linux-kernel - [PATCH] Bluetooth: hci_bcm: Check for error irq

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Message-Id: <20211224025318.1541232-1-jiasheng@iscas.ac.cn>
Date:   Fri, 24 Dec 2021 10:53:18 +0800
From:   Jiasheng Jiang <jiasheng@...as.ac.cn>
To:     marcel@...tmann.org, johan.hedberg@...il.com, luiz.dentz@...il.com
Cc:     linux-bluetooth@...r.kernel.org, linux-kernel@...r.kernel.org,
        Jiasheng Jiang <jiasheng@...as.ac.cn>
Subject: [PATCH] Bluetooth: hci_bcm: Check for error irq

For the possible failure of the platform_get_irq(), the returned irq
could be error number and will finally cause the failure of the
request_irq().
Consider that platform_get_irq() can now in certain cases return
-EPROBE_DEFER, and the consequences of letting request_irq() effectively
convert that into -EINVAL, even at probe time rather than later on.
So it might be better to check just now.

Fixes: 0395ffc1ee05 ("Bluetooth: hci_bcm: Add PM for BCM devices")
Signed-off-by: Jiasheng Jiang <jiasheng@...as.ac.cn>
---
 drivers/bluetooth/hci_bcm.c | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/drivers/bluetooth/hci_bcm.c b/drivers/bluetooth/hci_bcm.c
index 3cd57fc56ade..3f939fe89998 100644
--- a/drivers/bluetooth/hci_bcm.c
+++ b/drivers/bluetooth/hci_bcm.c
@@ -1182,7 +1182,12 @@ static int bcm_probe(struct platform_device *pdev)
 		return -ENOMEM;
 
 	dev->dev = &pdev->dev;
-	dev->irq = platform_get_irq(pdev, 0);
+
+	ret = platform_get_irq(pdev, 0);
+	if (ret < 0)
+		return ret;
+
+	dev->irq = ret;
 
 	/* Initialize routing field to an unused value */
 	dev->pcm_int_params[0] = 0xff;
-- 
2.25.1