From: Michael Walle <michael@walle.cc>
Date: Wed, 25 Mar 2020 10:06:58 +0100
Subject: tty: serial: fsl_lpuart: fix return value checking
Git-commit: d7c53fb081c6347675bcd6fc4a9306111c42c111
Patch-mainline: v5.7-rc1
References: jsc#SLE-12251
The return value of lpuart_dma_tx_request() is an negative errno on
failure and zero on success.
Fixes: 159381df1442f ("tty: serial: fsl_lpuart: fix DMA operation when using IOMMU")
Reported-by: Leonard Crestez <leonard.crestez@nxp.com>
Signed-off-by: Michael Walle <michael@walle.cc>
Reviewed-by: Fugang Duan <fugang.duan@nxp.com>
Link: https://lore.kernel.org/r/20200325090658.25967-2-michael@walle.cc
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Mian Yousaf Kaukab <yousaf.kaukab@suse.com>
---
drivers/tty/serial/fsl_lpuart.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/drivers/tty/serial/fsl_lpuart.c b/drivers/tty/serial/fsl_lpuart.c
index 131018979b77..5d41075964f2 100644
--- a/drivers/tty/serial/fsl_lpuart.c
+++ b/drivers/tty/serial/fsl_lpuart.c
@@ -1538,7 +1538,7 @@ static void lpuart_tx_dma_startup(struct lpuart_port *sport)
goto err;
ret = lpuart_dma_tx_request(&sport->port);
- if (!ret)
+ if (ret)
goto err;
init_waitqueue_head(&sport->dma_wait);
--
2.26.2