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[SCSI] scsi_dh: fix kconfig related build errors

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Do not automatically "select" SCSI_DH for dm-multipath. If SCSI_DH
doesn't exist,just do not allow  hardware handlers to be used.

Handle SCSI_DH being a module also. Make sure it doesn't allow DM_MULTIPATH
to be compiled in when SCSI_DH is a module.

[jejb: added comment for Kconfig syntax]
Signed-off-by: Chandra Seetharaman <[email protected]>
Reported-by: Randy Dunlap <[email protected]>
Reported-by: Andrew Morton <[email protected]>
Signed-off-by: James Bottomley <[email protected]>
This commit is contained in:
Chandra Seetharaman 2008-05-23 18:16:40 -07:00 • committed by James Bottomley
commit fe9233fb69
3 changed files with 18 additions and 2 deletions
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6
drivers/md/Kconfig
View file

@ -252,7 +252,11 @@ config DM_ZERO
config DM_MULTIPATH
tristate "Multipath target"
depends on BLK_DEV_DM
select SCSI_DH
# nasty syntax but means make DM_MULTIPATH independent
# of SCSI_DH if the latter isn't defined but if
# it is, DM_MULTIPATH must depend on it. We get a build
# error if SCSI_DH=m and DM_MULTIPATH=y
depends on SCSI_DH || !SCSI_DH
---help---
Allow volume managers to support multipath hardware.

2
drivers/md/dm-mpath.c
View file

@ -664,6 +664,8 @@ static int parse_hw_handler(struct arg_set *as, struct multipath *m)
request_module("scsi_dh_%s", m->hw_handler_name);
if (scsi_dh_handler_exist(m->hw_handler_name) == 0) {
ti->error = "unknown hardware handler type";
kfree(m->hw_handler_name);
m->hw_handler_name = NULL;
return -EINVAL;
}
consume(as, hw_argc - 1);