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Wysocki" , Danilo Krummrich , Mika Westerberg , Andy Shevchenko , Linus Walleij , Hans de Goede , Ilpo =?utf-8?B?SsOkcnZpbmVu?= , Len Brown , linux-acpi@vger.kernel.org, driver-core@lists.linux.dev, linux-kernel@vger.kernel.org, linux-gpio@vger.kernel.org, platform-driver-x86@vger.kernel.org, brgl@kernel.org Subject: Re: [PATCH v2 1/4] software node: return -ENXIO when referenced swnode is not registered yet Message-ID: References: <20260402-baytrail-real-swnode-v2-0-6f5054a4cc07@oss.qualcomm.com> <20260402-baytrail-real-swnode-v2-1-6f5054a4cc07@oss.qualcomm.com> Precedence: bulk X-Mailing-List: driver-core@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: On Thu, Apr 02, 2026 at 04:35:34PM +0300, Andy Shevchenko wrote: > On Thu, Apr 02, 2026 at 02:54:26PM +0200, Bartosz Golaszewski wrote: > > It's possible that at the time of resolving a reference to a remote > > software node, the node we know exists is not yet registered as a full > > firmware node. We currently return -ENOENT in this case but the same > > error code is also returned in some other cases, like the reference > > property with given name not existing in the property list of the local > > software node. > > > > It makes sense to let users know that we're dealing with an unregistered > > software node so that they can defer probe - the situation is somewhat > > similar to there existing a firmware node to which no device is bound > > yet - which is valid grounds for probe deferral. To that end: use -ENXIO > > which stands for "No such device or address". > > This error code is also too generic to my taste. What about alternative(s)? > EADDRNOTAVAIL > ENOTCONN > > (The brief grep shows that the second one might suit slightly better than the > first one by existing use cases.) We are in the core of the driver core. Why not simply use -EPROBE_DEFER to which all users will resolve this error to and call it a day? Thanks. -- Dmitry