| Message ID | 20231107091252.11783-1-stanley_chang@realtek.com |
|---|---|
| State | New |
| Headers | show |
| Series | [v1] usb: dwc3: add device put function to decrement the ref-counted reference | expand |
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@realtek.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? BR, Thinh > + of_node_put(dwc3_node); > return 0; > > err_pdev_put: > -- > 2.34.1 >
> -----Original Message----- > From: Thinh Nguyen <Thinh.Nguyen@synopsys.com> > Sent: Friday, November 10, 2023 10:34 AM > To: Stanley Chang[昌育德] <stanley_chang@realtek.com> > Cc: Thinh Nguyen <Thinh.Nguyen@synopsys.com>; Christophe JAILLET > <christophe.jaillet@wanadoo.fr>; Greg Kroah-Hartman > <gregkh@linuxfoundation.org>; linux-usb@vger.kernel.org; > linux-kernel@vger.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@realtek.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 > >
On Fri, Nov 10, 2023, Stanley Chang[昌育德] wrote: > > > > -----Original Message----- > > From: Thinh Nguyen <Thinh.Nguyen@synopsys.com> > > Sent: Friday, November 10, 2023 10:34 AM > > To: Stanley Chang[昌育德] <stanley_chang@realtek.com> > > Cc: Thinh Nguyen <Thinh.Nguyen@synopsys.com>; Christophe JAILLET > > <christophe.jaillet@wanadoo.fr>; Greg Kroah-Hartman > > <gregkh@linuxfoundation.org>; linux-usb@vger.kernel.org; > > linux-kernel@vger.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@realtek.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 for the clarification. Acked-by: Thinh Nguyen <Thinh.Nguyen@synopsys.com> BR, Thinh
On Tue, Nov 07, 2023 at 05:12:51PM +0800, Stanley Chang wrote: > When the function exits, the count should be decremented via > platform_device_put and of_node_put. This isn't really a self-contained commit message (and your use of 'count' is too vague). You're also changing two functions in two different ways here. > Fixes: 34c200483569 ("usb: dwc3: add Realtek DHC RTD SoC dwc3 glue layer driver") > Signed-off-by: Stanley Chang <stanley_chang@realtek.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); You're still leaking a reference in the of_property_read_string() error path just above. > 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); > + of_node_put(dwc3_node); Please keep the new line before return for readability. > return 0; > > err_pdev_put: Johan
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); + of_node_put(dwc3_node); return 0; err_pdev_put:
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@realtek.com> --- drivers/usb/dwc3/dwc3-rtk.c | 3 +++ 1 file changed, 3 insertions(+)