linux-kernel - Re: [PATCH] firewire: convert sysfs sprintf/snprintf family to sysfs

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Date:   Wed, 03 Feb 2021 23:05:22 -0800
From:   Joe Perches <joe@...ches.com>
To:     Jiapeng Chong <jiapeng.chong@...ux.alibaba.com>,
        stefanr@...6.in-berlin.de
Cc:     linux1394-devel@...ts.sourceforge.net, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] firewire: convert sysfs sprintf/snprintf family to
 sysfs_emit

On Thu, 2021-02-04 at 14:50 +0800, Jiapeng Chong wrote:
> Fix the following coccicheck warning:
> 
> ./drivers/firewire/core-device.c:375:8-16: WARNING: use scnprintf or
> sprintf.
[]
> diff --git a/drivers/firewire/core-device.c b/drivers/firewire/core-device.c
[]
> @@ -372,8 +372,7 @@ static ssize_t rom_index_show(struct device *dev,
>  	struct fw_device *device = fw_device(dev->parent);
>  	struct fw_unit *unit = fw_unit(dev);
>  
> 
> -	return snprintf(buf, PAGE_SIZE, "%d\n",
> -			(int)(unit->directory - device->config_rom));
> +	return sysfs_emit(buf, "%d\n", (int)(unit->directory - device->config_rom));

Perhaps this should use the ptrdiff_t qualifier '%td' instead:

	return sysfs_emit(buf, "%td\n", unit->directory - device->config_rom);