linux-kernel - Re: [PATCH v1 1/2] gpiolib: Never return internal error codes to user space

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Date:   Wed, 19 May 2021 10:45:16 +0300
From:   Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
To:     Kent Gibson <warthog618@...il.com>
Cc:     Bartosz Golaszewski <bgolaszewski@...libre.com>,
        linux-gpio@...r.kernel.org, linux-kernel@...r.kernel.org,
        Linus Walleij <linus.walleij@...aro.org>,
        Suresh Balakrishnan <suresh.balakrishnan@...el.com>
Subject: Re: [PATCH v1 1/2] gpiolib: Never return internal error codes to
 user space

On Wed, May 19, 2021 at 07:24:51AM +0800, Kent Gibson wrote:
> On Tue, May 18, 2021 at 06:50:12PM +0300, Andy Shevchenko wrote:
> > Currently it's possible that character device interface may return
> > the error codes which are not supposed to be seen by user space.
> > In this case it's EPROBE_DEFER.
> > 
> > Wrap it to return -ENODEV instead as sysfs does.

> > Fixes: d7c51b47ac11 ("gpio: userspace ABI for reading/writing GPIO lines")
> > Fixes: 61f922db7221 ("gpio: userspace ABI for reading GPIO line events")
> > Fixes: 3c0d9c635ae2 ("gpiolib: cdev: support GPIO_V2_GET_LINE_IOCTL and GPIO_V2_LINE_GET_VALUES_IOCTL")

...

> You immediately revert this patch in patch 2.
> My understanding is that is not allowed within a patch set.

> Why split the patches instead of going direct to the new helper?

It's for backporting to make it easier. (I deliberately left the context above)

I can fold them if maintainers think it's okay to do.


-- 
With Best Regards,
Andy Shevchenko