linux-kernel - Re: [PATCH 2/2] virt: vmgenid: add support for generation counter

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Date:   Wed, 3 Aug 2022 17:31:47 +0200
From:   Greg KH <gregkh@...uxfoundation.org>
To:     bchalios@...zon.es
Cc:     linux-kernel@...r.kernel.org, tytso@....edu, Jason@...c4.com,
        dwmw@...zon.co.uk, graf@...zon.de, xmarcalx@...zon.co.uk
Subject: Re: [PATCH 2/2] virt: vmgenid: add support for generation counter

On Wed, Aug 03, 2022 at 05:21:27PM +0200, bchalios@...zon.es wrote:
> +	/* Backwards compatibility. If CTRA is not there we just don't expose
> +	 * the char device

Backwards compatibility with what?

> +	 */
> +	ret = parse_vmgenid_address(device, "CTRA", &state->gen_cntr_addr);
> +	if (ret)
> +		return 0;
> +
> +	state->next_counter = devm_memremap(&device->dev, state->gen_cntr_addr,
> +			sizeof(u32), MEMREMAP_WB);
> +	if (IS_ERR(state->next_counter))
> +		return 0;

This too is an error, you can not return with "all is good", right?
Once you try to create this device because the address is present, you
can't just give up and succeed no matter what went wrong, that seems
incorrect.

thanks,

greg k-h