linux-kernel - [PATCH] firewire: fw-ohci: write selfIDBufferPtr before LinkControl.rcvSelfID

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Date:	Thu, 5 Jun 2008 20:50:53 +0200 (CEST)
From:	Stefan Richter <stefanr@...6.in-berlin.de>
To:	linux1394-devel@...ts.sourceforge.net
cc:	linux-kernel@...r.kernel.org
Subject: [PATCH] firewire: fw-ohci: write selfIDBufferPtr before
 LinkControl.rcvSelfID

OHCI 1.1 clause 5.10 requires that selfIDBufferPtr is valid when a 1 is
written into LinkControl.rcvSelfID.

This driver bug has so far not been known to cause harm because most
chips obviously accept a later selfIDBufferPtr write.

Signed-off-by: Stefan Richter <stefanr@...6.in-berlin.de>
---
 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
@@ -1473,6 +1473,7 @@ static int ohci_enable(struct fw_card *c
 	reg_write(ohci, OHCI1394_HCControlClear,
 		  OHCI1394_HCControl_noByteSwapData);
 
+	reg_write(ohci, OHCI1394_SelfIDBuffer, ohci->self_id_bus);
 	reg_write(ohci, OHCI1394_LinkControlClear,
 		  OHCI1394_LinkControl_rcvPhyPkt);
 	reg_write(ohci, OHCI1394_LinkControlSet,
@@ -1488,7 +1489,6 @@ static int ohci_enable(struct fw_card *c
 	ar_context_run(&ohci->ar_request_ctx);
 	ar_context_run(&ohci->ar_response_ctx);
 
-	reg_write(ohci, OHCI1394_SelfIDBuffer, ohci->self_id_bus);
 	reg_write(ohci, OHCI1394_PhyUpperBound, 0x00010000);
 	reg_write(ohci, OHCI1394_IntEventClear, ~0);
 	reg_write(ohci, OHCI1394_IntMaskClear, ~0);

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

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