From: phucduc.bui@gmail.com
To: Bjorn Andersson <andersson@kernel.org>,
	Konrad Dybcio <konradybcio@kernel.org>
Cc: linux-arm-msm@vger.kernel.org,
	linux-kernel@vger.kernel.org,
	bui duc phuc <phucduc.bui@gmail.com>
Subject: [PATCH v2] soc: qcom: llcc-qcom: Handle errors from optional IRQ lookup
Date: Wed, 19 Aug 2026 17:26:30 +0700
Message-ID: <20260819102630.68991-1-phucduc.bui@gmail.com>
Precedence: bulk
MIME-Version: 1.0
Content-Transfer-Encoding: 8bit

From: bui duc phuc <phucduc.bui@gmail.com>

platform_get_irq_optional() returns a positive IRQ number on success or
a negative error code on failure. For an optional IRQ, -ENXIO indicates
that no optional IRQ is available. Other errors, such as -EPROBE_DEFER
and -EINVAL, should be propagated so that the caller can handle them
appropriately.

Propagate negative errors other than -ENXIO.

Signed-off-by: bui duc phuc <phucduc.bui@gmail.com>
---

Link v1:
https://lore.kernel.org/all/20260810051031.26656-1-phucduc.bui@gmail.com/

Changes in v2:
 - Drop the unnecessary check for a positive return value.
 - Update the commit message to reflect the existing error handling.

 drivers/soc/qcom/llcc-qcom.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/drivers/soc/qcom/llcc-qcom.c b/drivers/soc/qcom/llcc-qcom.c
index 733999867bbf..b166d45cdb6f 100644
--- a/drivers/soc/qcom/llcc-qcom.c
+++ b/drivers/soc/qcom/llcc-qcom.c
@@ -5617,6 +5617,10 @@ static int qcom_llcc_probe(struct platform_device *pdev)
 	}
 
 	drv_data->ecc_irq = platform_get_irq_optional(pdev, 0);
+	if (drv_data->ecc_irq < 0 && drv_data->ecc_irq != -ENXIO)
+		return dev_err_probe(&pdev->dev, drv_data->ecc_irq,
+				     "failed to get IRQ resource\n");
+
 	drv_data->edac_reg_offset = cfg->edac_reg_offset;
 	drv_data->ecc_irq_configured = cfg->irq_configured;
 	drv_data->dev = dev;
-- 
2.43.0