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authorJames Bottomley <James.Bottomley@HansenPartnership.com>2015-12-09 22:12:03 +0300
committerJames Bottomley <James.Bottomley@HansenPartnership.com>2015-12-19 06:06:21 +0300
commit3b91d09c1ca69a69c470efe5fbf346e3e90181d5 (patch)
tree8b76b33089e2d7ae8c96e9919da48f217141da25 /drivers/scsi/scsi_transport_sas.c
parented94724bedcbc40cbfc12d16990e834d64220d3f (diff)
downloadlinux-3b91d09c1ca69a69c470efe5fbf346e3e90181d5.tar.xz
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>
Diffstat (limited to 'drivers/scsi/scsi_transport_sas.c')
-rw-r--r--drivers/scsi/scsi_transport_sas.c16
1 files changed, 16 insertions, 0 deletions
diff --git a/drivers/scsi/scsi_transport_sas.c b/drivers/scsi/scsi_transport_sas.c
index 30d26e345dcc..b17f763a73b2 100644
--- a/drivers/scsi/scsi_transport_sas.c
+++ b/drivers/scsi/scsi_transport_sas.c
@@ -341,6 +341,22 @@ static int do_sas_phy_delete(struct device *dev, void *data)
}
/**
+ * 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
*