Re: [PATCH] gpio: ftgpio010: Fix platform_get_irq's error checking

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Hi Linus,

On Saturday 02 December 2017 09:00 PM, Linus Walleij wrote:
Hi Arvind,

thanks for the patch!

On Thu, Nov 30, 2017 at 3:12 PM, Arvind Yadav <arvind.yadav.cs@xxxxxxxxx> wrote:

The platform_get_irq() function returns negative if an error occurs.
zero or positive number on success. platform_get_irq() error checking
for zero is not correct.

Signed-off-by: Arvind Yadav <arvind.yadav.cs@xxxxxxxxx>
(...)
         irq = platform_get_irq(pdev, 0);
-       if (!irq)
-               return -EINVAL;
+       if (irq < 0)
+               return irq;
This is wrong.
For an in-depth explanation why irq 0 in not valid, see:
https://lwn.net/Articles/470820/
Thank you for sharing this Articles. It's really helpful.

It should be:

if (irq <= 0)
   return irq ? irq : -EINVAL;

Please update and resubmit. If you have more patches like this,
correct them too.
I will resubmit patch.
Yours,
Linus Walleij
Thanks,
arvind
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