linux-kernel - [PATCH 5.4 32/43] slimbus: qcom: Fix IRQ check in qcom_slim

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Message-Id: <20220516193615.666836040@linuxfoundation.org>
Date:   Mon, 16 May 2022 21:36:43 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Miaoqian Lin <linmq006@...il.com>,
        Srinivas Kandagatla <srinivas.kandagatla@...aro.org>
Subject: [PATCH 5.4 32/43] slimbus: qcom: Fix IRQ check in qcom_slim_probe

From: Miaoqian Lin <linmq006@...il.com>

commit fe503887eed6ea528e144ec8dacfa1d47aa701ac upstream.

platform_get_irq() returns non-zero IRQ number on success,
negative error number on failure.
And the doc of platform_get_irq() provides a usage example:

    int irq = platform_get_irq(pdev, 0);
    if (irq < 0)
        return irq;

Fix the check of return value to catch errors correctly.

Fixes: ad7fcbc308b0 ("slimbus: qcom: Add Qualcomm Slimbus controller driver")
Cc: stable@...r.kernel.org
Signed-off-by: Miaoqian Lin <linmq006@...il.com>
Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@...aro.org>
Link: https://lore.kernel.org/r/20220429164917.5202-2-srinivas.kandagatla@linaro.org
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 drivers/slimbus/qcom-ctrl.c |    4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

--- a/drivers/slimbus/qcom-ctrl.c
+++ b/drivers/slimbus/qcom-ctrl.c
@@ -515,9 +515,9 @@ static int qcom_slim_probe(struct platfo
 	}
 
 	ctrl->irq = platform_get_irq(pdev, 0);
-	if (!ctrl->irq) {
+	if (ctrl->irq < 0) {
 		dev_err(&pdev->dev, "no slimbus IRQ\n");
-		return -ENODEV;
+		return ctrl->irq;
 	}
 
 	sctrl = &ctrl->ctrl;