Re: [PATCH] staging: axis-fifo: Fix three real issues

[Dan Carpenter]

On Fri, Oct 23, 2026 at 05:52:00AM -0300, Breno Rodrigues Alves wrote:
> Hi Greg,
> 
> You are right, and I apologize for the noise.  No tool told me this -
> it was my own reasoning.  I had the (outdated) impression that passing
> an ERR_PTR parent from debugfs_create_dir() to debugfs_create_file()
> would trigger a WARN in the debugfs core.  That was true years ago, but
> modern debugfs handles ERR_PTR parents gracefully, and I should have
> verified the claim on a CONFIG_DEBUG_FS=n kernel before sending the
> patch.

It's been quite that way for quite a while.  Since Jan 2019.

> 
> The other two changes are independent of that assumption:
> 
>   - the -EINVAL -> -ENOBUFS change in axis_fifo_read(), which changes
>     the errno returned when the user buffer is smaller than the
>     available data;

I would argue that -EINVAL is the most common error code in this
situation.  I would accept other returns as well.  As a reviewer I
would probably leave this up to the author.

> 
>   - the removal of the unused 'struct resource *r_mem' local.

This is fine as a cleanup.

regards,
dan carpenter