[PATCH -next v2 1/2] pinctrl: ocelot: add missing destroy_workqueue() in error path in ocelot_pinctrl_probe()

[PATCH -next v2 1/2] pinctrl: ocelot: add missing destroy_workqueue() in error path in ocelot_pinctrl_probe()

[Yang Yingliang]

Add the missing destroy_workqueue() before return from ocelot_pinctrl_probe()
in error path.

Fixes: c297561bc98a ("pinctrl: ocelot: Fix interrupt controller")
Signed-off-by: Yang Yingliang <yangyingliang@huawei.com>
---
v2:
  move alloc_ordered_workqueue() after ocelot_pinctrl_register().
---
 drivers/pinctrl/pinctrl-ocelot.c | 12 +++++++-----
 1 file changed, 7 insertions(+), 5 deletions(-)

diff --git a/drivers/pinctrl/pinctrl-ocelot.c b/drivers/pinctrl/pinctrl-ocelot.c
index d9c0184c077f..c672bc2a4df5 100644
--- a/drivers/pinctrl/pinctrl-ocelot.c
+++ b/drivers/pinctrl/pinctrl-ocelot.c
@@ -2065,10 +2065,6 @@ static int ocelot_pinctrl_probe(struct platform_device *pdev)
 	if (!info->desc)
 		return -ENOMEM;
 
-	info->wq = alloc_ordered_workqueue("ocelot_ordered", 0);
-	if (!info->wq)
-		return -ENOMEM;
-
 	info->pincfg_data = &data->pincfg_data;
 
 	reset = devm_reset_control_get_optional_shared(dev, "switch");
@@ -2107,9 +2103,15 @@ static int ocelot_pinctrl_probe(struct platform_device *pdev)
 	if (ret)
 		return ret;
 
+	info->wq = alloc_ordered_workqueue("ocelot_ordered", 0);
+	if (!info->wq)
+		return -ENOMEM;
+
 	ret = ocelot_gpiochip_register(pdev, info);
-	if (ret)
+	if (ret) {
+		destroy_workqueue(info->wq);
 		return ret;
+	}
 
 	dev_info(dev, "driver registered\n");
 
-- 
2.25.1

[PATCH -next v2 2/2] pinctrl: ocelot: Use devm_platform_get_and_ioremap_resource()

[Yang Yingliang]

Switch to use devm_platform_get_and_ioremap_resource() to simplify code.

Signed-off-by: Yang Yingliang <yangyingliang@huawei.com>
---
 drivers/pinctrl/pinctrl-ocelot.c | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/drivers/pinctrl/pinctrl-ocelot.c b/drivers/pinctrl/pinctrl-ocelot.c
index c672bc2a4df5..d2c144611d4b 100644
--- a/drivers/pinctrl/pinctrl-ocelot.c
+++ b/drivers/pinctrl/pinctrl-ocelot.c
@@ -2073,8 +2073,7 @@ static int ocelot_pinctrl_probe(struct platform_device *pdev)
 				     "Failed to get reset\n");
 	reset_control_reset(reset);
 
-	base = devm_ioremap_resource(dev,
-			platform_get_resource(pdev, IORESOURCE_MEM, 0));
+	base = devm_platform_get_and_ioremap_resource(pdev, 0, NULL);
 	if (IS_ERR(base))
 		return PTR_ERR(base);
 
-- 
2.25.1

Re: [PATCH -next v2 1/2] pinctrl: ocelot: add missing destroy_workqueue() in error path in ocelot_pinctrl_probe()

[andy.shevchenko]

Sat, Sep 17, 2022 at 10:46:33AM +0800, Yang Yingliang kirjoitti:
> Add the missing destroy_workqueue() before return from ocelot_pinctrl_probe()
> in error path.
> 
> Fixes: c297561bc98a ("pinctrl: ocelot: Fix interrupt controller")
> Signed-off-by: Yang Yingliang <yangyingliang@huawei.com>
> ---
> v2:
>   move alloc_ordered_workqueue() after ocelot_pinctrl_register().

Why? What will happen if user space start using pins before workqueue is allocated?

If you really want to have it correct, you need either drop all devm_ calls
after allocating workqueue, or wrap destroying into devm.

-- 
With Best Regards,
Andy Shevchenko

Re: [PATCH -next v2 2/2] pinctrl: ocelot: Use devm_platform_get_and_ioremap_resource()

[andy.shevchenko]

Sat, Sep 17, 2022 at 10:46:34AM +0800, Yang Yingliang kirjoitti:
> Switch to use devm_platform_get_and_ioremap_resource() to simplify code.

