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aha1532: remove ISA_DMA_THRESHOLD usage 

We can safely remove ISA_DMA_THRESHOLD usage in aha1542. aha1542 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@lab.ntt.co.jp>
Acked-by: James Bottomley <James.Bottomley@suse.de>
Signed-off-by: Jens Axboe <jaxboe@fusionio.com>
This commit is contained in:
FUJITA Tomonori 2010-06-17 14:58:21 +02:00 committed by Jens Axboe
parent 41f2df6289
commit b375a612ad
1 changed files with 0 additions and 25 deletions
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25
drivers/scsi/aha1542.c
View File

@ -52,22 +52,6 @@
#define SCSI_BUF_PA(address) isa_virt_to_bus(address)
#define SCSI_SG_PA(sgent) (isa_page_to_bus(sg_page((sgent))) + (sgent)->offset)
static void BAD_SG_DMA(Scsi_Cmnd * SCpnt,
struct scatterlist *sgp,
int nseg,
int badseg)
{
printk(KERN_CRIT "sgpnt[%d:%d] page %p/0x%llx length %u\n",
badseg, nseg, sg_virt(sgp),
(unsigned long long)SCSI_SG_PA(sgp),
sgp->length);
/*
* Not safe to continue.
*/
panic("Buffer at physical address > 16Mb used for aha1542");
}
#include<linux/stat.h>
#ifdef DEBUG
@ -691,8 +675,6 @@ 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 +1115,9 @@ 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 */