linux-kernel - [PATCH 03/10] serial: 8250_bcm7271: Propagate error codes from brcmuart

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Date:   Fri, 24 Dec 2021 14:29:09 +0000
From:   Lad Prabhakar <prabhakar.mahadev-lad.rj@...renesas.com>
To:     linux-serial@...r.kernel.org, Al Cooper <alcooperx@...il.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Jiri Slaby <jirislaby@...nel.org>
Cc:     Rob Herring <robh+dt@...nel.org>, linux-kernel@...r.kernel.org,
        Prabhakar <prabhakar.csengg@...il.com>,
        Lad Prabhakar <prabhakar.mahadev-lad.rj@...renesas.com>,
        bcm-kernel-feedback-list@...adcom.com
Subject: [PATCH 03/10] serial: 8250_bcm7271: Propagate error codes from brcmuart_probe()

In case of failures brcmuart_probe() always returned -ENODEV, this
isn't correct for example platform_get_irq_byname() may return
-EPROBE_DEFER to handle such cases propagate error codes in
brcmuart_probe() in case of failures.

Fixes: 41a469482de25 ("serial: 8250: Add new 8250-core based Broadcom STB driver")
Signed-off-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@...renesas.com>
---
 drivers/tty/serial/8250/8250_bcm7271.c | 11 ++++++++---
 1 file changed, 8 insertions(+), 3 deletions(-)

diff --git a/drivers/tty/serial/8250/8250_bcm7271.c b/drivers/tty/serial/8250/8250_bcm7271.c
index 7ecfcc650d28..cc60a7874e8b 100644
--- a/drivers/tty/serial/8250/8250_bcm7271.c
+++ b/drivers/tty/serial/8250/8250_bcm7271.c
@@ -1074,14 +1074,18 @@ static int brcmuart_probe(struct platform_device *pdev)
 		priv->rx_bufs = dma_alloc_coherent(dev,
 						   priv->rx_size,
 						   &priv->rx_addr, GFP_KERNEL);
-		if (!priv->rx_bufs)
+		if (!priv->rx_bufs) {
+			ret = -EINVAL;
 			goto err;
+		}
 		priv->tx_size = UART_XMIT_SIZE;
 		priv->tx_buf = dma_alloc_coherent(dev,
 						  priv->tx_size,
 						  &priv->tx_addr, GFP_KERNEL);
-		if (!priv->tx_buf)
+		if (!priv->tx_buf) {
+			ret = -EINVAL;
 			goto err;
+		}
 	}
 
 	ret = serial8250_register_8250_port(&up);
@@ -1095,6 +1099,7 @@ static int brcmuart_probe(struct platform_device *pdev)
 	if (priv->dma_enabled) {
 		dma_irq = platform_get_irq_byname(pdev,  "dma");
 		if (dma_irq < 0) {
+			ret = dma_irq;
 			dev_err(dev, "no IRQ resource info\n");
 			goto err1;
 		}
@@ -1114,7 +1119,7 @@ static int brcmuart_probe(struct platform_device *pdev)
 err:
 	brcmuart_free_bufs(dev, priv);
 	brcmuart_arbitration(priv, 0);
-	return -ENODEV;
+	return ret;
 }
 
 static int brcmuart_remove(struct platform_device *pdev)
-- 
2.17.1