Reviewed-by: Andy Shevchenko <andy.shevchenko@gmail.com>

> Signed-off-by: Yang Yingliang <yangyingliang@huawei.com>
> ---
>  drivers/pinctrl/pinctrl-ocelot.c | 3 +--
>  1 file changed, 1 insertion(+), 2 deletions(-)
> 
> diff --git a/drivers/pinctrl/pinctrl-ocelot.c b/drivers/pinctrl/pinctrl-ocelot.c
> index c672bc2a4df5..d2c144611d4b 100644
> --- a/drivers/pinctrl/pinctrl-ocelot.c
> +++ b/drivers/pinctrl/pinctrl-ocelot.c
> @@ -2073,8 +2073,7 @@ static int ocelot_pinctrl_probe(struct platform_device *pdev)
>  				     "Failed to get reset\n");
>  	reset_control_reset(reset);
>  
> -	base = devm_ioremap_resource(dev,
> -			platform_get_resource(pdev, IORESOURCE_MEM, 0));
> +	base = devm_platform_get_and_ioremap_resource(pdev, 0, NULL);
>  	if (IS_ERR(base))
>  		return PTR_ERR(base);
>  
> -- 
> 2.25.1
> 
> 

-- 
With Best Regards,
Andy Shevchenko

Re: [PATCH -next v2 1/2] pinctrl: ocelot: add missing destroy_workqueue() in error path in ocelot_pinctrl_probe()

[Yang Yingliang]

Hi,

On 2022/9/17 16:54, andy.shevchenko@gmail.com wrote:
> Sat, Sep 17, 2022 at 10:46:33AM +0800, Yang Yingliang kirjoitti:
>> Add the missing destroy_workqueue() before return from ocelot_pinctrl_probe()
>> in error path.
>>
>> Fixes: c297561bc98a ("pinctrl: ocelot: Fix interrupt controller")
>> Signed-off-by: Yang Yingliang <yangyingliang@huawei.com>
>> ---
>> v2:
>>    move alloc_ordered_workqueue() after ocelot_pinctrl_register().
> Why? What will happen if user space start using pins before workqueue is allocated?
This is a suggestion from Horatiu Vultur.

And I think the workqueue is used in ocelot_irq_unmask_level(), but 
before ocelot_gpiochip_register() calling,
the irq is not prepared, the work won't be queued before 
ocelot_gpiochip_register().
>
> If you really want to have it correct, you need either drop all devm_ calls
> after allocating workqueue, or wrap destroying into devm.
I am trying to add devm APIs for allocating workqueue.

Thanks,
Yang
>

Re: [PATCH -next v2 1/2] pinctrl: ocelot: add missing destroy_workqueue() in error path in ocelot_pinctrl_probe()

[Linus Walleij]

On Sat, Sep 17, 2022 at 4:39 AM Yang Yingliang <yangyingliang@huawei.com> wrote:

> Add the missing destroy_workqueue() before return from ocelot_pinctrl_probe()
> in error path.
>
> Fixes: c297561bc98a ("pinctrl: ocelot: Fix interrupt controller")
> Signed-off-by: Yang Yingliang <yangyingliang@huawei.com>
> ---
> v2:
>   move alloc_ordered_workqueue() after ocelot_pinctrl_register().

Horatiu does this v2 look like you want it? Reviewed-by?

Yours,
Linus Walleij

Re: [PATCH -next v2 1/2] pinctrl: ocelot: add missing destroy_workqueue() in error path in ocelot_pinctrl_probe()

[Horatiu Vultur]

The 10/04/2022 09:09, Linus Walleij wrote:

Hi Linus,

> 
> On Sat, Sep 17, 2022 at 4:39 AM Yang Yingliang <yangyingliang@huawei.com> wrote:
> 
> > Add the missing destroy_workqueue() before return from ocelot_pinctrl_probe()
> > in error path.
> >
> > Fixes: c297561bc98a ("pinctrl: ocelot: Fix interrupt controller")
> > Signed-off-by: Yang Yingliang <yangyingliang@huawei.com>
> > ---
> > v2:
> >   move alloc_ordered_workqueue() after ocelot_pinctrl_register().
> 
> Horatiu does this v2 look like you want it? Reviewed-by?

I have noticed that Yang has sent another version (v3)[1] where he makes
uses of devm_add_action_or_reset.

[1] https://lore.kernel.org/all/20220925021258.1492905-1-yangyingliang@huawei.com/T/

> 
> Yours,
> Linus Walleij

-- 
/Horatiu