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[2001:b011:3815:12c7:62cc:9df5:f950:3a6d]) by smtp.gmail.com with ESMTPSA id 207-20020a6305d8000000b0043be00f867fsm1936963pgf.60.2022.09.30.10.36.53 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 30 Sep 2022 10:36:54 -0700 (PDT) From: Koba Ko To: Vinod Koul , dmaengine@vger.kernel.org, linux-kernel@vger.kernel.org, Jerry Snitselaar , Jie Hai , Dave Jiang Subject: [PATCH V2] dmaengine: Fix client_count is countered one more incorrectly. Date: Sat, 1 Oct 2022 01:36:52 +0800 Message-Id: <20220930173652.1251349-1-koba.ko@canonical.com> X-Mailer: git-send-email 2.34.1 MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Type: text/plain; charset="utf-8" If the passed client_count is 0, it would be incremented by balance_ref_count first then increment one more. This would cause client_count to 2. cat /sys/class/dma/dma0chan*/in_use 2 2 2 Fixes: d2f4f99db3e9 ("dmaengine: Rework dma_chan_get") Signed-off-by: Koba Ko Reviewed-by: Jie Hai Test-by: Jie Hai Reviewed-by: Jerry Snitselaar Reviewed-by: Dave Jiang Reviewed-by: Joel Savitz Tested-by: Joel Savitz --- V2: Remove [3/3] on subject. --- drivers/dma/dmaengine.c | 7 ++++--- 1 file changed, 4 insertions(+), 3 deletions(-) diff --git a/drivers/dma/dmaengine.c b/drivers/dma/dmaengine.c index 2cfa8458b51be..78f8a9f3ad825 100644 --- a/drivers/dma/dmaengine.c +++ b/drivers/dma/dmaengine.c @@ -451,7 +451,8 @@ static int dma_chan_get(struct dma_chan *chan) /* The channel is already in use, update client count */ if (chan->client_count) { __module_get(owner); - goto out; + chan->client_count++; + return 0; } =20 if (!try_module_get(owner)) @@ -470,11 +471,11 @@ static int dma_chan_get(struct dma_chan *chan) goto err_out; } =20 + chan->client_count++; + if (!dma_has_cap(DMA_PRIVATE, chan->device->cap_mask)) balance_ref_count(chan); =20 -out: - chan->client_count++; return 0; =20 err_out: --=20 2.25.1