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Wed, 22 Mar 2023 09:21:18 +0100 Received: from euls16034.sgp.st.com (euls16034.sgp.st.com [10.75.44.20]) by beta.dmz-eu.st.com (STMicroelectronics) with ESMTP id 173F4100038; Wed, 22 Mar 2023 09:21:17 +0100 (CET) Received: from Webmail-eu.st.com (shfdag1node2.st.com [10.75.129.70]) by euls16034.sgp.st.com (STMicroelectronics) with ESMTP id 0FE9B20E1FC; Wed, 22 Mar 2023 09:21:17 +0100 (CET) Received: from [10.201.22.135] (10.201.22.135) by SHFDAG1NODE2.st.com (10.75.129.70) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.2507.17; Wed, 22 Mar 2023 09:21:15 +0100 Message-ID: <104da4a2-a099-666e-b821-e8efe0901ce8@foss.st.com> Date: Wed, 22 Mar 2023 09:21:14 +0100 MIME-Version: 1.0 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:102.0) Gecko/20100101 Thunderbird/102.8.0 Subject: Re: [PATCH 1/5] remoteproc: stm32: Call of_node_put() on iteration error Content-Language: en-US To: Mathieu Poirier CC: , , , , , , , , , , , , , , , References: <20230320221826.2728078-1-mathieu.poirier@linaro.org> <20230320221826.2728078-2-mathieu.poirier@linaro.org> <20230321213250.GB2782856@p14s> From: Arnaud POULIQUEN Organization: STMicroelectronics In-Reply-To: <20230321213250.GB2782856@p14s> X-Originating-IP: [10.201.22.135] X-ClientProxiedBy: SHFCAS1NODE1.st.com (10.75.129.72) To SHFDAG1NODE2.st.com (10.75.129.70) X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.254,Aquarius:18.0.942,Hydra:6.0.573,FMLib:17.11.170.22 definitions=2023-03-21_11,2023-03-21_01,2023-02-09_01 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20230322_012210_591275_83F209A7 X-CRM114-Status: GOOD ( 21.87 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org On 3/21/23 22:32, Mathieu Poirier wrote: > On Tue, Mar 21, 2023 at 10:00:03AM +0100, Arnaud POULIQUEN wrote: >> Hi Mathieu, >> >> On 3/20/23 23:18, Mathieu Poirier wrote: >>> Function of_phandle_iterator_next() calls of_node_put() on the last >>> device_node it iterated over, but when the loop exits prematurely it has >>> to be called explicitly> >>> Fixes: 13140de09cc2 ("remoteproc: stm32: add an ST stm32_rproc driver") >>> Cc: stable@vger.kernel.org >>> Signed-off-by: Mathieu Poirier >>> --- >>> drivers/remoteproc/stm32_rproc.c | 6 +++++- >>> 1 file changed, 5 insertions(+), 1 deletion(-) >>> >>> diff --git a/drivers/remoteproc/stm32_rproc.c b/drivers/remoteproc/stm32_rproc.c >>> index 7d782ed9e589..23c1690b8d73 100644 >>> --- a/drivers/remoteproc/stm32_rproc.c >>> +++ b/drivers/remoteproc/stm32_rproc.c >>> @@ -223,11 +223,13 @@ static int stm32_rproc_prepare(struct rproc *rproc) >>> while (of_phandle_iterator_next(&it) == 0) { >>> rmem = of_reserved_mem_lookup(it.node); >>> if (!rmem) { >>> + of_node_put(it.node); >>> dev_err(dev, "unable to acquire memory-region\n"); >>> return -EINVAL; >>> } >>> >>> if (stm32_rproc_pa_to_da(rproc, rmem->base, &da) < 0) { >>> + of_node_put(it.node); >>> dev_err(dev, "memory region not valid %pa\n", >>> &rmem->base); >>> return -EINVAL; >>> @@ -254,8 +256,10 @@ static int stm32_rproc_prepare(struct rproc *rproc) >>> it.node->name); >>> } >>> >>> - if (!mem) >>> + if (!mem) { >>> + of_node_put(it.node); >>> return -ENOMEM; >>> + } >> >> Good catch! >> >> Looking in code I don't see that we call of_node_put() when we release the >> carveouts. >> Please tell me if I'm wrong but look to me that we should also call of_node_put() >> in mem->release() op, in drivers. >> > > Are you referring to entry->release(), which for stm32 is > stm32_rproc_mem_release(), in rproc_resource_cleanup()? > > If so then no, it is not needed since of_phandle_iterator_next() calls > of_node_put() on the previous device_node with each iteration. > > Otherwise I fail to understand the question and will ask you to clarify. My apologize, I misread the of_phandle_iterator_next function. you can forget my comment. Regards, Arnaud > >> This one remains valid. >> reviewed-by: Arnaud Pouliquen >> > > Ok > >> Thanks, >> Arnaud >> >> >>> >>> rproc_add_carveout(rproc, mem); >>> index++; _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel