linux-kernel - net-rsi: Reconsider usage of variable "vap_id" in rsi_send_mgmt

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Message-ID: <5687E8DB.3080706@users.sourceforge.net>
Date:	Sat, 2 Jan 2016 16:12:27 +0100
From:	SF Markus Elfring <elfring@...rs.sourceforge.net>
To:	linux-wireless@...r.kernel.org, netdev@...r.kernel.org,
	Kalle Valo <kvalo@...eaurora.org>
Cc:	LKML <linux-kernel@...r.kernel.org>,
	kernel-janitors@...r.kernel.org,
	Julia Lawall <julia.lawall@...6.fr>
Subject: net-rsi: Reconsider usage of variable "vap_id" in rsi_send_mgmt_pkt()

Hello,

I have taken another look at the implementation of the function "rsi_send_mgmt_pkt".
https://git.kernel.org/cgit/linux/kernel/git/next/linux-next.git/tree/drivers/net/wireless/rsi/rsi_91x_pkt.c?id=e8c58e7a5a106c3d557fccd01cd4d1128f9bab38#n114

I find the following statement combination interesting there.

…
	u8 vap_id = 0;
…
	msg[7] |= cpu_to_le16(vap_id << 8);
…

I would appreciate a further clarification.
Does a shift operation for a variable which contains zero indicate an open issue?

Regards,
Markus
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