[SCSI] fc_transport: Generalize WWN to u64 interger conversions.

On some platforms the hard-casting of 8 byte node_name and
port_name arrays to an u64 would cause unaligned-access
warnings.  Generalize the conversions with a transport
helper function which performs consistent shifting of WWN
bytes.
Signed-off-by: NAndrew Vasquez <andrew.vasquez@qlogic.com>
Signed-off-by: NJames Bottomley <James.Bottomley@SteelEye.com>

include/scsi/scsi_transport_fc.h

@@ -439,4 +439,12 @@ int fc_remote_port_block(struct fc_rport *rport);
 void fc_remote_port_unblock(struct fc_rport *rport);
 int scsi_is_fc_rport(const struct device *);
 
+static inline u64 wwn_to_u64(u8 *wwn)
+{
+	return (u64)wwn[0] << 56 | (u64)wwn[1] << 48 |
+	    (u64)wwn[2] << 40 | (u64)wwn[3] << 32 |
+	    (u64)wwn[4] << 24 | (u64)wwn[5] << 16 |
+	    (u64)wwn[6] <<  8 | (u64)wwn[7];
+}
+
 #endif /* SCSI_TRANSPORT_FC_H */