diff options
author | Cornelia Huck <cornelia.huck@de.ibm.com> | 2007-07-09 22:59:59 +0400 |
---|---|---|
committer | James Bottomley <jejb@mulgrave.localdomain> | 2007-07-15 04:28:10 +0400 |
commit | 7689e82efdb636e8a076a1293b977bce313110c5 (patch) | |
tree | 3d8702ff24a205db7670ad5425e3a35fe45b0f00 | |
parent | 6d877688ef411313c94aa3c83c7473fbec6db32c (diff) | |
download | linux-7689e82efdb636e8a076a1293b977bce313110c5.tar.xz |
[SCSI] don't build scsi_dma_{map,unmap} for !HAS_DMA
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>
-rw-r--r-- | drivers/scsi/Kconfig | 5 | ||||
-rw-r--r-- | drivers/scsi/Makefile | 6 | ||||
-rw-r--r-- | drivers/scsi/scsi_lib.c | 38 | ||||
-rw-r--r-- | drivers/scsi/scsi_lib_dma.c | 50 |
4 files changed, 58 insertions, 41 deletions
diff --git a/drivers/scsi/Kconfig b/drivers/scsi/Kconfig index 874cfee29358..6ac3873e4d73 100644 --- a/drivers/scsi/Kconfig +++ b/drivers/scsi/Kconfig @@ -10,6 +10,7 @@ config RAID_ATTRS config SCSI tristate "SCSI device support" depends on BLOCK + select SCSI_DMA if HAS_DMA ---help--- If you want to use a SCSI hard disk, SCSI tape drive, SCSI CD-ROM or any other SCSI device under Linux, say Y and make sure that you know @@ -29,6 +30,10 @@ config SCSI However, do not compile this as a module if your root file system (the one containing the directory /) is located on a SCSI device. +config SCSI_DMA + bool + default n + config SCSI_TGT tristate "SCSI target support" depends on SCSI && EXPERIMENTAL diff --git a/drivers/scsi/Makefile b/drivers/scsi/Makefile index cbc2e2ba5412..0f8689557158 100644 --- a/drivers/scsi/Makefile +++ b/drivers/scsi/Makefile @@ -148,9 +148,9 @@ obj-$(CONFIG_SCSI_DEBUG) += scsi_debug.o obj-$(CONFIG_SCSI_WAIT_SCAN) += scsi_wait_scan.o scsi_mod-y += scsi.o hosts.o scsi_ioctl.o constants.o \ - scsicam.o scsi_error.o scsi_lib.o \ - scsi_scan.o scsi_sysfs.o \ - scsi_devinfo.o + scsicam.o scsi_error.o scsi_lib.o +scsi_mod-$(CONFIG_SCSI_DMA) += scsi_lib_dma.o +scsi_mod-y += scsi_scan.o scsi_sysfs.o scsi_devinfo.o scsi_mod-$(CONFIG_SCSI_NETLINK) += scsi_netlink.o scsi_mod-$(CONFIG_SYSCTL) += scsi_sysctl.o scsi_mod-$(CONFIG_SCSI_PROC_FS) += scsi_proc.o diff --git a/drivers/scsi/scsi_lib.c b/drivers/scsi/scsi_lib.c index 70454b4e8485..1f5a07bf2a75 100644 --- a/drivers/scsi/scsi_lib.c +++ b/drivers/scsi/scsi_lib.c @@ -2290,41 +2290,3 @@ void scsi_kunmap_atomic_sg(void *virt) kunmap_atomic(virt, KM_BIO_SRC_IRQ); } EXPORT_SYMBOL(scsi_kunmap_atomic_sg); - -/** - * 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); diff --git a/drivers/scsi/scsi_lib_dma.c b/drivers/scsi/scsi_lib_dma.c new file mode 100644 index 000000000000..ac6855cd2657 --- /dev/null +++ b/drivers/scsi/scsi_lib_dma.c @@ -0,0 +1,50 @@ +/* + * 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); |