[PATCH] Input: lpc32xx-keys - fix invalid error handling of a requested irq

Semantics of NR_IRQS is different on machines with SPARSE_IRQ option
disabled or enabled, in the latter case IRQs are allocated starting
at least from the value specified by NR_IRQS and going upwards, so
the check of (irq >= NR_IRQ) to decide about an error code returned by
platform_get_irq() is completely invalid, don't attempt to overrule
irq subsystem in the driver.

The change fixes lpc32xx_keys driver initialization on boot:

  lpc32xx_keys 40050000.key: failed to get platform irq
  lpc32xx_keys: probe of 40050000.key failed with error -22

Signed-off-by: Vladimir Zapolskiy <vz@mleia.com>
---
 drivers/input/keyboard/lpc32xx-keys.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/input/keyboard/lpc32xx-keys.c b/drivers/input/keyboard/lpc32xx-keys.c
index 265d641..632523d 100644
--- a/drivers/input/keyboard/lpc32xx-keys.c
+++ b/drivers/input/keyboard/lpc32xx-keys.c

@@ -182,7 +182,7 @@ static int lpc32xx_kscan_probe(struct platform_device *pdev)
 	}
 
 	irq = platform_get_irq(pdev, 0);
-	if (irq < 0 || irq >= NR_IRQS) {
+	if (irq < 0) {
 		dev_err(&pdev->dev, "failed to get platform irq\n");
 		return -EINVAL;
 	}

-- 
2.10.2

On Mon, 2016-12-05 at 03:47 +0200, Vladimir Zapolskiy wrote:

Semantics of NR_IRQS is different on machines with SPARSE_IRQ option
disabled or enabled, in the latter case IRQs are allocated starting
at least from the value specified by NR_IRQS and going upwards, so
the check of (irq >= NR_IRQ) to decide about an error code returned by
platform_get_irq() is completely invalid, don't attempt to overrule
irq subsystem in the driver.

The change fixes lpc32xx_keys driver initialization on boot:

  lpc32xx_keys 40050000.key: failed to get platform irq
  lpc32xx_keys: probe of 40050000.key failed with error -22

Signed-off-by: Vladimir Zapolskiy <vz@mleia.com>
---
 drivers/input/keyboard/lpc32xx-keys.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

Cosmetic - please update the subject line when doing the commit:
replace " -" by ":" after lpc32xx-keys

Acked-by: Sylvain Lemieux <redacted>

On December 7, 2016 10:13:07 AM PST, Sylvain Lemieux [off-list ref] wrote:

On Mon, 2016-12-05 at 03:47 +0200, Vladimir Zapolskiy wrote:

quoted

Semantics of NR_IRQS is different on machines with SPARSE_IRQ option
disabled or enabled, in the latter case IRQs are allocated starting
at least from the value specified by NR_IRQS and going upwards, so
the check of (irq >= NR_IRQ) to decide about an error code returned

by

quoted

platform_get_irq() is completely invalid, don't attempt to overrule
irq subsystem in the driver.

The change fixes lpc32xx_keys driver initialization on boot:

  lpc32xx_keys 40050000.key: failed to get platform irq
  lpc32xx_keys: probe of 40050000.key failed with error -22

Signed-off-by: Vladimir Zapolskiy <vz@mleia.com>
---
 drivers/input/keyboard/lpc32xx-keys.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

Cosmetic - please update the subject line when doing the commit:
replace " -" by ":" after lpc32xx-keys

Why? The format on all input patches is "Input: <driver> - <subject>" and had been this for 10+ years.


Thanks.

-- 
Dmitry

On Wed, 2016-12-07 at 10:46 -0800, Dmitry Torokhov wrote:

On December 7, 2016 10:13:07 AM PST, Sylvain Lemieux [off-list ref] wrote:

quoted

On Mon, 2016-12-05 at 03:47 +0200, Vladimir Zapolskiy wrote:

quoted

Semantics of NR_IRQS is different on machines with SPARSE_IRQ option
disabled or enabled, in the latter case IRQs are allocated starting
at least from the value specified by NR_IRQS and going upwards, so
the check of (irq >= NR_IRQ) to decide about an error code returned

by

quoted

platform_get_irq() is completely invalid, don't attempt to overrule
irq subsystem in the driver.

The change fixes lpc32xx_keys driver initialization on boot:

  lpc32xx_keys 40050000.key: failed to get platform irq
  lpc32xx_keys: probe of 40050000.key failed with error -22

Signed-off-by: Vladimir Zapolskiy <vz@mleia.com>
---
 drivers/input/keyboard/lpc32xx-keys.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

Cosmetic - please update the subject line when doing the commit:
replace " -" by ":" after lpc32xx-keys

Why? The format on all input patches is "Input: <driver> - <subject>" and had been this for 10+ years.

My mistake; did not look at the tree "subject line" commit log 

You can dropped my comment.

Regards,
Sylvain

Thanks.

On Wed, Dec 07, 2016 at 01:13:07PM -0500, Sylvain Lemieux wrote:

On Mon, 2016-12-05 at 03:47 +0200, Vladimir Zapolskiy wrote:

quoted

Semantics of NR_IRQS is different on machines with SPARSE_IRQ option
disabled or enabled, in the latter case IRQs are allocated starting
at least from the value specified by NR_IRQS and going upwards, so
the check of (irq >= NR_IRQ) to decide about an error code returned by
platform_get_irq() is completely invalid, don't attempt to overrule
irq subsystem in the driver.

The change fixes lpc32xx_keys driver initialization on boot:

  lpc32xx_keys 40050000.key: failed to get platform irq
  lpc32xx_keys: probe of 40050000.key failed with error -22

Signed-off-by: Vladimir Zapolskiy <vz@mleia.com>
---
 drivers/input/keyboard/lpc32xx-keys.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

Cosmetic - please update the subject line when doing the commit:
replace " -" by ":" after lpc32xx-keys

Acked-by: Sylvain Lemieux <redacted>

Applied, thank you.

-- 
Dmitry