linux-kernel - [PATCH 2/3] tty: serial: fsl_lpuart: fix return value checking

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Date:   Tue, 24 Mar 2020 19:47:57 +0100
From:   Michael Walle <michael@...le.cc>
To:     linux-serial@...r.kernel.org, linux-kernel@...r.kernel.org
Cc:     Jiri Slaby <jslaby@...e.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Michael Walle <michael@...le.cc>,
        Leonard Crestez <leonard.crestez@....com>
Subject: [PATCH 2/3] tty: serial: fsl_lpuart: fix return value checking

The return value of lpuart_dma_tx_request() is a 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@....com>
Signed-off-by: Michael Walle <michael@...le.cc>
---
 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 960fc2658f19..bbba298b68a4 100644
--- a/drivers/tty/serial/fsl_lpuart.c
+++ b/drivers/tty/serial/fsl_lpuart.c
@@ -1522,7 +1522,7 @@ static void lpuart_tx_dma_startup(struct lpuart_port *sport)
 	}
 
 	ret = lpuart_dma_tx_request(&sport->port);
-	if (!ret)
+	if (ret)
 		goto err;
 
 	init_waitqueue_head(&sport->dma_wait);
-- 
2.20.1