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/include/scsi/scsi_transport_sas.h b/include/scsi/scsi_transport_sas.h
index 0bd71e2..a8fdd10 100644
--- a/include/scsi/scsi_transport_sas.h
+++ b/include/scsi/scsi_transport_sas.h
@@ -10,6 +10,15 @@
struct sas_rphy;
struct request;
+#if !IS_ENABLED(CONFIG_SCSI_SAS_ATTRS)
+static inline int is_sas_attached(struct scsi_device *sdev)
+{
+ return 0;
+}
+#else
+extern int is_sas_attached(struct scsi_device *sdev);
+#endif
+
static inline int sas_protocol_ata(enum sas_protocol proto)
{
return ((proto & SAS_PROTOCOL_SATA) ||