linux-kernel - Re: [RFC][PATCH 7/7] MTD: UBI: wire up checkpointing

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Date:	Sun, 19 Feb 2012 15:57:41 +0200
From:	Shmulik Ladkani <shmulik.ladkani@...il.com>
To:	Richard Weinberger <rw@...utronix.de>
Cc:	linux-mtd@...ts.infradead.org, tglx@...utronix.de,
	dedekind1@...il.com, linux-kernel@...r.kernel.org,
	tim.bird@...sony.com
Subject: Re: [RFC][PATCH 7/7] MTD: UBI: wire up checkpointing

On Tue, 14 Feb 2012 21:06:46 +0100 Richard Weinberger <rw@...utronix.de> wrote:
> +#ifdef CONFIG_MTD_UBI_CHECKPOINT
> +static int attach_by_checkpointing(struct ubi_device *ubi)
> +{
> +	int cp_start, err;
> +	struct ubi_scan_info *si;
> +
> +	cp_start = ubi_find_checkpoint(ubi);
> +	if (cp_start < 0)
> +		return -ENOENT;
> +
> +	si = ubi_read_checkpoint(ubi, cp_start);
> +	if (IS_ERR(si))
> +		return PTR_ERR(si);
> +
> +	ubi->bad_peb_count = 0;
> +	ubi->good_peb_count = ubi->peb_count;

Zero reported bad PEBs when checkpointing.
Seems that checkpointing does not remember number/location of bad PEBs.
Are we fine with that?

> +#ifdef CONFIG_MTD_UBI_CHECKPOINT
> +	err = attach_by_checkpointing(ubi);
> +
> +	if (err) {
> +		if (err != -ENOENT)
> +			ubi_msg("falling back to attach by scanning mode!\n");
> +
> +		err = attach_by_scanning(ubi);
> +	}

Code does not fit error message.
Message states "falling back to scanning" only if "err != -ENOENT".
However code calls 'attach_by_scanning' regardless 'err'.
Was it your intention?

Regards,
Shmulik
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