[SCSI] raid_attrs: fix dependency problems

RAID attributes uses scsi_is_sdev_device() to gate some SCSI specific
checking code.  This causes two problems.  Firstly if SCSI == n just
defining scsi_is_sdev_device() to return false might not be enough to
prevent gcc from emitting the code (and thus referring to undefined
symbols), so this needs surrounding with an ifdef.  Secondly, using
scsi_is_sdev_device() when SCSI is either y or m gives a subtle
problem in the m case: raid_attrs must also be m to use the symbol.
Do the usual Kconfig jiggery-pokery to fix this.

Reported-by: Randy Dunlap <randy.dunlap@oracle.com>
Signed-off-by: James Bottomley <James.Bottomley@suse.de>

2 files changed, 8 insertions, 0 deletions

diff --git a/drivers/scsi/Kconfig b/drivers/scsi/Kconfig
index 9191d1ea6451..75f2336807cb 100644
--- a/drivers/scsi/Kconfig
+++ b/drivers/scsi/Kconfig
@@ -1,9 +1,15 @@
 menu "SCSI device support"
 
+config SCSI_MOD
+       tristate
+       default y if SCSI=n || SCSI=y
+       default m if SCSI=m
+
 config RAID_ATTRS
         tristate "RAID Transport Class"
         default n
         depends on BLOCK
+        depends on SCSI_MOD
         ---help---
           Provides RAID
 
diff --git a/drivers/scsi/raid_class.c b/drivers/scsi/raid_class.c
index bd88349b8526..2c146b44d95f 100644
--- a/drivers/scsi/raid_class.c
+++ b/drivers/scsi/raid_class.c
@@ -63,6 +63,7 @@ static int raid_match(struct attribute_container *cont, struct device *dev)
          * emulated RAID devices, so start with SCSI */
         struct raid_internal *i = ac_to_raid_internal(cont);
 
+#if defined(CONFIG_SCSI) || defined(CONFIG_SCSI_MODULE)
         if (scsi_is_sdev_device(dev)) {
                 struct scsi_device *sdev = to_scsi_device(dev);
 
@@ -71,6 +72,7 @@ static int raid_match(struct attribute_container *cont, struct device *dev)
 
                 return i->f->is_raid(dev);
         }
+#endif
         /* FIXME: look at other subsystems too */
         return 0;
 }