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* [PATCH] rtc: sun6i: Fix memleak in sun6i_rtc_clk_init
@ 2020-08-23  7:58 Dinghao Liu
  2020-08-25 14:51 ` Chen-Yu Tsai
  0 siblings, 1 reply; 5+ messages in thread
From: Dinghao Liu @ 2020-08-23  7:58 UTC (permalink / raw)
  To: dinghao.liu, kjlu
  Cc: Alessandro Zummo, Alexandre Belloni, Maxime Ripard, Chen-Yu Tsai,
	linux-rtc, linux-arm-kernel, linux-kernel

When clk_hw_register_fixed_rate_with_accuracy() fails,
clk_data should be freed. It's the same for the subsequent
error paths.

Signed-off-by: Dinghao Liu <dinghao.liu@zju.edu.cn>
---
 drivers/rtc/rtc-sun6i.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/drivers/rtc/rtc-sun6i.c b/drivers/rtc/rtc-sun6i.c
index e2b8b150bcb4..a837c5a40508 100644
--- a/drivers/rtc/rtc-sun6i.c
+++ b/drivers/rtc/rtc-sun6i.c
@@ -272,7 +272,7 @@ static void __init sun6i_rtc_clk_init(struct device_node *node,
 								300000000);
 	if (IS_ERR(rtc->int_osc)) {
 		pr_crit("Couldn't register the internal oscillator\n");
-		return;
+		goto err;
 	}
 
 	parents[0] = clk_hw_get_name(rtc->int_osc);
@@ -290,7 +290,7 @@ static void __init sun6i_rtc_clk_init(struct device_node *node,
 	rtc->losc = clk_register(NULL, &rtc->hw);
 	if (IS_ERR(rtc->losc)) {
 		pr_crit("Couldn't register the LOSC clock\n");
-		return;
+		goto err;
 	}
 
 	of_property_read_string_index(node, "clock-output-names", 1,
@@ -301,7 +301,7 @@ static void __init sun6i_rtc_clk_init(struct device_node *node,
 					  &rtc->lock);
 	if (IS_ERR(rtc->ext_losc)) {
 		pr_crit("Couldn't register the LOSC external gate\n");
-		return;
+		goto err;
 	}
 
 	clk_data->num = 2;
-- 
2.17.1


^ permalink raw reply	[flat|nested] 5+ messages in thread

* Re: [PATCH] rtc: sun6i: Fix memleak in sun6i_rtc_clk_init
  2020-08-23  7:58 [PATCH] rtc: sun6i: Fix memleak in sun6i_rtc_clk_init Dinghao Liu
@ 2020-08-25 14:51 ` Chen-Yu Tsai
  2020-08-26  8:55   ` dinghao.liu
  0 siblings, 1 reply; 5+ messages in thread
From: Chen-Yu Tsai @ 2020-08-25 14:51 UTC (permalink / raw)
  To: Dinghao Liu
  Cc: Kangjie Lu, linux-rtc, Alessandro Zummo, Alexandre Belloni,
	linux-kernel, Maxime Ripard, linux-arm-kernel

On Sun, Aug 23, 2020 at 3:59 PM Dinghao Liu <dinghao.liu@zju.edu.cn> wrote:
>
> When clk_hw_register_fixed_rate_with_accuracy() fails,
> clk_data should be freed. It's the same for the subsequent
> error paths.

I suppose you should also unregister the already registered clocks
in the latter two error paths?

