linux-kernel - [PATCH v2 2/2] rt2800usb:fix hang during firmware load

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Message-ID: <20140612173341.15935.7058.stgit@charlie.fem.tu-ilmenau.de>
Date:	Thu, 12 Jun 2014 19:33:41 +0200
From:	Michael Braun <michael-dev@...i-braun.de>
To:	Ivo van Doorn <IvDoorn@...il.com>,
	Helmut Schaa <helmut.schaa@...glemail.com>
Cc:	netdev@...r.kernel.org, users@...x00.serialmonkey.com,
	linux-wireless@...r.kernel.org,
	"John W. Linville" <linville@...driver.com>,
	linux-kernel@...r.kernel.org
Subject: [PATCH v2 2/2] rt2800usb:fix hang during firmware load

The device 057c:8501 (AVM Fritz! WLAN v2 rev. B) boots into a state that does
not actually require loading a firmware file. The vendors driver finds out
about this by checking a firmware state register, so this patch adds this here.

Finally, with this patch applied, my wifi dongle actually becomes
useful (scan + connect to wpa network works).

Signed-off-by: Michael Braun <michael-dev@...i-braun.de>
---
 drivers/net/wireless/rt2x00/rt2800usb.c |    9 +++++++--
 1 file changed, 7 insertions(+), 2 deletions(-)

diff --git a/drivers/net/wireless/rt2x00/rt2800usb.c b/drivers/net/wireless/rt2x00/rt2800usb.c
index 11583ca..e11dab2 100644
--- a/drivers/net/wireless/rt2x00/rt2800usb.c
+++ b/drivers/net/wireless/rt2x00/rt2800usb.c
@@ -278,8 +278,13 @@ static int rt2800usb_write_firmware(struct rt2x00_dev *rt2x00dev,
 	/*
 	 * Write firmware to device.
 	 */
-	rt2x00usb_register_multiwrite(rt2x00dev, FIRMWARE_IMAGE_BASE,
-				      data + offset, length);
+	if (rt2800usb_autorun_detect(rt2x00dev)) {
+		rt2x00_info(rt2x00dev,
+			    "Firmware loading not required - NIC in AutoRun mode\n");
+	} else {
+		rt2x00usb_register_multiwrite(rt2x00dev, FIRMWARE_IMAGE_BASE,
+					      data + offset, length);
+	}
 
 	rt2x00usb_register_write(rt2x00dev, H2M_MAILBOX_CID, ~0);
 	rt2x00usb_register_write(rt2x00dev, H2M_MAILBOX_STATUS, ~0);

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