[patch] SGIIOC4 limit request size

[Jes Sorensen <jes@sgi.com>]

Hi,

This one takes care of a problem with the SGI IOC4 driver where it
hits DMA problems if the request grows too large.

Cheers,
Jes

Avoid requests larger than the number of SG table entries, to avoid
DMA timeouts.

Signed-off-by: Jes Sorensen <jes@sgi.com>

----

 drivers/ide/pci/sgiioc4.c |    8 +++++++-
 1 files changed, 7 insertions(+), 1 deletion(-)

Index: linux-2.6/drivers/ide/pci/sgiioc4.c
===================================================================
--- linux-2.6.orig/drivers/ide/pci/sgiioc4.c
+++ linux-2.6/drivers/ide/pci/sgiioc4.c
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2003 Silicon Graphics, Inc.  All Rights Reserved.
+ * Copyright (C) 2003, 2006 Silicon Graphics, Inc.  All Rights Reserved.
  *
  * This program is free software; you can redistribute it and/or modify it
  * under the terms of version 2 of the GNU General Public License
@@ -613,6 +613,12 @@
 	hwif->ide_dma_lostirq = &sgiioc4_ide_dma_lostirq;
 	hwif->ide_dma_timeout = &__ide_dma_timeout;
 	hwif->INB = &sgiioc4_INB;
+
+	/*
+	 * Limit the request size to avoid DMA timeouts when
+	 * requesting  more entries than goes in the sg table.
+	 */
+	hwif->rqsize = 127;
 }
 
 static int __devinit
-
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