netdev - Re: [PATCH] pegasus usb-net: Fix endianness bugs

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Message-ID: <20090618174621.GA3416@psychotron.englab.brq.redhat.com>
Date:	Thu, 18 Jun 2009 19:46:22 +0200
From:	Jiri Pirko <jpirko@...hat.com>
To:	Michael Buesch <mb@...sch.de>
Cc:	Petko Manolov <petkan@...rs.sourceforge.net>,
	linux-usb@...r.kernel.org, netdev@...r.kernel.org
Subject: Re: [PATCH] pegasus usb-net: Fix endianness bugs

Thu, Jun 18, 2009 at 07:03:47PM CEST, mb@...sch.de wrote:
>This fixes various endianness bugs. Some harmless and some real ones.
>This is tested on a PowerPC-64 machine.
>
>Signed-off-by: Michael Buesch <mb@...sch.de>
>Cc: Stable <stable@...nel.org>
>
>---
> drivers/net/usb/pegasus.c |   29 +++++++++++++++++------------
> 1 file changed, 17 insertions(+), 12 deletions(-)
>
>--- linux-2.6.30.orig/drivers/net/usb/pegasus.c
>+++ linux-2.6.30/drivers/net/usb/pegasus.c
>@@ -297,7 +297,7 @@ static int update_eth_regs_async(pegasus
> 
> 	pegasus->dr.bRequestType = PEGASUS_REQT_WRITE;
> 	pegasus->dr.bRequest = PEGASUS_REQ_SET_REGS;
>-	pegasus->dr.wValue = 0;
>+	pegasus->dr.wValue = cpu_to_le16(0);
Is this necessary? I mean zero is still zero :-)

> 	pegasus->dr.wIndex = cpu_to_le16(EthCtrl0);
> 	pegasus->dr.wLength = cpu_to_le16(3);
> 	pegasus->ctrl_urb->transfer_buffer_length = 3;
>@@ -446,11 +446,12 @@ static int write_eprom_word(pegasus_t * 
> 	int i;
> 	__u8 tmp, d[4] = { 0x3f, 0, 0, EPROM_WRITE };
> 	int ret;
>+	__le16 le_data = cpu_to_le16(data);
> 
> 	set_registers(pegasus, EpromOffset, 4, d);
> 	enable_eprom_write(pegasus);
> 	set_register(pegasus, EpromOffset, index);
>-	set_registers(pegasus, EpromData, 2, &data);
>+	set_registers(pegasus, EpromData, 2, &le_data);
> 	set_register(pegasus, EpromCtrl, EPROM_WRITE);
> 
> 	for (i = 0; i < REG_TIMEOUT; i++) {
>@@ -923,29 +924,32 @@ static struct net_device_stats *pegasus_
> 
> static inline void disable_net_traffic(pegasus_t * pegasus)
> {
>-	int tmp = 0;
>+	__le16 tmp = cpu_to_le16(0);
> 
>-	set_registers(pegasus, EthCtrl0, 2, &tmp);
>+	set_registers(pegasus, EthCtrl0, sizeof(tmp), &tmp);
> }
> 
> static inline void get_interrupt_interval(pegasus_t * pegasus)
> {
>-	__u8 data[2];
>+	u16 data;
>+	u8 interval;
> 
>-	read_eprom_word(pegasus, 4, (__u16 *) data);
>+	read_eprom_word(pegasus, 4, &data);
>+	interval = data >> 8;
> 	if (pegasus->usb->speed != USB_SPEED_HIGH) {
>-		if (data[1] < 0x80) {
>+		if (interval < 0x80) {
> 			if (netif_msg_timer(pegasus))
> 				dev_info(&pegasus->intf->dev, "intr interval "
> 					"changed from %ums to %ums\n",
>-					data[1], 0x80);
>-			data[1] = 0x80;
>+					interval, 0x80);
>+			interval = 0x80;
>+			data = (data & 0x00FF) | ((u16)interval << 8);
                                                  ^^^^^ you do not need this
							  typecast
> #ifdef PEGASUS_WRITE_EEPROM
>-			write_eprom_word(pegasus, 4, *(__u16 *) data);
>+			write_eprom_word(pegasus, 4, data);
> #endif
> 		}
> 	}
>-	pegasus->intr_interval = data[1];
>+	pegasus->intr_interval = interval;
> }
> 
> static void set_carrier(struct net_device *net)
>@@ -1299,7 +1303,8 @@ static int pegasus_blacklisted(struct us
> 	/* Special quirk to keep the driver from handling the Belkin Bluetooth
> 	 * dongle which happens to have the same ID.
> 	 */
>-	if ((udd->idVendor == VENDOR_BELKIN && udd->idProduct == 0x0121) &&
>+	if ((udd->idVendor == cpu_to_le16(VENDOR_BELKIN)) &&
>+	    (udd->idProduct == cpu_to_le16(0x0121)) &&
> 	    (udd->bDeviceClass == USB_CLASS_WIRELESS_CONTROLLER) &&
> 	    (udd->bDeviceProtocol == 1))
> 		return 1;
>
>
>-- 
>Greetings, Michael.
>--
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