[PATCH] gpio: tegra186: Check PMC driver status before any request

[PATCH] gpio: tegra186: Check PMC driver status before any request

[Prathamesh Shete]

This patch fixes the issue where even if pmc driver
status is disabled still we are invoking pmc driver
to process some request

Signed-off-by: Manish Bhardwaj <mbhardwaj@nvidia.com>
Signed-off-by: Prathamesh Shete <pshete@nvidia.com>
---
 drivers/gpio/gpio-tegra186.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/gpio/gpio-tegra186.c b/drivers/gpio/gpio-tegra186.c
index 54d9fa7da9c1..efd508ba07a6 100644
--- a/drivers/gpio/gpio-tegra186.c
+++ b/drivers/gpio/gpio-tegra186.c
@@ -895,7 +895,7 @@ static int tegra186_gpio_probe(struct platform_device *pdev)
 		tegra186_gpio_init_route_mapping(gpio);
 
 	np = of_find_matching_node(NULL, tegra186_pmc_of_match);
-	if (np) {
+	if (of_device_is_available(np)) {
 		irq->parent_domain = irq_find_host(np);
 		of_node_put(np);
 
-- 
2.17.1

Re: [PATCH] gpio: tegra186: Check PMC driver status before any request

[Thierry Reding]

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On Mon, Sep 12, 2022 at 07:03:09PM +0530, Prathamesh Shete wrote:
> This patch fixes the issue where even if pmc driver
> status is disabled still we are invoking pmc driver
> to process some request

s/pmc/PMC/ twice above. Also, this is slightly misleading. We're not
"invoking" the PMC driver, but rather we're trying to look up the IRQ
domain that the PMC driver would've registered if it had been enabled.
So perhaps reword this to more accurately reflect that.

> 
> Signed-off-by: Manish Bhardwaj <mbhardwaj@nvidia.com>
> Signed-off-by: Prathamesh Shete <pshete@nvidia.com>
> ---
>  drivers/gpio/gpio-tegra186.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/gpio/gpio-tegra186.c b/drivers/gpio/gpio-tegra186.c
> index 54d9fa7da9c1..efd508ba07a6 100644
> --- a/drivers/gpio/gpio-tegra186.c
> +++ b/drivers/gpio/gpio-tegra186.c
> @@ -895,7 +895,7 @@ static int tegra186_gpio_probe(struct platform_device *pdev)
>  		tegra186_gpio_init_route_mapping(gpio);
>  
>  	np = of_find_matching_node(NULL, tegra186_pmc_of_match);
> -	if (np) {
> +	if (of_device_is_available(np)) {
>  		irq->parent_domain = irq_find_host(np);
>  		of_node_put(np);

This now leaks a reference to np if np is found but not available. So
this should be something like:

	if (np) {
		if (of_device_is_available(np)) {
			irq->parent_domain = irq_find_host(np);
			of_node_put(np);

			if (!irq->parent_domain)
				return -EPROBE_DEFER;
		} else {
			of_node_put(np);
		}
	}

or:

	if (np) {
		if (of_device_is_available(np))
			irq->parent_domain = irq_find_host(np);

		of_node_put(np);

		if (of_device_is_available(np) && !irq->parent_domain)
			return -EPROBE_DEFER;
	}

The former is a little nicer because it doesn't check availability
twice.

Thierry

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[PATCH v2] gpio: tegra186: Check PMC driver status before any request

[Prathamesh Shete]

This patch fixes the issue where even if PMC driver status is
disabled still we are trying to look up for the IRQ domain
that PMC driver would've registered if it had been enabled.

