linux-kernel - RE: [PATCH] iwlwifi: mvm: make debugfs write() operations write up to count bytes

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Message-ID: <1DC40B07CD6EC041A66726C271A73AE61AA5E38C@IRSMSX102.ger.corp.intel.com>
Date:	Mon, 12 Aug 2013 08:19:12 +0000
From:	"Berg, Johannes" <johannes.berg@...el.com>
To:	Djalal Harouni <tixxdz@...ndz.org>,
	"Grumbach, Emmanuel" <emmanuel.grumbach@...el.com>,
	Intel Linux Wireless <ilw@...ux.intel.com>,
	"John W. Linville" <linville@...driver.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-wireless@...r.kernel.org" <linux-wireless@...r.kernel.org>
Subject: RE: [PATCH] iwlwifi: mvm: make debugfs write() operations write up
 to count bytes

> Some debugfs write() operations of the MVM Firmware will ignore the count
> argument, and will copy more bytes than what was specified.
> Fix this by getting the right count of bytes.
> 
> This will also honor restrictions put on the number of bytes to write.

That makes some sense.

> To be consitant this patch also switches the initializer from 'char buf[x] = {}' to
> the explicit memset() as it is done in other places of the same file.

I'd rather this (a) be done in a separate patch, and (b) the other way around, switch everything to C99.

> Cc: stable@...r.kernel.org

That doesn't really make sense for the debugfs interface.

> +	memset(buf, 0, sizeof(buf));
> +	if (count > sizeof(buf) - 1)
> +		count = sizeof(buf) - 1;

Why -1? And why not use min()/min_t()?

johannes
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