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Wysocki" , Danilo Krummrich , Rob Herring , Krzysztof Kozlowski , Conor Dooley , Matthias Brugger , AngeloGioacchino Del Regno , linux-acpi@vger.kernel.org, driver-core@lists.linux.dev, linux-pm@vger.kernel.org, linux-usb@vger.kernel.org, devicetree@vger.kernel.org, linux-mediatek@lists.infradead.org, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, Manivannan Sadhasivam , Alan Stern , Bartosz Golaszewski Subject: Re: [PATCH v3 06/13] usb: hub: Pass |struct usb_port*| to usb_port_is_power_on() Message-ID: References: <20260703110317.1283411-1-wenst@chromium.org> <20260703110317.1283411-7-wenst@chromium.org> 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=utf-8 Content-Disposition: inline Content-Transfer-Encoding: 8bit In-Reply-To: Organization: Intel Finland Oy - BIC 0357606-4 - c/o Alberga Business Park, 6 krs, Bertel Jungin Aukio 5, 02600 Espoo On Fri, Jul 03, 2026 at 09:17:16PM +0800, Chen-Yu Tsai wrote: > On Fri, Jul 3, 2026 at 9:11 PM Andy Shevchenko > wrote: > > > > On Fri, Jul 03, 2026 at 07:03:07PM +0800, Chen-Yu Tsai wrote: > > > usb_port_is_power_on() currently takes |struct usb_hub*|, but only needs > > > it to tell if the hub/port is SuperSpeed or not. > > > > > > In a subsequent change, usb_port_is_power_on() needs access to a pwrseq > > > state tracking field in |struct usb_port|. Either structure can be used > > > to identify whether a port/hub is SuperSpeed or not, as the field in > > > |struct usb_port| is inherited from the hub: > > > > > > port->is_superspeed = hub_is_superspeed(hub) > > > > > > Replace usb_port_is_power_on()'s |struct usb_hub*| parameter with > > > |struct usb_port*| so a subsequent change can use it. > > > > At a brief look this will be the only function that takes usb_port > > instead of usb_hub in the entire hub.h (I don't count container_of() > > as a function). With that being said I would rather see it to be moved > > to port.c altogether (yes, it's more invasive change, but looks more > > consistent). I would even dare to move struct usb_port (and container_of() > > accompanied with that) and this function to port.h. This might require > > a separate patch, though. > > I agree with the reasoning, especially given the function name. However > I wonder if it would cause problems given the linking order. I'll give > it a try nevertheless and report back. Thanks! In case it won't fly (but I still think it's better to split), can you at least group usb_port APIs and struct? Means moving the proto closer to that struct usb_port followed by container_of(). > > Perhaps something like: 1) "move struct usb_port and associated APIs to port.h"; > > 2) "...this patch...". -- With Best Regards, Andy Shevchenko