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[160.94.64.2]) by smtp.googlemail.com with ESMTPSA id y2sm158589ilg.69.2020.06.03.11.34.21 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 03 Jun 2020 11:34:21 -0700 (PDT) From: Navid Emamdoost To: Dan Williams , Vinod Koul , Maxime Coquelin , Alexandre Torgue , dmaengine@vger.kernel.org, linux-stm32@st-md-mailman.stormreply.com, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org Subject: [PATCH] engine: stm32-dma: call pm_runtime_put if pm_runtime_get_sync fails Date: Wed, 3 Jun 2020 13:34:10 -0500 Message-Id: <20200603183410.76764-1-navid.emamdoost@gmail.com> X-Mailer: git-send-email 2.17.1 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20200603_113422_842125_ABC737A4 X-CRM114-Status: GOOD ( 11.62 ) 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: Navid Emamdoost , emamd001@umn.edu, kjlu@umn.edu, wu000273@umn.edu, smccaman@umn.edu MIME-Version: 1.0 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 Calling pm_runtime_get_sync increments the counter even in case of failure, causing incorrect ref count. Call pm_runtime_put if pm_runtime_get_sync fails. Signed-off-by: Navid Emamdoost --- drivers/dma/stm32-dma.c | 8 ++++++-- 1 file changed, 6 insertions(+), 2 deletions(-) diff --git a/drivers/dma/stm32-dma.c b/drivers/dma/stm32-dma.c index 0ddbaa4b4f0b..0aab86bd97fe 100644 --- a/drivers/dma/stm32-dma.c +++ b/drivers/dma/stm32-dma.c @@ -1169,8 +1169,10 @@ static int stm32_dma_alloc_chan_resources(struct dma_chan *c) chan->config_init = false; ret = pm_runtime_get_sync(dmadev->ddev.dev); - if (ret < 0) + if (ret < 0) { + pm_runtime_put(dmadev->ddev.dev); return ret; + } ret = stm32_dma_disable_chan(chan); if (ret < 0) @@ -1439,8 +1441,10 @@ static int stm32_dma_suspend(struct device *dev) int id, ret, scr; ret = pm_runtime_get_sync(dev); - if (ret < 0) + if (ret < 0) { + pm_runtime_put_sync(dev); return ret; + } for (id = 0; id < STM32_DMA_MAX_CHANNELS; id++) { scr = stm32_dma_read(dmadev, STM32_DMA_SCR(id)); -- 2.17.1 _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel