From 4807b51895dce8aa650ebebc51fa4a795ed6b8b8 Mon Sep 17 00:00:00 2001
From: Loic Poulain <loic.poulain@intel.com>
Date: Fri, 8 Aug 2014 19:07:16 +0200
Subject: [PATCH] Bluetooth: Fix HCI H5 corrupted ack value

In this expression: seq = (seq - 1) % 8
seq (u8) is implicitly converted to an int in the arithmetic operation.
So if seq value is 0, operation is ((0 - 1) % 8) => (-1 % 8) => -1.
The new seq value is 0xff which is an invalid ACK value, we expect 0x07.
It leads to frequent dropped ACK and retransmission.
Fix this by using '&' binary operator instead of '%'.

Signed-off-by: Loic Poulain <loic.poulain@intel.com>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
Cc: stable@vger.kernel.org
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