[PATCH v2] spi: tegra20: Fix missing IRQ check in tegra_slink_probe

[PATCH v2] spi: tegra20: Fix missing IRQ check in tegra_slink_probe

[Miaoqian Lin]

This func misses checking for platform_get_irq()'s call and may passes the
negative error codes to request_threaded_irq(), which takes unsigned IRQ #,
causing it to fail with -EINVAL, overriding an original error code.
Stop calling request_threaded_irq() with invalid IRQ #s.

Fixes: e4bb903fda0e ("spi: tegra20-slink: Improve runtime PM usage")
Signed-off-by: Miaoqian Lin <linmq006@gmail.com>
---
Changes in v2:
- fix wrong func name in commit message.
---
 drivers/spi/spi-tegra20-slink.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/drivers/spi/spi-tegra20-slink.c b/drivers/spi/spi-tegra20-slink.c
index 2a03739a0c60..0eea35882777 100644
--- a/drivers/spi/spi-tegra20-slink.c
+++ b/drivers/spi/spi-tegra20-slink.c
@@ -1100,6 +1100,11 @@ static int tegra_slink_probe(struct platform_device *pdev)
 	reset_control_deassert(tspi->rst);
 
 	spi_irq = platform_get_irq(pdev, 0);
+	if (spi_irq < 0) {
+		dev_err(&pdev->dev, "Unable to request IRQ: %d\n", ret);
+		ret = spi_irq;
+		goto exit_pm_put;
+	}
 	tspi->irq = spi_irq;
 	ret = request_threaded_irq(tspi->irq, tegra_slink_isr,
 				   tegra_slink_isr_thread, IRQF_ONESHOT,
-- 
2.17.1

Re: [PATCH v2] spi: tegra20: Fix missing IRQ check in tegra_slink_probe

[Dmitry Osipenko]

28.01.2022 19:18, Miaoqian Lin пишет:
> This func misses checking for platform_get_irq()'s call and may passes the
> negative error codes to request_threaded_irq(), which takes unsigned IRQ #,
> causing it to fail with -EINVAL, overriding an original error code.
> Stop calling request_threaded_irq() with invalid IRQ #s.
> 
> Fixes: e4bb903fda0e ("spi: tegra20-slink: Improve runtime PM usage")

I don't see how this patch is related to e4bb903fda0e. This tag is
incorrect and should be removed.

> Signed-off-by: Miaoqian Lin <linmq006@gmail.com>
> ---
> Changes in v2:
> - fix wrong func name in commit message.
> ---
>  drivers/spi/spi-tegra20-slink.c | 5 +++++
>  1 file changed, 5 insertions(+)
> 
> diff --git a/drivers/spi/spi-tegra20-slink.c b/drivers/spi/spi-tegra20-slink.c
> index 2a03739a0c60..0eea35882777 100644
> --- a/drivers/spi/spi-tegra20-slink.c
> +++ b/drivers/spi/spi-tegra20-slink.c
> @@ -1100,6 +1100,11 @@ static int tegra_slink_probe(struct platform_device *pdev)
>  	reset_control_deassert(tspi->rst);
>  
>  	spi_irq = platform_get_irq(pdev, 0);
> +	if (spi_irq < 0) {
> +		dev_err(&pdev->dev, "Unable to request IRQ: %d\n", ret);

The "ret" isn't assigned to spi_irq in the error message.

Moreover, platform_get_irq() already prints error message [1] by itself.
The duplicated message is unnecessary and should be removed.

[1]
https://elixir.bootlin.com/linux/v5.17-rc1/source/drivers/base/platform.c#L256

[PATCH v3] spi: tegra20: Fix missing IRQ check in tegra_slink_probe

[Miaoqian Lin]

This func misses checking for platform_get_irq()'s call and may passes the
negative error codes to request_threaded_irq(), which takes unsigned IRQ #,
causing it to fail with -EINVAL, overriding an original error code.
Stop calling request_threaded_irq() with invalid IRQ #s.

Fixes: dc4dc3605639 ("spi: tegra: add spi driver for SLINK controller")
Signed-off-by: Miaoqian Lin <linmq006@gmail.com>
---
Changes in v2:
- fix wrong func name in commit message.
Changes in v3:
- fix Fixes tag info.
- remove redundant error message.
---
 drivers/spi/spi-tegra20-slink.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/drivers/spi/spi-tegra20-slink.c b/drivers/spi/spi-tegra20-slink.c
index 2a03739a0c60..f8661963ecba 100644
--- a/drivers/spi/spi-tegra20-slink.c
+++ b/drivers/spi/spi-tegra20-slink.c
@@ -1100,6 +1100,10 @@ static int tegra_slink_probe(struct platform_device *pdev)
 	reset_control_deassert(tspi->rst);
 
 	spi_irq = platform_get_irq(pdev, 0);
+	if (spi_irq < 0) {
+		ret = spi_irq;
+		goto exit_pm_put;
+	}
 	tspi->irq = spi_irq;
 	ret = request_threaded_irq(tspi->irq, tegra_slink_isr,
 				   tegra_slink_isr_thread, IRQF_ONESHOT,
-- 
2.17.1