Signed-off-by: Manish Bhardwaj <mbhardwaj@nvidia.com>
Signed-off-by: Prathamesh Shete <pshete@nvidia.com>
---
 drivers/gpio/gpio-tegra186.c | 14 +++++++++-----
 1 file changed, 9 insertions(+), 5 deletions(-)

diff --git a/drivers/gpio/gpio-tegra186.c b/drivers/gpio/gpio-tegra186.c
index 54d9fa7da9c1..b99756037ed4 100644
--- a/drivers/gpio/gpio-tegra186.c
+++ b/drivers/gpio/gpio-tegra186.c
@@ -896,11 +896,15 @@ static int tegra186_gpio_probe(struct platform_device *pdev)
 
 	np = of_find_matching_node(NULL, tegra186_pmc_of_match);
 	if (np) {
-		irq->parent_domain = irq_find_host(np);
-		of_node_put(np);
-
-		if (!irq->parent_domain)
-			return -EPROBE_DEFER;
+		if (of_device_is_available(np)) {
+			irq->parent_domain = irq_find_host(np);
+			of_node_put(np);
+
+			if (!irq->parent_domain)
+				return -EPROBE_DEFER;
+		} else {
+			of_node_put(np);
+		}
 	}
 
 	irq->map = devm_kcalloc(&pdev->dev, gpio->gpio.ngpio,
-- 
2.17.1

Re: [PATCH v2] gpio: tegra186: Check PMC driver status before any request

[Linus Walleij]

On Wed, Oct 26, 2022 at 9:06 AM Prathamesh Shete <pshete@nvidia.com> wrote:

> This patch fixes the issue where even if PMC driver status is
> disabled still we are trying to look up for the IRQ domain
> that PMC driver would've registered if it had been enabled.
>
> Signed-off-by: Manish Bhardwaj <mbhardwaj@nvidia.com>
> Signed-off-by: Prathamesh Shete <pshete@nvidia.com>

Reviewed-by: Linus Walleij <linus.walleij@linaro.org>

Yours,
Linus Walleij

Re: [PATCH v2] gpio: tegra186: Check PMC driver status before any request

[Thierry Reding]

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On Wed, Oct 26, 2022 at 12:36:14PM +0530, Prathamesh Shete wrote:
> This patch fixes the issue where even if PMC driver status is
> disabled still we are trying to look up for the IRQ domain
> that PMC driver would've registered if it had been enabled.
> 
> Signed-off-by: Manish Bhardwaj <mbhardwaj@nvidia.com>
> Signed-off-by: Prathamesh Shete <pshete@nvidia.com>
> ---
>  drivers/gpio/gpio-tegra186.c | 14 +++++++++-----
>  1 file changed, 9 insertions(+), 5 deletions(-)

Acked-by: Thierry Reding <treding@nvidia.com>

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Re: [PATCH] gpio: tegra186: Check PMC driver status before any request

[Jon Hunter]

On 06/06/2023 09:53, Jon Hunter wrote:
> 
> On 06/06/2023 08:17, Prathamesh Shete wrote:
>> This patch fixes the issue where even if PMC driver status is
>> disabled still we are trying to look up for the IRQ domain
>> that PMC driver would've registered if it had been enabled.
> 
> It might be clearer to say ...
> 
> When the PMC device is disabled, probing of the Tegra186 GPIO driver 
> fails because the IRQ domain that is registered by the PMC driver is not 
> found. Fix this by checking to see if the PMC device is enabled before 
> attempting to lookup the IRQ domain registered by the PMC.

It could also be worth noting that it is OK to skip the PMC IRQ domain 
in this case because this only impacts wake-ups and not GPIO 
functionality in general.

Jon

-- 
nvpublic

[PATCH v2] gpio: tegra186: Check PMC driver status before any request

[Prathamesh Shete]

When the PMC device is disabled, probing of the Tegra186 GPIO driver
fails because the IRQ domain that is registered by the PMC driver is
not found. The PMC IRQ domain is only used for wake-up and does not
impact GPIO functionality in general. Therefore, if the PMC device is
disabled, skip looking up the PMC IRQ domain to allow the GPIO driver
to be probed.

