linux-kernel - Re: [Patch V1 1/4] memory: tegra: Add support for mc interrupts

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Date:   Wed, 12 Jan 2022 11:13:07 +0300
From:   Dmitry Osipenko <digetx@...il.com>
To:     Ashish Mhetre <amhetre@...dia.com>, thierry.reding@...il.com,
        jonathanh@...dia.com, linux-tegra@...r.kernel.org,
        krzysztof.kozlowski@...onical.com, linux-kernel@...r.kernel.org
Cc:     Snikam@...dia.com, vdumpa@...dia.com
Subject: Re: [Patch V1 1/4] memory: tegra: Add support for mc interrupts

11.01.2022 21:45, Ashish Mhetre пишет:
>  
> @@ -765,16 +768,21 @@ static int tegra_mc_probe(struct platform_device *pdev)
>  			return err;
>  	}
>  
> -	if (mc->soc->ops && mc->soc->ops->handle_irq) {
> +	if (mc->soc->interrupt_ops && mc->soc->interrupt_ops->handle_irq) {
>  		mc->irq = platform_get_irq(pdev, 0);
>  		if (mc->irq < 0)
>  			return mc->irq;
>  
>  		WARN(!mc->soc->client_id_mask, "missing client ID mask for this SoC\n");
>  
> +		/* clear any mc-errs that occurred before. */

s/mc-errs/Memory Controller errors/

> +		if (mc->soc->interrupt_ops->clear_interrupt)
> +			mc->soc->interrupt_ops->clear_interrupt(mc);

There is no explanation of this change neither in the code, nor in the
commit message. Please always provide detailed descriptions for a
non-trivial changes.

Interrupts aren't cleared intentionally by the driver, otherwise you'll
never know about early-boot memory faults which happened before the
probe. Hence this change is incorrect.