On Thursday 21 August 2008, Greg Kroah-Hartman wrote:
quoted text
> +       if (!class->p) {
> +               WARN(1, "%s called for class '%s' before it was initialized",
> +                    __func__, class->name);
> +               return -EINVAL;
> +       }

Or -- for future reference -- using WARN() with non-constant
initial parameter:

	if (WARN(!class-p, "%s called ...\n" ...))
		return -EINVAL;

Some of those macros now have return values, supportin C code
that looks a bit more compact.

- Dave
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