linux-kernel - [PATCH] tty: serial: uartlite: Support probe deferral

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Date:   Fri, 27 Nov 2020 11:19:53 +0100
From:   Alexander A Sverdlin <alexander.sverdlin@...ia.com>
To:     linux-serial@...r.kernel.org
Cc:     Alexander Sverdlin <alexander.sverdlin@...ia.com>,
        Peter Korsgaard <jacmet@...site.dk>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Jiri Slaby <jirislaby@...nel.org>, linux-kernel@...r.kernel.org
Subject: [PATCH] tty: serial: uartlite: Support probe deferral

From: Alexander Sverdlin <alexander.sverdlin@...ia.com>

Give uartlite a chance to be probed when IRQ controller will be finally
available and return potential -EPROBE_DEFER as-is. The condition "<="
has been changed to "<" to follow the recommendation in the header of
platform_get_irq().

Signed-off-by: Alexander Sverdlin <alexander.sverdlin@...ia.com>
---
 drivers/tty/serial/uartlite.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/tty/serial/uartlite.c b/drivers/tty/serial/uartlite.c
index 09379db..f42ccc4 100644
--- a/drivers/tty/serial/uartlite.c
+++ b/drivers/tty/serial/uartlite.c
@@ -773,8 +773,8 @@ static int ulite_probe(struct platform_device *pdev)
 		return -ENODEV;
 
 	irq = platform_get_irq(pdev, 0);
-	if (irq <= 0)
-		return -ENXIO;
+	if (irq < 0)
+		return irq;
 
 	pdata->clk = devm_clk_get(&pdev->dev, "s_axi_aclk");
 	if (IS_ERR(pdata->clk)) {
-- 
2.10.2