linux-kernel - [PATCH 1/3] media: bcm2835-unicam: Fix error handling for platform_get

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Date: Tue, 30 Apr 2024 07:51:26 +0000
From: Ricardo Ribalda <ribalda@...omium.org>
To: Mauro Carvalho Chehab <mchehab@...nel.org>, 
 Florian Fainelli <florian.fainelli@...adcom.com>, 
 Broadcom internal kernel review list <bcm-kernel-feedback-list@...adcom.com>, 
 Ray Jui <rjui@...adcom.com>, Scott Branden <sbranden@...adcom.com>
Cc: linux-media@...r.kernel.org, linux-rpi-kernel@...ts.infradead.org, 
 linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org, 
 Hans Verkuil <hverkuil@...all.nl>, Ricardo Ribalda <ribalda@...omium.org>
Subject: [PATCH 1/3] media: bcm2835-unicam: Fix error handling for
 platform_get_irq

platform_get_irq() cannot return the value 0.

If it returns -EPROBE_DEFER, we need to populate the error code upwards
to retry probing once the irq handler is ready.

Signed-off-by: Ricardo Ribalda <ribalda@...omium.org>
---
 drivers/media/platform/broadcom/bcm2835-unicam.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/drivers/media/platform/broadcom/bcm2835-unicam.c b/drivers/media/platform/broadcom/bcm2835-unicam.c
index bd2bbb53070e..2a3a27ac70ba 100644
--- a/drivers/media/platform/broadcom/bcm2835-unicam.c
+++ b/drivers/media/platform/broadcom/bcm2835-unicam.c
@@ -2660,9 +2660,10 @@ static int unicam_probe(struct platform_device *pdev)
 	}
 
 	ret = platform_get_irq(pdev, 0);
-	if (ret <= 0) {
+	if (ret < 0) {
 		dev_err(&pdev->dev, "No IRQ resource\n");
-		ret = -EINVAL;
+		if (ret != -EPROBE_DEFER)
+			ret = -EINVAL;
 		goto err_unicam_put;
 	}
 

-- 
2.44.0.769.g3c40516874-goog