linux-kernel - Re: [PATCH 1/2] usb: core: Centralize device state update logic

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Message-ID: <CAKzKK0o5vTe-nxE7nBOUqb=Y3dnT_F-KUtOThSe0vXs9-z6gdg@mail.gmail.com>
Date: Tue, 14 Oct 2025 08:06:57 +0800
From: Kuen-Han Tsai <khtsai@...gle.com>
To: Alan Stern <stern@...land.harvard.edu>
Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>, 
	Mathias Nyman <mathias.nyman@...ux.intel.com>, linux-usb@...r.kernel.org, 
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/2] usb: core: Centralize device state update logic

Hi Alan,

On Mon, Oct 13, 2025 at 9:16 PM Alan Stern <stern@...land.harvard.edu> wrote:
>
> On Mon, Oct 13, 2025 at 10:01:22AM +0800, Kuen-Han Tsai wrote:
> > Introduce a new static inline function, update_usb_device_state(), to
> > centralize the process of changing a device's state, including the
> > management of active_duration during suspend/resume transitions.
> >
> > This change prepares for adding tracepoints, allowing tracing logic to
> > be added in a single, central location within the new helper function.
> >
> > Signed-off-by: Kuen-Han Tsai <khtsai@...gle.com>
> > ---
> >  drivers/usb/core/hub.c | 28 ++++++++++++++++------------
> >  1 file changed, 16 insertions(+), 12 deletions(-)
> >
> > diff --git a/drivers/usb/core/hub.c b/drivers/usb/core/hub.c
> > index 256fe8c86828d51c33442345acdb7f3fe80a98ce..ce3d94c960470e9be7979b1021551eab5fd03517 100644
> > --- a/drivers/usb/core/hub.c
> > +++ b/drivers/usb/core/hub.c
> > @@ -2147,6 +2147,20 @@ static void update_port_device_state(struct usb_device *udev)
> >       }
> >  }
> >
> > +static inline void update_usb_device_state(struct usb_device *udev,
> > +                                        enum usb_device_state new_state)
> > +{
> > +     if (udev->state == USB_STATE_SUSPENDED &&
> > +         new_state != USB_STATE_SUSPENDED)
> > +             udev->active_duration -= jiffies;
> > +     else if (new_state == USB_STATE_SUSPENDED &&
> > +              udev->state != USB_STATE_SUSPENDED)
> > +             udev->active_duration += jiffies;
> > +
> > +     udev->state = new_state;
> > +     update_port_device_state(udev);
> > +}
>
> This seems complicated enough to be a standalone function, not inline.
>

Thanks for the suggestion. I will change it into a static void function.

Regards,
Kuen-Han