linux-kernel - [patch] iwlwifi: cleanup a mask shift in iwlagn_bt_traffic_is

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Message-ID: <20141029160827.GD5290@mwanda>
Date:	Wed, 29 Oct 2014 19:08:27 +0300
From:	Dan Carpenter <dan.carpenter@...cle.com>
To:	Johannes Berg <johannes.berg@...el.com>
Cc:	Emmanuel Grumbach <emmanuel.grumbach@...el.com>,
	Intel Linux Wireless <ilw@...ux.intel.com>,
	"John W. Linville" <linville@...driver.com>,
	Paul Gortmaker <paul.gortmaker@...driver.com>,
	Larry Finger <Larry.Finger@...inger.net>,
	linux-wireless@...r.kernel.org, netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org, kernel-janitors@...r.kernel.org
Subject: [patch] iwlwifi: cleanup a mask shift in iwlagn_bt_traffic_is_sco()

The shift operation is higher precedence so the code is wrong and it
sets of a static checker warning.  But it doesn't affect real life
because BT_UART_MSG_FRAME3SCOESCO_POS is zero so the shift is a no-op.

I have re-written it in normal style and with parenthesis as a cleanup
and to silence the static checker warning.

Signed-off-by: Dan Carpenter <dan.carpenter@...cle.com>

diff --git a/drivers/net/wireless/iwlwifi/dvm/lib.c b/drivers/net/wireless/iwlwifi/dvm/lib.c
index 2191621..065d3d5 100644
--- a/drivers/net/wireless/iwlwifi/dvm/lib.c
+++ b/drivers/net/wireless/iwlwifi/dvm/lib.c
@@ -418,7 +418,7 @@ void iwlagn_bt_adjust_rssi_monitor(struct iwl_priv *priv, bool rssi_ena)
 
 static bool iwlagn_bt_traffic_is_sco(struct iwl_bt_uart_msg *uart_msg)
 {
-	return BT_UART_MSG_FRAME3SCOESCO_MSK & uart_msg->frame3 >>
+	return (uart_msg->frame3 & BT_UART_MSG_FRAME3SCOESCO_MSK) >>
 			BT_UART_MSG_FRAME3SCOESCO_POS;
 }
 
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