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[103.229.16.4]) by smtp.gmail.com with ESMTPSA id d2e1a72fcca58-82ca85d4d90sm9379179b3a.36.2026.03.30.06.31.43 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Mon, 30 Mar 2026 06:31:46 -0700 (PDT) Message-ID: Date: Mon, 30 Mar 2026 21:31:42 +0800 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH] coresight: platform: check the availability of the endpoint before parse To: Suzuki K Poulose , Mike Leach , James Clark , Leo Yan , Alexander Shishkin , Tingwei Zhang Cc: coresight@lists.linaro.org, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org References: <20260320-add-availability-check-v1-1-b2e39cdeb6e0@oss.qualcomm.com> <20260320082549.GO8048@e132581.arm.com> <519ca61b-049e-4e2f-a9fc-9b4621574470@oss.qualcomm.com> <20260320092337.GP8048@e132581.arm.com> Content-Language: en-US From: Jie Gan In-Reply-To: <20260320092337.GP8048@e132581.arm.com> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYwMzMwMDEwNSBTYWx0ZWRfX0is6xQnaLjIL 1+ZsbuX1njSq4+8REGNpq7fdv+5bOOp7LfndLYaKKZqsdGwkfXP+0hKyWjpDf6zU7eyuKtGULJz biROpcJ8Wq4zdD3ULsT3NvIRea6plnaXL3+e3OqZSK6vE0LbdGPkTId3RTj37C6rHgVoq3inkO+ uxU1cgs3QQCN++/ZBcyXK9qK9jCgG8oJbzO4W3dZbXWRTFKILaIybYL2XzDG5ywbDOXICsztuYL PilTbC/f8KXVHIa8URMWi3KQXvfaW7s++mO2vh4wd040j+qCm9JZU98I86CWXhk4UPJ9b9YZHWP f+wGNw4+5v/n0cpVHDeJTV8p+8L3RVMou2C6fafyuNSenONKo+dsGl8SDoYEo9KMi+2spggxzlu L89mSH9Z1T/WH1Y0rqZkks51x3Ma5jknsBLRRjJiI/uqj32ehssnynxTLd4WBVoMZ+bzjgXvioB V79ouEtjqZ0p734p9rw== X-Authority-Analysis: v=2.4 cv=aOT9aL9m c=1 sm=1 tr=0 ts=69ca7b44 cx=c_pps a=oF/VQ+ItUULfLr/lQ2/icg==:117 a=nuhDOHQX5FNHPW3J6Bj6AA==:17 a=IkcTkHD0fZMA:10 a=Yq5XynenixoA:10 a=s4-Qcg_JpJYA:10 a=VkNPw1HP01LnGYTKEx00:22 a=u7WPNUs3qKkmUXheDGA7:22 a=_K5XuSEh1TEqbUxoQ0s3:22 a=7CQSdrXTAAAA:8 a=ehGMhPKKDc15LuBkswwA:9 a=QEXdDO2ut3YA:10 a=3WC7DwWrALyhR5TkjVHa:22 a=a-qgeE7W1pNrGK8U0ZQC:22 X-Proofpoint-ORIG-GUID: XC6UQ8kefngpmH7POthczSYailP6yi6u X-Proofpoint-GUID: XC6UQ8kefngpmH7POthczSYailP6yi6u X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1143,Hydra:6.1.51,FMLib:17.12.100.49 definitions=2026-03-29_05,2026-03-28_01,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 impostorscore=0 phishscore=0 bulkscore=0 spamscore=0 lowpriorityscore=0 clxscore=1015 suspectscore=0 adultscore=0 malwarescore=0 priorityscore=1501 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2603050001 definitions=main-2603300105 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20260330_063149_608336_1952CA19 X-CRM114-Status: GOOD ( 19.00 ) 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: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org On 3/20/2026 5:23 PM, Leo Yan wrote: > Hi Jie, > > On Fri, Mar 20, 2026 at 04:44:54PM +0800, Jie Gan wrote: > > [...] > >> It's about the coresight_find_device_by_fwnode() returns NULL, resulting in >> -EPROBE_DEFER. So the probe process will re-start after several seconds, but >> always failed because we have a "disabled" device node in DT(we can see this >> device in DT, but it never becomes available). It's ok if the device only >> has one remote device, but has issue with more than one remote devices. >> >> Consider below situation: >> >> device0 >> | | >> device1 device2(status = "disabled") >> >> The probe of device0 succeeds only when device1 and device2 are available at >> probe time. But I think it's ok to probe the device0 only with device1 >> available. > > Thanks a lot for details. We might need to report warning or error if > all remote endpoints fail (e.g., device1/device2 both are disabled), > this is a rare case so would be low priority. > > For this patch: > > Reviewed-by: Leo Yan Gentle ping. Thanks, Jie