[PATCH] libata: implement ATA_FLAG_IN_EH port flag

ATA_FLAG_IN_EH flag is set on entry to EH and cleared on completion.
This patch just sets and clears the flag.  Following patches will
build normal qc execution / EH synchronization aroung this flag.

Signed-off-by: Tejun Heo <htejun@gmail.com>
Signed-off-by: Jeff Garzik <jgarzik@pobox.com>

1 files changed, 9 insertions, 0 deletions

diff --git a/drivers/scsi/libata-scsi.c b/drivers/scsi/libata-scsi.c
index 2d328b3af067..3a4f40b251fb 100644
--- a/drivers/scsi/libata-scsi.c
+++ b/drivers/scsi/libata-scsi.c
@@ -735,6 +735,11 @@ int ata_scsi_error(struct Scsi_Host *host)
 
         DPRINTK("ENTER\n");
 
+        spin_lock_irqsave(&ap->host_set->lock, flags);
+        assert(!(ap->flags & ATA_FLAG_IN_EH));
+        ap->flags |= ATA_FLAG_IN_EH;
+        spin_unlock_irqrestore(&ap->host_set->lock, flags);
+
         ap = (struct ata_port *) &host->hostdata[0];
         ap->ops->eng_timeout(ap);
 
@@ -742,6 +747,10 @@ int ata_scsi_error(struct Scsi_Host *host)
 
         scsi_eh_flush_done_q(&ap->eh_done_q);
 
+        spin_lock_irqsave(&ap->host_set->lock, flags);
+        ap->flags &= ~ATA_FLAG_IN_EH;
+        spin_unlock_irqrestore(&ap->host_set->lock, flags);
+
         DPRINTK("EXIT\n");
         return 0;
 }