> Signed-off-by: Dinghao Liu <dinghao.liu@zju.edu.cn>
> ---
>  drivers/rtc/rtc-sun6i.c | 6 +++---
>  1 file changed, 3 insertions(+), 3 deletions(-)
>
> diff --git a/drivers/rtc/rtc-sun6i.c b/drivers/rtc/rtc-sun6i.c
> index e2b8b150bcb4..a837c5a40508 100644
> --- a/drivers/rtc/rtc-sun6i.c
> +++ b/drivers/rtc/rtc-sun6i.c
> @@ -272,7 +272,7 @@ static void __init sun6i_rtc_clk_init(struct device_node *node,
>                                                                 300000000);
>         if (IS_ERR(rtc->int_osc)) {
>                 pr_crit("Couldn't register the internal oscillator\n");
> -               return;
> +               goto err;
>         }
>
>         parents[0] = clk_hw_get_name(rtc->int_osc);
> @@ -290,7 +290,7 @@ static void __init sun6i_rtc_clk_init(struct device_node *node,
>         rtc->losc = clk_register(NULL, &rtc->hw);
>         if (IS_ERR(rtc->losc)) {
>                 pr_crit("Couldn't register the LOSC clock\n");
> -               return;
> +               goto err;
>         }
>
>         of_property_read_string_index(node, "clock-output-names", 1,
> @@ -301,7 +301,7 @@ static void __init sun6i_rtc_clk_init(struct device_node *node,
>                                           &rtc->lock);
>         if (IS_ERR(rtc->ext_losc)) {
>                 pr_crit("Couldn't register the LOSC external gate\n");
> -               return;
> +               goto err;
>         }
>
>         clk_data->num = 2;
> --
> 2.17.1
>
>
> _______________________________________________
> linux-arm-kernel mailing list
> linux-arm-kernel@lists.infradead.org
> http://lists.infradead.org/mailman/listinfo/linux-arm-kernel

^ permalink raw reply	[flat|nested] 5+ messages in thread

* Re: Re: [PATCH] rtc: sun6i: Fix memleak in sun6i_rtc_clk_init
  2020-08-25 14:51 ` Chen-Yu Tsai
@ 2020-08-26  8:55   ` dinghao.liu
  2020-10-09 20:57     ` Alexandre Belloni
  0 siblings, 1 reply; 5+ messages in thread
From: dinghao.liu @ 2020-08-26  8:55 UTC (permalink / raw)
  To: Chen-Yu Tsai
  Cc: Kangjie Lu, linux-rtc, Alessandro Zummo, Alexandre Belloni,
	linux-kernel, Maxime Ripard, linux-arm-kernel

> On Sun, Aug 23, 2020 at 3:59 PM Dinghao Liu <dinghao.liu@zju.edu.cn> wrote:
> >
> > When clk_hw_register_fixed_rate_with_accuracy() fails,
> > clk_data should be freed. It's the same for the subsequent
> > error paths.
> 
> I suppose you should also unregister the already registered clocks
> in the latter two error paths?
> 

Sounds reasonable. But I find that the existing kernel code takes different
strategies for this case. of_sama5d4_sckc_setup() uses clk_hw_unregister() 
after clk_hw_register_fixed_rate_with_accuracy(), while _of_fixed_clk_setup()
uses clk_hw_unregister_fixed_rate(). But at91sam926x_pmc_setup() just does
nothing in this case.

Also, tcon_ch1_setup() uses clk_unregister() after clk_register(), while
clk_register_vco_pll() just does nothing. 

So I'm not sure if we should register here and which unregister function to 
use. Would you please give me more specific advice about this problem?

Regards,
Dinghao

^ permalink raw reply	[flat|nested] 5+ messages in thread

* Re: Re: [PATCH] rtc: sun6i: Fix memleak in sun6i_rtc_clk_init
  2020-08-26  8:55   ` dinghao.liu
@ 2020-10-09 20:57     ` Alexandre Belloni
  2020-10-18  6:00       ` dinghao.liu
  0 siblings, 1 reply; 5+ messages in thread
From: Alexandre Belloni @ 2020-10-09 20:57 UTC (permalink / raw)
  To: dinghao.liu
  Cc: Chen-Yu Tsai, Kangjie Lu, linux-rtc, Alessandro Zummo,
	linux-kernel, Maxime Ripard, linux-arm-kernel

