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| author | Chandra Seetharaman <sekharan@us.ibm.com> | 2008-05-23 18:16:40 -0700 |
|---|---|---|
| committer | James Bottomley <James.Bottomley@HansenPartnership.com> | 2008-07-15 09:16:43 -0500 |
| commit | fe9233fb6914a0eb20166c967e3020f7f0fba2c9 (patch) | |
| tree | 45d6f25301e41ff9323f2eee20fce6ae341cda7f | |
| parent | d7f305e9a08040649b0800245e67708df58cdb55 (diff) | |
| download | linux-fe9233fb6914a0eb20166c967e3020f7f0fba2c9.tar.gz linux-fe9233fb6914a0eb20166c967e3020f7f0fba2c9.tar.bz2 linux-fe9233fb6914a0eb20166c967e3020f7f0fba2c9.zip | |
[SCSI] scsi_dh: fix kconfig related build errors
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 <sekharan@us.ibm.com>
Reported-by: Randy Dunlap <randy.dunlap@oracle.com>
Reported-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: James Bottomley <James.Bottomley@HansenPartnership.com>
| -rw-r--r-- | drivers/md/Kconfig | 6 | ||||
| -rw-r--r-- | drivers/md/dm-mpath.c | 2 | ||||
| -rw-r--r-- | include/scsi/scsi_dh.h | 12 |
3 files changed, 18 insertions, 2 deletions
diff --git a/drivers/md/Kconfig b/drivers/md/Kconfig index b4a3c7d1451d..07d92c11b5d8 100644 --- a/drivers/md/Kconfig +++ b/drivers/md/Kconfig @@ -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. diff --git a/drivers/md/dm-mpath.c b/drivers/md/dm-mpath.c index e8f704aa46f2..9f7302d4878d 100644 --- a/drivers/md/dm-mpath.c +++ b/drivers/md/dm-mpath.c @@ -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); diff --git a/include/scsi/scsi_dh.h b/include/scsi/scsi_dh.h index 04d0d8495c83..3ad2303d1a16 100644 --- a/include/scsi/scsi_dh.h +++ b/include/scsi/scsi_dh.h @@ -54,6 +54,16 @@ enum { SCSI_DH_NOSYS, SCSI_DH_DRIVER_MAX, }; - +#if defined(CONFIG_SCSI_DH) || defined(CONFIG_SCSI_DH_MODULE) extern int scsi_dh_activate(struct request_queue *); extern int scsi_dh_handler_exist(const char *); +#else +static inline int scsi_dh_activate(struct request_queue *req) +{ + return 0; +} +static inline int scsi_dh_handler_exist(const char *name) +{ + return 0; +} +#endif |