scsi_transport_sas: add is_sas_attached() function
Adds a function designed to be callable any time (regardless of
whether the transport attributes are configured or not) which returns
true if the device is attached over a SAS transport. The design of
this function is that transport specific functions can be embedded
within a
if (is_sas_attached(sdev)) {
...
}
which would be compiled out (and thus eliminate the symbols) if SAS is
not configured.
Reviewed-by: Hannes Reinecke <hare@suse.com>
Signed-off-by: James Bottomley <James.Bottomley@HansenPartnership.com>
diff --git a/drivers/scsi/scsi_transport_sas.c b/drivers/scsi/scsi_transport_sas.c
index 30d26e3..b17f763 100644
--- a/drivers/scsi/scsi_transport_sas.c
+++ b/drivers/scsi/scsi_transport_sas.c
@@ -341,6 +341,22 @@
}
/**
+ * is_sas_attached - check if device is SAS attached
+ * @sdev: scsi device to check
+ *
+ * returns true if the device is SAS attached
+ */
+int is_sas_attached(struct scsi_device *sdev)
+{
+ struct Scsi_Host *shost = sdev->host;
+
+ return shost->transportt->host_attrs.ac.class ==
+ &sas_host_class.class;
+}
+EXPORT_SYMBOL(is_sas_attached);
+
+
+/**
* sas_remove_children - tear down a devices SAS data structures
* @dev: device belonging to the sas object
*