linux-kernel - [PATCH] Bluetooth: Fix abuse of the preincrement operator

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Message-ID: <20100628125752.8945.50572.stgit@warthog.procyon.org.uk>
Date:	Mon, 28 Jun 2010 13:57:52 +0100
From:	David Howells <dhowells@...hat.com>
To:	linux-bluetooth@...r.kernel.org
Cc:	justinmattock@...il.com, dhowells@...hat.com,
	linux-kernel@...r.kernel.org, gustavo@...ovan.org
Subject: [PATCH] Bluetooth: Fix abuse of the preincrement operator

Fix abuse of the preincrement operator as detected when building with gcc
4.6.0:

	 CC [M]  drivers/bluetooth/hci_bcsp.o
	drivers/bluetooth/hci_bcsp.c: In function 'bcsp_prepare_pkt':
	drivers/bluetooth/hci_bcsp.c:247:20: warning: operation on 'bcsp->msgq_txseq' may be undefined

Reported-by: Justin P. Mattock <justinmattock@...il.com>
Signed-off-by: David Howells <dhowells@...hat.com>
---

 drivers/bluetooth/hci_bcsp.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/drivers/bluetooth/hci_bcsp.c b/drivers/bluetooth/hci_bcsp.c
index 40aec0f..42d69d4 100644
--- a/drivers/bluetooth/hci_bcsp.c
+++ b/drivers/bluetooth/hci_bcsp.c
@@ -244,7 +244,7 @@ static struct sk_buff *bcsp_prepare_pkt(struct bcsp_struct *bcsp, u8 *data,
 	if (rel) {
 		hdr[0] |= 0x80 + bcsp->msgq_txseq;
 		BT_DBG("Sending packet with seqno %u", bcsp->msgq_txseq);
-		bcsp->msgq_txseq = ++(bcsp->msgq_txseq) & 0x07;
+		bcsp->msgq_txseq = (bcsp->msgq_txseq + 1) & 0x07;
 	}
 
 	if (bcsp->use_crc)

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