Signed-off-by: Manish Bhardwaj <mbhardwaj@nvidia.com>
Signed-off-by: Prathamesh Shete <pshete@nvidia.com>
---
 drivers/gpio/gpio-tegra186.c | 14 +++++++++-----
 1 file changed, 9 insertions(+), 5 deletions(-)

diff --git a/drivers/gpio/gpio-tegra186.c b/drivers/gpio/gpio-tegra186.c
index 464b0ea3b6f1..80d08ddde40e 100644
--- a/drivers/gpio/gpio-tegra186.c
+++ b/drivers/gpio/gpio-tegra186.c
@@ -964,11 +964,15 @@ static int tegra186_gpio_probe(struct platform_device *pdev)
 
 	np = of_find_matching_node(NULL, tegra186_pmc_of_match);
 	if (np) {
-		irq->parent_domain = irq_find_host(np);
-		of_node_put(np);
-
-		if (!irq->parent_domain)
-			return -EPROBE_DEFER;
+		if (of_device_is_available(np)) {
+			irq->parent_domain = irq_find_host(np);
+			of_node_put(np);
+
+			if (!irq->parent_domain)
+				return -EPROBE_DEFER;
+		} else {
+			of_node_put(np);
+		}
 	}
 
 	irq->map = devm_kcalloc(&pdev->dev, gpio->gpio.ngpio,
-- 
2.17.1

Re: [PATCH v2] gpio: tegra186: Check PMC driver status before any request

[Jon Hunter]

On 07/06/2023 12:31, Prathamesh Shete wrote:
> When the PMC device is disabled, probing of the Tegra186 GPIO driver
> fails because the IRQ domain that is registered by the PMC driver is
> not found. The PMC IRQ domain is only used for wake-up and does not
> impact GPIO functionality in general. Therefore, if the PMC device is
> disabled, skip looking up the PMC IRQ domain to allow the GPIO driver
> to be probed.
> 
> Signed-off-by: Manish Bhardwaj <mbhardwaj@nvidia.com>
> Signed-off-by: Prathamesh Shete <pshete@nvidia.com>
> ---
>   drivers/gpio/gpio-tegra186.c | 14 +++++++++-----
>   1 file changed, 9 insertions(+), 5 deletions(-)
> 
> diff --git a/drivers/gpio/gpio-tegra186.c b/drivers/gpio/gpio-tegra186.c
> index 464b0ea3b6f1..80d08ddde40e 100644
> --- a/drivers/gpio/gpio-tegra186.c
> +++ b/drivers/gpio/gpio-tegra186.c
> @@ -964,11 +964,15 @@ static int tegra186_gpio_probe(struct platform_device *pdev)
>   
>   	np = of_find_matching_node(NULL, tegra186_pmc_of_match);
>   	if (np) {
> -		irq->parent_domain = irq_find_host(np);
> -		of_node_put(np);
> -
> -		if (!irq->parent_domain)
> -			return -EPROBE_DEFER;
> +		if (of_device_is_available(np)) {
> +			irq->parent_domain = irq_find_host(np);
> +			of_node_put(np);
> +
> +			if (!irq->parent_domain)
> +				return -EPROBE_DEFER;
> +		} else {
> +			of_node_put(np);
> +		}
>   	}
>   
>   	irq->map = devm_kcalloc(&pdev->dev, gpio->gpio.ngpio,

Thanks!

Reviewed-by: Jon Hunter <jonathanh@nvidia.com>

Jon

-- 
nvpublic

Re: [PATCH v2] gpio: tegra186: Check PMC driver status before any request

[Thierry Reding]

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On Wed, Jun 07, 2023 at 05:01:04PM +0530, Prathamesh Shete wrote:
> When the PMC device is disabled, probing of the Tegra186 GPIO driver
> fails because the IRQ domain that is registered by the PMC driver is
> not found. The PMC IRQ domain is only used for wake-up and does not
> impact GPIO functionality in general. Therefore, if the PMC device is
> disabled, skip looking up the PMC IRQ domain to allow the GPIO driver
> to be probed.
> 
> Signed-off-by: Manish Bhardwaj <mbhardwaj@nvidia.com>
> Signed-off-by: Prathamesh Shete <pshete@nvidia.com>
> ---
>  drivers/gpio/gpio-tegra186.c | 14 +++++++++-----
>  1 file changed, 9 insertions(+), 5 deletions(-)

Acked-by: Thierry Reding <treding@nvidia.com>

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