linux-kernel - Re: [RFC/PATCH 1/5] mtd: ubi: Read disturb infrastructure

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Date:	Sun, 28 Sep 2014 11:13:54 -0700
From:	Jeremiah Mahler <jmmahler@...il.com>
To:	Tanya Brokhman <tlinder@...eaurora.org>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: [RFC/PATCH 1/5] mtd: ubi: Read disturb infrastructure

Tanya,

On Sun, Sep 28, 2014 at 09:37:00AM +0300, Tanya Brokhman wrote:
> The need for performing read disturb is determined according to new
> statistics collected per eraseblock:
> - read counter: incremented at each read operation
>                 reset at each erase
> - last erase time stamp: updated at each erase
> 
> This patch adds the infrastructure for the above statistics
> 
> Signed-off-by: Tanya Brokhman <tlinder@...eaurora.org>
> ---
...
> @@ -385,6 +402,38 @@ static ssize_t dev_attribute_show(struct device *dev,
>  	return ret;
>  }
>  
> +static ssize_t dev_attribute_store(struct device *dev,
> +			   struct device_attribute *attr,
> +			   const char *buf, size_t count)
> +{
> +	int value;
> +	struct ubi_device *ubi;
> +
> +	ubi = container_of(dev, struct ubi_device, dev);
> +	ubi = ubi_get_device(ubi->ubi_num);
> +	if (!ubi)
> +		return -ENODEV;
> +
> +	if (kstrtos32(buf, 10, &value))
> +		return -EINVAL;
> +	/* Consider triggering full scan if threshods change */
> +	else if (attr == &dev_dt_threshold) {
> +		if (value < UBI_MAX_DT_THRESHOLD)
> +			ubi->dt_threshold = value;
> +		else
> +			pr_err("Max supported threshold value is %d",
> +				   UBI_MAX_DT_THRESHOLD);
> +	} else if (attr == &dev_rd_threshold) {
> +		if (value < UBI_MAX_READCOUNTER)
> +			ubi->rd_threshold = value;
> +		else
> +			pr_err("Max supported threshold value is %d",
> +				   UBI_MAX_READCOUNTER);
> +	}
> +
> +	return count;
> +}
> +
...

One small style nit.  As per Documentation/CodingStyle [line 169] if
one branch in a conditional uses braces then all branches should use
braces.

-- 
Jeremiah Mahler
jmmahler@...il.com
http://github.com/jmahler
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