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([2001:a61:134c:8401:9dee:c6d3:2820:beac]) by smtp.gmail.com with ESMTPSA id ffacd0b85a97d-42b53e85e6fsm16011805f8f.18.2025.11.15.04.33.55 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Sat, 15 Nov 2025 04:33:55 -0800 (PST) Content-Type: multipart/mixed; boundary="------------nHX7CPgwLi0J9jNmBXoWSU3W" Message-ID: <701e5678-a992-45be-9be3-df68dfe14705@suse.com> Date: Sat, 15 Nov 2025 13:33:48 +0100 Precedence: bulk X-Mailing-List: linux-usb@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: cdc_ncm doesn't detect link unless ethtool is run (ASIX AX88179B) To: WGH , andrew+netdev@lunn.ch, davem@davemloft.net, edumazet@google.com, kuba@kernel.org, pabeni@redhat.com, linux-usb@vger.kernel.org, netdev@vger.kernel.org, Linux Kernel Mailing List References: <1c3f0582-4c92-41b3-a3db-5158661d4e1a@ya.ru> Content-Language: en-US From: Oliver Neukum In-Reply-To: <1c3f0582-4c92-41b3-a3db-5158661d4e1a@ya.ru> This is a multi-part message in MIME format. --------------nHX7CPgwLi0J9jNmBXoWSU3W Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit On 15.11.25 09:58, WGH wrote: > Hello. > > I'm running Linux 6.17.7, and recently obtained a UGREEN 6 in 1 hub containing an AX88179B chip. > > By default, it uses the generic cdc_ncm driver, and it works mostly okay. > > The annoying problem I have is that most of the time the kernel doesn't notice that the link is up. ip link reports NO-CARRIER, network management daemon doesn't configure the interface, and so on. Hi, that strongly points to a race condition. Could you try the attached diagnostic patch? Regards Oliver --------------nHX7CPgwLi0J9jNmBXoWSU3W Content-Type: text/x-patch; charset=UTF-8; name="ncm_bind_uncond.patch" Content-Disposition: attachment; filename="ncm_bind_uncond.patch" Content-Transfer-Encoding: base64 ZGlmZiAtLWdpdCBhL2RyaXZlcnMvbmV0L3VzYi91c2JuZXQuYyBiL2RyaXZlcnMvbmV0L3Vz Yi91c2JuZXQuYwppbmRleCAxZDlmYWE3MGJhM2IuLmQwNDJiYTU3NDIxNyAxMDA2NDQKLS0t IGEvZHJpdmVycy9uZXQvdXNiL3VzYm5ldC5jCisrKyBiL2RyaXZlcnMvbmV0L3VzYi91c2Ju ZXQuYwpAQCAtMTg5Miw3ICsxODkyLDcgQEAgdXNibmV0X3Byb2JlKHN0cnVjdCB1c2JfaW50 ZXJmYWNlICp1ZGV2LCBjb25zdCBzdHJ1Y3QgdXNiX2RldmljZV9pZCAqcHJvZCkKIAogCW5l dGlmX2RldmljZV9hdHRhY2gobmV0KTsKIAotCWlmIChkZXYtPmRyaXZlcl9pbmZvLT5mbGFn cyAmIEZMQUdfTElOS19JTlRSKQorCS8vaWYgKGRldi0+ZHJpdmVyX2luZm8tPmZsYWdzICYg RkxBR19MSU5LX0lOVFIpCiAJCXVzYm5ldF9saW5rX2NoYW5nZShkZXYsIDAsIDApOwogCiAJ cmV0dXJuIDA7Cg== --------------nHX7CPgwLi0J9jNmBXoWSU3W--