linux-kernel - Re: [PATCH v2 2/2] staging: pi433: add debugfs interface

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Message-ID: <YfE4d4UY1yIVvapC@kroah.com>
Date:   Wed, 26 Jan 2022 13:03:03 +0100
From:   Greg KH <gregkh@...uxfoundation.org>
To:     Paulo Miguel Almeida <paulo.miguel.almeida.rodenas@...il.com>
Cc:     realwakka@...il.com, linux-staging@...ts.linux.dev,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 2/2] staging: pi433: add debugfs interface

On Mon, Jan 24, 2022 at 05:27:21PM +1300, Paulo Miguel Almeida wrote:
> This adds debugfs interface that can be used for debugging possible
> hardware/software issues.
> 
> It currently exposes the following debugfs entries for each SPI device
> probed:
> 
>   /sys/kernel/debug/pi433/<DEVICE>/regs
>   ...
> 
> The 'regs' file contains all rf69 uC registers values that are useful
> for troubleshooting misconfigurations between 2 devices. It contains one
> register per line so it should be easy to use normal filtering tools to
> find the registers of interest if needed.
> 
> Signed-off-by: Paulo Miguel Almeida <paulo.miguel.almeida.rodenas@...il.com>
> ---
>  drivers/staging/pi433/pi433_if.c | 80 ++++++++++++++++++++++++++++++++
>  drivers/staging/pi433/rf69.c     |  2 +-
>  drivers/staging/pi433/rf69.h     |  1 +
>  3 files changed, 82 insertions(+), 1 deletion(-)

Breaks the build:

drivers/staging/pi433/pi433_if.c:1166:25: error: initialization of ‘int (*)(struct inode *, struct file *)’ from incompatible pointer type ‘ssize_t (*)(struct inode *, struct file *)’ {aka ‘long int (*)(struct inode *, struct file *)’} [-Werror=incompatible-pointer-types]
 1166 |         .open =         pi433_debugfs_regs_open,
      |                         ^~~~~~~~~~~~~~~~~~~~~~~