diff options
| author | James Bottomley <James.Bottomley@HansenPartnership.com> | 2015-12-09 11:12:03 -0800 |
|---|---|---|
| committer | James Bottomley <James.Bottomley@HansenPartnership.com> | 2015-12-18 19:06:21 -0800 |
| commit | 3b91d09c1ca69a69c470efe5fbf346e3e90181d5 (patch) | |
| tree | 8b76b33089e2d7ae8c96e9919da48f217141da25 /drivers/scsi | |
| parent | ed94724bedcbc40cbfc12d16990e834d64220d3f (diff) | |
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')
| -rw-r--r-- | drivers/scsi/scsi_transport_sas.c | 16 |
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 * |