linux-kernel - Re: [PATCH v1] mtd: rawnand: Add Macronix NAND read retry support

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Date:   Fri, 10 May 2019 15:37:04 +0200
From:   Thomas Petazzoni <thomas.petazzoni@...tlin.com>
To:     Mason Yang <masonccyang@...c.com.tw>
Cc:     bbrezillon@...nel.org, marek.vasut@...il.com,
        linux-kernel@...r.kernel.org, miquel.raynal@...tlin.com,
        richard@....at, dwmw2@...radead.org, computersforpeace@...il.com,
        linux-mtd@...ts.infradead.org, juliensu@...c.com.tw
Subject: Re: [PATCH v1] mtd: rawnand: Add Macronix NAND read retry support

Hello,

Some purely cosmetic suggestions below.

On Fri, 10 May 2019 15:41:02 +0800
Mason Yang <masonccyang@...c.com.tw> wrote:

> +	if (ret)
> +		pr_err("set feature failed to read retry moded:%d\n", mode);  

I don't know what is the policy in the MTD/NAND subsystem, but
shouldn't you be using dev_err() instead of pr_err() here to have a
nice prefix for the message ?

		dev_err(&nand_to_mtd(chip)->dev, "set feature ..", mode);

> +static void macronix_nand_onfi_init(struct nand_chip *chip)
> +{
> +	struct nand_parameters *p = &chip->parameters;
> +
> +	if (p->onfi) {

Change to:

	if (!p->onfi)
		return;

This way the rest of the function can save one level of indentation.

> +		struct nand_onfi_vendor_macronix *mxic =
> +				(void *)p->onfi->vendor;
> +
> +		if (mxic->reliability_func & MACRONIX_READ_RETRY_BIT) {

Change to:

	if (mxic->reliability_func & MACRONIX_READ_RETRY_BIT == 0)
		return;

And the rest of the function can save one level of indentation.

> +			chip->read_retries = MACRONIX_READ_RETRY_MODE + 1;
> +			chip->setup_read_retry =
> +				 macronix_nand_setup_read_retry;
> +			if (p->supports_set_get_features) {
> +				set_bit(ONFI_FEATURE_ADDR_READ_RETRY,
> +					p->set_feature_list);
> +				set_bit(ONFI_FEATURE_ADDR_READ_RETRY,
> +					p->get_feature_list);
> +			}

Which will require less wrapping in those lines that are already at the
third indentation level.

To me, it is also more logical: we exclude the cases we are not
interested in and return early, and then if we are still in the case we
are interested, we handle it.

Best regards,

Thomas
-- 
Thomas Petazzoni, CTO, Bootlin
Embedded Linux and Kernel engineering
https://bootlin.com