From: Jeremy Higdon <jeremy@sgi.com>
Date: Thu, 2 Feb 2006 08:00:46 +0000 (-0800)
Subject: [PATCH] Fix sgiioc4 DMA timeout problem with 64KiB s/g elements.
X-Git-Url: http://git.cdn.openwrt.org/?a=commitdiff_plain;h=0271fc2db6260dd46f196191e24281af2fddb879;p=openwrt%2Fstaging%2Fblogic.git

[PATCH] Fix sgiioc4 DMA timeout problem with 64KiB s/g elements.

Problem caused by the fact that the code used to only pick the low 16
bits of the bytecount.  That may be how some controllers act on it (byte
count of 0 means 0x10000), but not for this particular hardware.

Signed-off-by: Jeremy Higdon <jeremy@sgi.com>
Acked-by: Jes Sorensen <jes@sgi.com>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
---

diff --git a/drivers/ide/pci/sgiioc4.c b/drivers/ide/pci/sgiioc4.c
index 4ee597d08797..2b286e865163 100644
--- a/drivers/ide/pci/sgiioc4.c
+++ b/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
@@ -510,7 +510,7 @@ sgiioc4_build_dma_table(ide_drive_t * drive, struct request *rq, int ddir)
 				       drive->name);
 				goto use_pio_instead;
 			} else {
-				u32 xcount, bcount =
+				u32 bcount =
 				    0x10000 - (cur_addr & 0xffff);
 
 				if (bcount > cur_len)
@@ -525,8 +525,7 @@ sgiioc4_build_dma_table(ide_drive_t * drive, struct request *rq, int ddir)
 				*table = 0x0;
 				table++;
 
-				xcount = bcount & 0xffff;
-				*table = cpu_to_be32(xcount);
+				*table = cpu_to_be32(bcount);
 				table++;
 
 				cur_addr += bcount;
@@ -680,7 +679,7 @@ sgiioc4_ide_setup_pci_device(struct pci_dev *dev, ide_pci_device_t * d)
 		return -EIO;
 
 	/* Create /proc/ide entries */
-	create_proc_ide_interfaces(); 
+	create_proc_ide_interfaces();
 
 	return 0;
 }