mirror of
git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
synced 2025-09-04 20:19:47 +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
/*
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* SCSI library functions depending on DMA
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*/
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#include <linux/blkdev.h>
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#include <linux/device.h>
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#include <linux/kernel.h>
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#include <scsi/scsi.h>
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#include <scsi/scsi_cmnd.h>
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#include <scsi/scsi_device.h>
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#include <scsi/scsi_host.h>
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/**
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* scsi_dma_map - perform DMA mapping against command's sg lists
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* @cmd: scsi command
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*
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* Returns the number of sg lists actually used, zero if the sg lists
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* is NULL, or -ENOMEM if the mapping failed.
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*/
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int scsi_dma_map(struct scsi_cmnd *cmd)
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{
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int nseg = 0;
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if (scsi_sg_count(cmd)) {
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struct device *dev = cmd->device->host->shost_gendev.parent;
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nseg = dma_map_sg(dev, scsi_sglist(cmd), scsi_sg_count(cmd),
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cmd->sc_data_direction);
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if (unlikely(!nseg))
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return -ENOMEM;
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}
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return nseg;
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}
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EXPORT_SYMBOL(scsi_dma_map);
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/**
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* scsi_dma_unmap - unmap command's sg lists mapped by scsi_dma_map
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* @cmd: scsi command
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*/
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void scsi_dma_unmap(struct scsi_cmnd *cmd)
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{
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if (scsi_sg_count(cmd)) {
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struct device *dev = cmd->device->host->shost_gendev.parent;
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dma_unmap_sg(dev, scsi_sglist(cmd), scsi_sg_count(cmd),
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cmd->sc_data_direction);
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}
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}
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EXPORT_SYMBOL(scsi_dma_unmap);
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