linux-kernel - [PATCH 1/2] firewire: endianess fix

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Date:	Sat, 23 Feb 2008 12:24:17 +0100 (CET)
From:	Stefan Richter <stefanr@...6.in-berlin.de>
To:	linux1394-devel@...ts.sourceforge.net
cc:	Harvey Harrison <harvey.harrison@...il.com>,
	Sam Ravnborg <sam@...nborg.org>, linux-kernel@...r.kernel.org,
	sparclinux@...r.kernel.org, linuxppc-dev@...abs.org,
	Kristian Hoegsberg <krh@...planet.net>,
	Jarod Wilson <jwilson@...hat.com>
Subject: [PATCH 1/2] firewire: endianess fix

The generation of incoming requests was filled in in wrong byte order on
machines with big endian CPU.

Signed-off-by: Stefan Richter <stefanr@...6.in-berlin.de>
Cc: sparclinux@...r.kernel.org
Cc: linuxppc-dev@...abs.org
---

This patch is a shot in the dark, based on a warning when building with
C=1 CHECKFLAGS="-D__CHECK_ENDIAN__".  Is it really a fix, or was the
previous code accidentally correct?

This needs to be tested on different big endian PCs, if possible with
the Apple Uninorth FireWire controller and other types of controllers.
One test which involves ohci->request_generation is simply with an SBP-2
device (harddisk, CD-ROM...).  Does SBP-2 login etc. work?

If possible, also test whether the device remains accessible after
forcing a bus reset, e.g. by "echo br short > firecontrol".  You need
the easy to build utility firecontrol and a libraw1394 with "juju"
backend.  See wiki.linux1394.org for directions.

 drivers/firewire/fw-ohci.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

Index: linux/drivers/firewire/fw-ohci.c
===================================================================
--- linux.orig/drivers/firewire/fw-ohci.c
+++ linux/drivers/firewire/fw-ohci.c
@@ -375,7 +375,7 @@ static __le32 *handle_ar_packet(struct a
 	 */

 	if (p.ack + 16 == 0x09)
-		ohci->request_generation = (buffer[2] >> 16) & 0xff;
+		ohci->request_generation = (p.header[2] >> 16) & 0xff;
 	else if (ctx == &ohci->ar_request_ctx)
 		fw_core_handle_request(&ohci->card, &p);
 	else

-- 
Stefan Richter
-=====-==--- --=- =-===
http://arcgraph.de/sr/

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