[PATCH 2/4] staging: dgap: implement proper error handling in dgap_firmware_load()

[Daeseok Youn <daeseok.youn@gmail.com>]

When dgap_tty_init() and dgap_tty_register_ports() are failed,
these are needed to free some memory properly.

It can be handled by calling dgap_tty_uninit() and dgap_cleanup_board().
But tty's ports are not registered yet when these function are failed,
so brd->nasync set to zero.

Signed-off-by: Daeseok Youn <daeseok.youn@gmail.com>
---
 drivers/staging/dgap/dgap.c |   21 ++++++++++++++++-----
 1 files changed, 16 insertions(+), 5 deletions(-)

diff --git a/drivers/staging/dgap/dgap.c b/drivers/staging/dgap/dgap.c
index 60b7d70..db24f70 100644
--- a/drivers/staging/dgap/dgap.c
+++ b/drivers/staging/dgap/dgap.c
@@ -954,19 +954,30 @@ static int dgap_firmware_load(struct pci_dev *pdev, int card_type)
 	 * Do tty device initialization.
 	 */
 	ret = dgap_tty_init(brd);
-	if (ret < 0) {
-		dgap_tty_uninit(brd);
-		return ret;
-	}
+	if (ret < 0)
+		goto err_cleanup;
 
 	ret = dgap_tty_register_ports(brd);
 	if (ret)
-		return ret;
+		goto err_cleanup;
 
 	brd->state = BOARD_READY;
 	brd->dpastatus = BD_RUNNING;
 
 	return 0;
+
+err_cleanup:
+	/*
+	 * Clear nasync to zero for avoiding to call
+	 * some destroyer for tty's ports which are not
+	 * registered yet in dgap_tty_uninit().
+	 */
+	brd->nasync = 0;
+
+	dgap_tty_uninit(brd);
+	dgap_cleanup_board(brd);
+	return ret;
+
 }
 
 /*
-- 
1.7.1