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Hermes SMTP Server) with ESMTPA ID 84a60f0a442754d82af3c3f91ed8b6cd; Sun, 07 Jun 2026 12:55:13 +0000 (UTC) Message-ID: <617aa489-4f0c-4fe0-8cf3-55c98f4d4d9e@yahoo.com> Date: Sun, 7 Jun 2026 14:55:07 +0200 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [net-next PATCH v13 2/9] net: dsa: realtek: rtl8365mb: reject unsupported topologies To: Luiz Angelo Daros de Luca , Andrew Lunn , Vladimir Oltean , "David S. Miller" , Eric Dumazet , Jakub Kicinski , Paolo Abeni , Simon Horman , Linus Walleij , =?UTF-8?Q?Alvin_=C5=A0ipraga?= , Yury Norov , Rasmus Villemoes , Russell King Cc: netdev@vger.kernel.org, linux-kernel@vger.kernel.org References: <20260606-realtek_forward-v13-0-b9e409687cbe@gmail.com> <20260606-realtek_forward-v13-2-b9e409687cbe@gmail.com> Content-Language: pl From: Mieczyslaw Nalewaj In-Reply-To: <20260606-realtek_forward-v13-2-b9e409687cbe@gmail.com> Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit X-Mailer: WebService/1.1.25918 mail.backend.jedi.jws.acl:role.jedi.acl.token.atz.jws.hermes.yahoo On 6/6/2026 10:29 AM, Luiz Angelo Daros de Luca wrote: > Explicitly enforce the presence of a CPU port (-EINVAL) and reject DSA > cascade links (-EOPNOTSUPP) during setup to prevent silent failures. > > These topologies were already non-functional. Without a CPU port, the > driver does not activate CPU tagging. Additionally, the switch hardware > was not designed to be cascaded, and DSA links never worked because > CPU tagging is not enabled for them. > > Reviewed-by: Mieczyslaw Nalewaj > Reviewed-by: Linus Walleij > Signed-off-by: Luiz Angelo Daros de Luca > --- [...] >drivers/net/dsa/realtek/rtl8365mb.c:rtl8365mb_get_stats64() { > ... > mb = priv->chip_data; > p = &mb->ports[port]; > spin_lock(&p->stats_lock); > memcpy(s, &p->stats, sizeof(*s)); > spin_unlock(&p->stats_lock); >} Sashiko reports a potential deadlock around stats_lock, however I couldn't find a call chain reaching rtl8365mb_get_stats64() from softirq context. Can anyone point to such a path?