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Commit 3b91d09c authored by James Bottomley's avatar James Bottomley
Browse files

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: default avatarHannes Reinecke <hare@suse.com>
Signed-off-by: default avatarJames Bottomley <James.Bottomley@HansenPartnership.com>
parent ed94724b

drivers/scsi/scsi_transport_sas.c

+16 −0
Original line number Diff line number Diff line
@@ -340,6 +340,22 @@ static int do_sas_phy_delete(struct device *dev, void *data) 
	return 0;

}



/**

 * 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

include/scsi/scsi_transport_sas.h

+9 −0
Original line number Diff line number Diff line
@@ -10,6 +10,15 @@ struct scsi_transport_template; 
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) ||