linux-kernel - [PATCH -mm 1/3] aha1532: remove ISA_DMA

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Message-Id: <1275289144-28782-2-git-send-email-fujita.tomonori@lab.ntt.co.jp>
Date:	Mon, 31 May 2010 15:59:02 +0900
From:	FUJITA Tomonori <fujita.tomonori@....ntt.co.jp>
To:	akpm@...ux-foundation.org
Cc:	jens.axboe@...cle.com, James.Bottomley@...e.de,
	linux-kernel@...r.kernel.org, linux-arch@...r.kernel.org,
	FUJITA Tomonori <fujita.tomonori@....ntt.co.jp>
Subject: [PATCH -mm 1/3] aha1532: remove ISA_DMA_THRESHOLD usage

We can safely remove ISA_DMA_THRESHOLD usage in aha1532. aha1532 uses
ISA_DMA_THRESHOLD to see if:

- the buffers in scatter/list are below 16MB.
- scsi_host is below 16MB.

Both checkings were added in the ancient times but aren't necessary
nowadays since we properly bounce the buffers and allocate scsi_host
below 16MB with non-zero unchecked_isa_dma.

Signed-off-by: FUJITA Tomonori <fujita.tomonori@....ntt.co.jp>
---
 drivers/scsi/aha1542.c |    9 ---------
 1 files changed, 0 insertions(+), 9 deletions(-)

diff --git a/drivers/scsi/aha1542.c b/drivers/scsi/aha1542.c
index 2a8cf13..f6175ed 100644
--- a/drivers/scsi/aha1542.c
+++ b/drivers/scsi/aha1542.c
@@ -691,8 +691,6 @@ static int aha1542_queuecommand(Scsi_Cmnd * SCpnt, void (*done) (Scsi_Cmnd *))
 		}
 		scsi_for_each_sg(SCpnt, sg, sg_count, i) {
 			any2scsi(cptr[i].dataptr, SCSI_SG_PA(sg));
-			if (SCSI_SG_PA(sg) + sg->length - 1 > ISA_DMA_THRESHOLD)
-				BAD_SG_DMA(SCpnt, scsi_sglist(SCpnt), sg_count, i);
 			any2scsi(cptr[i].datalen, sg->length);
 		};
 		any2scsi(ccb[mbo].datalen, sg_count * sizeof(struct chain));
@@ -1133,16 +1131,9 @@ static int __init aha1542_detect(struct scsi_host_template * tpnt)
 				release_region(bases[indx], 4);
 				continue;
 			}
-			/* For now we do this - until kmalloc is more intelligent
-			   we are resigned to stupid hacks like this */
-			if (SCSI_BUF_PA(shpnt) >= ISA_DMA_THRESHOLD) {
-				printk(KERN_ERR "Invalid address for shpnt with 1542.\n");
-				goto unregister;
-			}
 			if (!aha1542_test_port(bases[indx], shpnt))
 				goto unregister;
 
-
 			base_io = bases[indx];
 
 			/* Set the Bus on/off-times as not to ruin floppy performance */
-- 
1.6.5

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