mirror of
https://mirrors.bfsu.edu.cn/git/linux.git
synced 2024-11-18 09:44:18 +08:00
7689e82efd
With
dma-mapping-prevent-dma-dependent-code-from-linking-on.patch
scsi fails to build on !HAS_DMA architectures:
drivers/built-in.o(.text+0x20af6): In function `scsi_dma_map':
: undefined reference to `dma_map_sg'
drivers/built-in.o(.text+0x20b5c): In function `scsi_dma_unmap':
: undefined reference to `dma_unmap_sg'
I split those functions out into a new file. Builds on s390 and i386.
Move scsi_dma_{map,unmap} into scsi_lib_dma.c which is only build if
HAS_DMA is set.
Signed-off-by: Cornelia Huck <cornelia.huck@de.ibm.com>
Cc: Martin Schwidefsky <schwidefsky@de.ibm.com>
Cc: Heiko Carstens <heiko.carstens@de.ibm.com>
Cc: James Bottomley <James.Bottomley@SteelEye.com>
Cc: Jeff Garzik <jeff@garzik.org>
Cc: Christoph Hellwig <hch@lst.de>
Cc: Dan Williams <dan.j.williams@intel.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>
51 lines
1.1 KiB
C
51 lines
1.1 KiB
C
/*
|
|
* SCSI library functions depending on DMA
|
|
*/
|
|
|
|
#include <linux/blkdev.h>
|
|
#include <linux/device.h>
|
|
#include <linux/kernel.h>
|
|
|
|
#include <scsi/scsi.h>
|
|
#include <scsi/scsi_cmnd.h>
|
|
#include <scsi/scsi_device.h>
|
|
#include <scsi/scsi_host.h>
|
|
|
|
/**
|
|
* scsi_dma_map - perform DMA mapping against command's sg lists
|
|
* @cmd: scsi command
|
|
*
|
|
* Returns the number of sg lists actually used, zero if the sg lists
|
|
* is NULL, or -ENOMEM if the mapping failed.
|
|
*/
|
|
int scsi_dma_map(struct scsi_cmnd *cmd)
|
|
{
|
|
int nseg = 0;
|
|
|
|
if (scsi_sg_count(cmd)) {
|
|
struct device *dev = cmd->device->host->shost_gendev.parent;
|
|
|
|
nseg = dma_map_sg(dev, scsi_sglist(cmd), scsi_sg_count(cmd),
|
|
cmd->sc_data_direction);
|
|
if (unlikely(!nseg))
|
|
return -ENOMEM;
|
|
}
|
|
return nseg;
|
|
}
|
|
EXPORT_SYMBOL(scsi_dma_map);
|
|
|
|
/**
|
|
* scsi_dma_unmap - unmap command's sg lists mapped by scsi_dma_map
|
|
* @cmd: scsi command
|
|
*/
|
|
void scsi_dma_unmap(struct scsi_cmnd *cmd)
|
|
{
|
|
if (scsi_sg_count(cmd)) {
|
|
struct device *dev = cmd->device->host->shost_gendev.parent;
|
|
|
|
dma_unmap_sg(dev, scsi_sglist(cmd), scsi_sg_count(cmd),
|
|
cmd->sc_data_direction);
|
|
}
|
|
}
|
|
EXPORT_SYMBOL(scsi_dma_unmap);
|