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Date: Thu, 15 Feb 2024 17:29:55 +0200
From: Andy Shevchenko <andy@kernel.org>
To: Thomas Richard <thomas.richard@bootlin.com>
Cc: Linus Walleij <linus.walleij@linaro.org>,
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Subject: Re: [PATCH v3 05/18] mux: add mux_chip_resume() function
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References: <20240102-j7200-pcie-s2r-v3-0-5c2e4a3fac1f@bootlin.com>
 <20240102-j7200-pcie-s2r-v3-5-5c2e4a3fac1f@bootlin.com>
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On Thu, Feb 15, 2024 at 04:17:50PM +0100, Thomas Richard wrote:
> The mux_chip_resume() function restores a mux_chip using the cached state
> of each mux.

..

> +int mux_chip_resume(struct mux_chip *mux_chip)
> +{
> +	int global_ret = 0;
> +	int ret, i;
> +
> +	for (i = 0; i < mux_chip->controllers; ++i) {
> +		struct mux_control *mux = &mux_chip->mux[i];
> +
> +		if (mux->cached_state == MUX_CACHE_UNKNOWN)
> +			continue;
> +
> +		ret = mux_control_set(mux, mux->cached_state);
> +		if (ret < 0) {
> +			dev_err(&mux_chip->dev, "unable to restore state\n");
> +			if (!global_ret)
> +				global_ret = ret;

Hmm... This will record the first error and continue.

> +		}
> +	}
> +	return global_ret;

So here, we actually will get stale data in case there are > 1 failures.

> +}

-- 
With Best Regards,
Andy Shevchenko