linux-kernel - [PATCH 1/1] rt2x00: Fix chipset detection for rt2500usb

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Message-Id: <1247758091-14373-1-git-send-email-apw@canonical.com>
Date:	Thu, 16 Jul 2009 16:28:11 +0100
From:	Andy Whitcroft <apw@...onical.com>
To:	Ivo van Doorn <IvDoorn@...il.com>,
	"John W. Linville" <linville@...driver.com>
Cc:	Andy Whitcroft <apw@...onical.com>, linux-wireless@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH 1/1] rt2x00: Fix chipset detection for rt2500usb

The commit below changed the semantics of rt2x00_check_rev so that it no
longer checked the bottom 4 bits of the rev were non-zero.  During that
conversion this part of the check was not propogated to the rt2500usb
initialisation.

    commit 358623c22c9fd837b3b1b444377037f72553dc9f
    Author: Ivo van Doorn <ivdoorn@...il.com>
    Date:   Tue May 5 19:46:08 2009 +0200

        rt2x00: Simplify rt2x00_check_rev

Without this check rt73 devices are miss recognised as rt2500 devices and
two drivers are loaded.  Preventing the device being used.  Reinstate this
check.

Signed-off-by: Andy Whitcroft <apw@...onical.com>
---
 drivers/net/wireless/rt2x00/rt2500usb.c |    4 +++-
 1 files changed, 3 insertions(+), 1 deletions(-)

diff --git a/drivers/net/wireless/rt2x00/rt2500usb.c b/drivers/net/wireless/rt2x00/rt2500usb.c
index 66daf68..ce75426 100644
--- a/drivers/net/wireless/rt2x00/rt2500usb.c
+++ b/drivers/net/wireless/rt2x00/rt2500usb.c
@@ -1550,7 +1550,9 @@ static int rt2500usb_init_eeprom(struct rt2x00_dev *rt2x00dev)
 	rt2500usb_register_read(rt2x00dev, MAC_CSR0, &reg);
 	rt2x00_set_chip(rt2x00dev, RT2570, value, reg);
 
-	if (!rt2x00_check_rev(&rt2x00dev->chip, 0x000ffff0, 0)) {
+	if (!rt2x00_check_rev(&rt2x00dev->chip, 0x000ffff0, 0) ||
+	    rt2x00_check_rev(&rt2x00dev->chip, 0x0000000f, 0)) {
+
 		ERROR(rt2x00dev, "Invalid RT chipset detected.\n");
 		return -ENODEV;
 	}
-- 
1.6.3.rc3.199.g24398

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