linux-kernel - Re: [PATCHv1 4/6] firmware: add Intel Stratix10 remote system update driver

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Date:   Thu, 25 Apr 2019 22:30:46 +0200
From:   Greg KH <gregkh@...uxfoundation.org>
To:     richard.gong@...ux.intel.com
Cc:     robh+dt@...nel.org, mark.rutland@....com, dinguyen@...nel.org,
        atull@...nel.org, linux-kernel@...r.kernel.org,
        devicetree@...r.kernel.org, Richard Gong <richard.gong@...el.com>
Subject: Re: [PATCHv1 4/6] firmware: add Intel Stratix10 remote system update
 driver

On Tue, Apr 09, 2019 at 01:46:00PM -0500, richard.gong@...ux.intel.com wrote:
> +/*
> + * This driver exposes some optional features of the Intel Stratix 10 SoC FPGA.
> + * The SysFS interfaces exposed here are FPGA Remote System Update (RSU)

It has never been "SysFS", it has always been "sysfs".

> + * related.  They allow user space software to query the configuration system
> + * status and to request optional reboot behavior specific to Intel FPGAs.
> + */
> +
> +static ssize_t current_image_show(struct device *dev,
> +				  struct device_attribute *attr, char *buf)
> +{
> +	struct stratix10_rsu_priv *priv = dev_get_drvdata(dev);
> +
> +	if (!priv)
> +		return -ENODEV;
> +
> +	return scnprintf(buf, PAGE_SIZE, "%ld", priv->status.current_image);

While it is all nice and fine to try to be "safe" and use scnprintf() it
turns out that if you EVER care about the size of a sysfs buffer, your
code is doing something wrong.  This can just be a simple sprintf()
call.

Same goes for everywhere in this file.

thanks,

greg k-h