Re: [PATCH] cxl: no need to check return value of debugfs_create functions

[Arnd Bergmann <arnd@arndb.de>]

On Tue, Jun 11, 2019 at 8:13 PM Greg Kroah-Hartman
<gregkh@linuxfoundation.org> wrote:

> @@ -64,8 +64,6 @@ int cxl_debugfs_adapter_add(struct cxl *adapter)
>
>         snprintf(buf, 32, "card%i", adapter->adapter_num);
>         dir = debugfs_create_dir(buf, cxl_debugfs);
> -       if (IS_ERR(dir))
> -               return PTR_ERR(dir);
>         adapter->debugfs = dir;
>

Should the check for 'cxl_debugfs' get removed here as well?
If that is null, we might put the subdir in the wrong place in the
tree, but that would otherwise be harmless as well, and the
same thing happens if 'dir' is NULL above and we add the
files in the debugfs root later (losing the ability to clean up
afterwards).

int cxl_debugfs_adapter_add(struct cxl *adapter)
{
        struct dentry *dir;
        char buf[32];

        if (!cxl_debugfs)
                return -ENODEV;

It's still a bit odd to return an error, since the caller then just
ignores the return code anway:

        /* Don't care if this one fails: */
        cxl_debugfs_adapter_add(adapter);

It would seem best to change the return type to 'void' here for
consistency.

     Arnd