libata: add a host flag to ignore detected ATA devices

Where devices are visible via more than one host we sometimes wish to
indicate that cirtain devices should be ignored on a specific host.  Add a
host flag indicating that this host wishes to ignore ATA specific devices.

Signed-off-by: Andy Whitcroft <apw@canonical.com>
Signed-off-by: Jeff Garzik <jgarzik@redhat.com>

1 files changed, 6 insertions, 0 deletions

diff --git a/drivers/ata/libata-core.c b/drivers/ata/libata-core.c
index 23763a1ec570..d31ee557b395 100644
--- a/drivers/ata/libata-core.c
+++ b/drivers/ata/libata-core.c
@@ -1973,6 +1973,12 @@ retry:
         if (class == ATA_DEV_ATA) {
                 if (!ata_id_is_ata(id) && !ata_id_is_cfa(id))
                         goto err_out;
+                if (ap->host->flags & ATA_HOST_IGNORE_ATA &&
+                                                        ata_id_is_ata(id)) {
+                        ata_dev_dbg(dev,
+                                "host indicates ignore ATA devices, ignored\n");
+                        return -ENOENT;
+                }
         } else {
                 if (ata_id_is_ata(id))
                         goto err_out;