linux-kernel - RE: [PATCH v1] usb: dwc3: add device put function to decrement the ref-counted reference

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Date:   Fri, 10 Nov 2023 02:43:38 +0000
From:   Stanley Chang[昌育德] 
        <stanley_chang@...ltek.com>
To:     Thinh Nguyen <Thinh.Nguyen@...opsys.com>
CC:     Christophe JAILLET <christophe.jaillet@...adoo.fr>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        "linux-usb@...r.kernel.org" <linux-usb@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: RE: [PATCH v1] usb: dwc3: add device put function to decrement the ref-counted reference



> -----Original Message-----
> From: Thinh Nguyen <Thinh.Nguyen@...opsys.com>
> Sent: Friday, November 10, 2023 10:34 AM
> To: Stanley Chang[昌育德] <stanley_chang@...ltek.com>
> Cc: Thinh Nguyen <Thinh.Nguyen@...opsys.com>; Christophe JAILLET
> <christophe.jaillet@...adoo.fr>; Greg Kroah-Hartman
> <gregkh@...uxfoundation.org>; linux-usb@...r.kernel.org;
> linux-kernel@...r.kernel.org
> Subject: Re: [PATCH v1] usb: dwc3: add device put function to decrement the
> ref-counted reference
> 
> 
> External mail.
> 
> 
> 
> On Tue, Nov 07, 2023, Stanley Chang wrote:
> > When the function exits, the count should be decremented via
> > platform_device_put and of_node_put.
> >
> > Fixes: 34c200483569 ("usb: dwc3: add Realtek DHC RTD SoC dwc3 glue
> > layer driver")
> > Signed-off-by: Stanley Chang <stanley_chang@...ltek.com>
> > ---
> >  drivers/usb/dwc3/dwc3-rtk.c | 3 +++
> >  1 file changed, 3 insertions(+)
> >
> > diff --git a/drivers/usb/dwc3/dwc3-rtk.c b/drivers/usb/dwc3/dwc3-rtk.c
> > index 590028e8fdcb..9d6f2a8bd6ce 100644
> > --- a/drivers/usb/dwc3/dwc3-rtk.c
> > +++ b/drivers/usb/dwc3/dwc3-rtk.c
> > @@ -187,6 +187,7 @@ static enum usb_device_speed
> > __get_dwc3_maximum_speed(struct device_node *np)
> >
> >       ret = match_string(speed_names, ARRAY_SIZE(speed_names),
> > maximum_speed);
> >
> > +     of_node_put(dwc3_np);
> >       return (ret < 0) ? USB_SPEED_UNKNOWN : ret;  }
> >
> > @@ -339,6 +340,8 @@ static int dwc3_rtk_probe_dwc3_core(struct
> > dwc3_rtk *rtk)
> >
> >       switch_usb2_role(rtk, rtk->cur_role);
> >
> > +     platform_device_put(dwc3_pdev);
> 
> Don't you use this after probe? Why put here and not on remove?

I don't use dwc3_pdev in driver.
I use rtk->dwc and dwc is removed by of_platform_depopulate on remove.
So I think I don't need to keep the count of dwc3_pdev.

Thanks,
Stanley

> 
> BR,
> Thinh
> 
> > +     of_node_put(dwc3_node);
> >       return 0;
> >
> >  err_pdev_put:
> > --
> > 2.34.1
> >