 4.92.3 #3 (Red Hat Linux)) id 1jcjiY-0004n0-G3 for linux-arm-kernel@lists.infradead.org; Sun, 24 May 2020 06:02:40 +0000 Received: from localhost.localdomain (unknown [222.205.77.158]) by mail-app4 (Coremail) with SMTP id cS_KCgC3nwrwDcpee6wbAg--.17220S4; Sun, 24 May 2020 14:02:27 +0800 (CST) From: Dinghao Liu To: dinghao.liu@zju.edu.cn, kjlu@umn.edu Subject: [PATCH] dmaengine: stm32-dmamux: Fix runtime PM imbalance on error Date: Sun, 24 May 2020 14:02:23 +0800 Message-Id: <20200524060224.16189-1-dinghao.liu@zju.edu.cn> X-Mailer: git-send-email 2.17.1 X-CM-TRANSID: cS_KCgC3nwrwDcpee6wbAg--.17220S4 X-Coremail-Antispam: 1UD129KBjvJXoW7Kw47Zr18AF13Cr1fXrWDArb_yoW8uFW7pr W8tFWFvr4jqaySy3yDJr4kXFZa934fKr97trW8Gwn3Zw45XFyDt3WrJrWj9F18XF95Ar4D Kr17A3yxCF1UuFUanT9S1TB71UUUUUUqnTZGkaVYY2UrUUUUjbIjqfuFe4nvWSU5nxnvy2 9KBjDU0xBIdaVrnRJUUU9l1xkIjI8I6I8E6xAIw20EY4v20xvaj40_Wr0E3s1l1IIY67AE w4v_Jr0_Jr4l8cAvFVAK0II2c7xJM28CjxkF64kEwVA0rcxSw2x7M28EF7xvwVC0I7IYx2 IY67AKxVWDJVCq3wA2z4x0Y4vE2Ix0cI8IcVCY1x0267AKxVW8Jr0_Cr1UM28EF7xvwVC2 z280aVAFwI0_GcCE3s1l84ACjcxK6I8E87Iv6xkF7I0E14v26rxl6s0DM2AIxVAIcxkEcV Aq07x20xvEncxIr21l5I8CrVACY4xI64kE6c02F40Ex7xfMcIj6xIIjxv20xvE14v26r1j 6r18McIj6I8E87Iv67AKxVWUJVW8JwAm72CE4IkC6x0Yz7v_Jr0_Gr1lF7xvr2IYc2Ij64 vIr41lF7I21c0EjII2zVCS5cI20VAGYxC7M4IIrI8v6xkF7I0E8cxan2IY04v7MxkIecxE wVAFwVW8AwCF04k20xvY0x0EwIxGrwCF04k20xvE74AGY7Cv6cx26r4fKr1UJr1l4I8I3I 0E4IkC6x0Yz7v_Jr0_Gr1lx2IqxVAqx4xG67AKxVWUJVWUGwC20s026x8GjcxK67AKxVWU GVWUWwC2zVAF1VAY17CE14v26r1q6r43MIIYrxkI7VAKI48JMIIF0xvE2Ix0cI8IcVAFwI 0_Jr0_JF4lIxAIcVC0I7IYx2IY6xkF7I0E14v26r1j6r4UMIIF0xvE42xK8VAvwI8IcIk0 rVWrJr0_WFyUJwCI42IY6I8E87Iv67AKxVWUJVW8JwCI42IY6I8E87Iv6xkF7I0E14v26r 4j6r4UJbIYCTnIWIevJa73UjIFyTuYvjfUndb1UUUUU X-CM-SenderInfo: qrrzjiaqtzq6lmxovvfxof0/1tbiAgEJBlZdtORShQAbsb X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20200523_230239_262986_9F373ED2 X-CRM114-Status: GOOD ( 10.21 ) X-Spam-Score: -0.0 (/) X-Spam-Report: SpamAssassin version 3.4.4 on bombadil.infradead.org summary: Content analysis details: (-0.0 points) pts rule name description ---- ---------------------- -------------------------------------------------- -0.0 SPF_HELO_PASS SPF: HELO matches SPF record -0.0 SPF_PASS SPF: sender matches SPF record 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: Alexandre Torgue , linux-kernel@vger.kernel.org, Vinod Koul , Maxime Coquelin , dmaengine@vger.kernel.org, Dan Williams , linux-stm32@st-md-mailman.stormreply.com, linux-arm-kernel@lists.infradead.org MIME-Version: 1.0 Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+patchwork-linux-arm=patchwork.kernel.org@lists.infradead.org In stm32_dmamux_route_allocate(), pm_runtime_get_sync() increments the runtime PM usage counter even when it returns an error code. Thus a pairing decrement is needed on the error handling path to keep the counter balanced. In stm32_dmamux_probe(), when platform_get_resource() returns an error code, a pairing runtime PM usage counter decrement is needed to keep the counter balanced. For error paths after this call, things are the same. Signed-off-by: Dinghao Liu --- drivers/dma/stm32-dmamux.c | 8 +++++++- 1 file changed, 7 insertions(+), 1 deletion(-) diff --git a/drivers/dma/stm32-dmamux.c b/drivers/dma/stm32-dmamux.c index 12f7637e13a1..e68e7078ff94 100644 --- a/drivers/dma/stm32-dmamux.c +++ b/drivers/dma/stm32-dmamux.c @@ -139,6 +139,7 @@ static void *stm32_dmamux_route_allocate(struct of_phandle_args *dma_spec, spin_lock_irqsave(&dmamux->lock, flags); ret = pm_runtime_get_sync(&pdev->dev); if (ret < 0) { + pm_runtime_put_noidle(&pdev->dev); spin_unlock_irqrestore(&dmamux->lock, flags); goto error; } @@ -246,8 +247,10 @@ static int stm32_dmamux_probe(struct platform_device *pdev) res = platform_get_resource(pdev, IORESOURCE_MEM, 0); iomem = devm_ioremap_resource(&pdev->dev, res); - if (IS_ERR(iomem)) + if (IS_ERR(iomem)) { + pm_runtime_put_noidle(&pdev->dev); return PTR_ERR(iomem); + } spin_lock_init(&stm32_dmamux->lock); @@ -256,12 +259,14 @@ static int stm32_dmamux_probe(struct platform_device *pdev) ret = PTR_ERR(stm32_dmamux->clk); if (ret != -EPROBE_DEFER) dev_err(&pdev->dev, "Missing clock controller\n"); + pm_runtime_put_noidle(&pdev->dev); return ret; } ret = clk_prepare_enable(stm32_dmamux->clk); if (ret < 0) { dev_err(&pdev->dev, "clk_prep_enable error: %d\n", ret); + pm_runtime_put_noidle(&pdev->dev); return ret; } @@ -300,6 +305,7 @@ static int stm32_dmamux_probe(struct platform_device *pdev) return 0; err_clk: + pm_runtime_put_noidle(&pdev->dev); clk_disable_unprepare(stm32_dmamux->clk); return ret;