[scsi] Make SCSI command issuing partially asynchronous

Move the icky call to step() from iscsi.c to scsi.c; this takes it at
least one step further away from where it really doesn't belong.

1 files changed, 11 insertions, 18 deletions

diff --git a/src/net/tcp/iscsi.c b/src/net/tcp/iscsi.c
index 943bdefc..0f7b0de5 100644
--- a/src/net/tcp/iscsi.c
+++ b/src/net/tcp/iscsi.c
@@ -182,9 +182,10 @@ static void iscsi_close_connection ( struct iscsi_session *iscsi, int rc ) {
 static void iscsi_scsi_done ( struct iscsi_session *iscsi, int rc ) {
 
 	assert ( iscsi->tx_state == ISCSI_TX_IDLE );
+	assert ( iscsi->command != NULL );
 
+	iscsi->command->rc = rc;
 	iscsi->command = NULL;
-	iscsi->rc = rc;
 }
 
 /****************************************************************************
@@ -1550,32 +1551,24 @@ static int iscsi_command ( struct scsi_device *scsi,
 		container_of ( scsi->backend, struct iscsi_session, refcnt );
 	int rc;
 
+	/* Abort immediately if we have a recorded permanent failure */
+	if ( iscsi->instant_rc )
+		return iscsi->instant_rc;
+
 	/* Record SCSI command */
 	iscsi->command = command;
 
-	/* Abort immediately if we have a recorded permanent failure */
-	if ( iscsi->instant_rc ) {
-		rc = iscsi->instant_rc;
-		goto done;
-	}
-
 	/* Issue command or open connection as appropriate */
 	if ( iscsi->status ) {
 		iscsi_start_command ( iscsi );
 	} else {
-		if ( ( rc = iscsi_open_connection ( iscsi ) ) != 0 )
-			goto done;
+		if ( ( rc = iscsi_open_connection ( iscsi ) ) != 0 ) {
+			iscsi->command = NULL;
+			return rc;
+		}
 	}
 
-	/* Wait for command to complete */
-	iscsi->rc = -EINPROGRESS;
-	while ( iscsi->rc == -EINPROGRESS )
-		step();
-	rc = iscsi->rc;
-
- done:
-	iscsi->command = NULL;
-	return rc;
+	return 0;
 }
 
 static int iscsi_detached_command ( struct scsi_device *scsi __unused,