[PATCH] libata: implement ata_eh_wait()

Implement ata_eh_wait().  On return from this function, it's
guaranteed that the EH which was pending or in progress when the
function was called is complete - including the tailing part of SCSI
EH.  This will be used by hotplug and others to synchronize with EH.

Signed-off-by: Tejun Heo <htejun@gmail.com>

1 files changed, 1 insertions, 0 deletions

diff --git a/drivers/scsi/libata-core.c b/drivers/scsi/libata-core.c
index 11df827e166f..66df895c9617 100644
--- a/drivers/scsi/libata-core.c
+++ b/drivers/scsi/libata-core.c
@@ -5189,6 +5189,7 @@ static void ata_host_init(struct ata_port *ap, struct Scsi_Host *host,
 
         INIT_WORK(&ap->port_task, NULL, NULL);
         INIT_LIST_HEAD(&ap->eh_done_q);
+        init_waitqueue_head(&ap->eh_wait_q);
 
         /* set cable type */
         ap->cbl = ATA_CBL_NONE;