On 26/08/2020 16:55:14+0800, dinghao.liu@zju.edu.cn wrote:
> > On Sun, Aug 23, 2020 at 3:59 PM Dinghao Liu <dinghao.liu@zju.edu.cn> wrote:
> > >
> > > When clk_hw_register_fixed_rate_with_accuracy() fails,
> > > clk_data should be freed. It's the same for the subsequent
> > > error paths.
> > 
> > I suppose you should also unregister the already registered clocks
> > in the latter two error paths?
> > 
> 
> Sounds reasonable. But I find that the existing kernel code takes different
> strategies for this case. of_sama5d4_sckc_setup() uses clk_hw_unregister() 
> after clk_hw_register_fixed_rate_with_accuracy(), while _of_fixed_clk_setup()
> uses clk_hw_unregister_fixed_rate(). But at91sam926x_pmc_setup() just does
> nothing in this case.

I guess you should use clk_hw_unregister_fixed_rate after
clk_hw_register_fixed_rate_with_accuracy. clk_hw_unregister will leak
the struct clk_fixed_rate. It doesn't matter too much for
of_sama5d4_sckc_setup and at91sam926x_pmc_setup because if th clock
can't be registered, the platform will not boot.

> 
> Also, tcon_ch1_setup() uses clk_unregister() after clk_register(), while
> clk_register_vco_pll() just does nothing. 
> 
> So I'm not sure if we should register here and which unregister function to 
> use. Would you please give me more specific advice about this problem?
> 
> Regards,
> Dinghao

-- 
Alexandre Belloni, Bootlin
Embedded Linux and Kernel engineering
https://bootlin.com

^ permalink raw reply	[flat|nested] 5+ messages in thread

* Re: Re: Re: [PATCH] rtc: sun6i: Fix memleak in sun6i_rtc_clk_init
  2020-10-09 20:57     ` Alexandre Belloni
@ 2020-10-18  6:00       ` dinghao.liu
  0 siblings, 0 replies; 5+ messages in thread
From: dinghao.liu @ 2020-10-18  6:00 UTC (permalink / raw)
  To: Alexandre Belloni
  Cc: Chen-Yu Tsai, Kangjie Lu, linux-rtc, Alessandro Zummo,
	linux-kernel, Maxime Ripard, linux-arm-kernel

> On 26/08/2020 16:55:14+0800, dinghao.liu@zju.edu.cn wrote:
> > > On Sun, Aug 23, 2020 at 3:59 PM Dinghao Liu <dinghao.liu@zju.edu.cn> wrote:
> > > >
> > > > When clk_hw_register_fixed_rate_with_accuracy() fails,
> > > > clk_data should be freed. It's the same for the subsequent
> > > > error paths.
> > > 
> > > I suppose you should also unregister the already registered clocks
> > > in the latter two error paths?
> > > 
> > 
> > Sounds reasonable. But I find that the existing kernel code takes different
> > strategies for this case. of_sama5d4_sckc_setup() uses clk_hw_unregister() 
> > after clk_hw_register_fixed_rate_with_accuracy(), while _of_fixed_clk_setup()
> > uses clk_hw_unregister_fixed_rate(). But at91sam926x_pmc_setup() just does
> > nothing in this case.
> 
> I guess you should use clk_hw_unregister_fixed_rate after
> clk_hw_register_fixed_rate_with_accuracy. clk_hw_unregister will leak
> the struct clk_fixed_rate. It doesn't matter too much for
> of_sama5d4_sckc_setup and at91sam926x_pmc_setup because if th clock
> can't be registered, the platform will not boot.

Thank you for your advice! I will submit a new patch soon.

Regards,
Dinghao


^ permalink raw reply	[flat|nested] 5+ messages in thread

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Thread overview: 5+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2020-08-23  7:58 [PATCH] rtc: sun6i: Fix memleak in sun6i_rtc_clk_init Dinghao Liu
2020-08-25 14:51 ` Chen-Yu Tsai
2020-08-26  8:55   ` dinghao.liu
2020-10-09 20:57     ` Alexandre Belloni
2020-10-18  6:00       ` dinghao.liu

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