[PATCH v2 1/3] mmc: meson-gx: Handle errors from optional IRQ lookup

[phucduc . bui]

From: bui duc phuc <phucduc.bui@xxxxxxxxx>

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.

However, the driver currently stores the return value directly in
cd_irq and continues probing.

Propagate negative errors other than -ENXIO, and only assign the IRQ to
cd_irq when a valid IRQ number is returned.

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

Changes in v2:
 - Initialize cd_irq to -ENXIO.

 drivers/mmc/host/meson-gx-mmc.c | 9 +++++++--
 1 file changed, 7 insertions(+), 2 deletions(-)

diff --git a/drivers/mmc/host/meson-gx-mmc.c b/drivers/mmc/host/meson-gx-mmc.c
index 694bb443d5f3..d2903e3dfd6f 100644
--- a/drivers/mmc/host/meson-gx-mmc.c
+++ b/drivers/mmc/host/meson-gx-mmc.c
@@ -1141,7 +1141,8 @@ static int meson_mmc_probe(struct platform_device *pdev)
 	struct meson_host *host;
 	struct mmc_host *mmc;
 	struct clk *core_clk;
-	int cd_irq, ret;
+	int cd_irq = -ENXIO;
+	int ret;
 
 	mmc = devm_mmc_alloc_host(&pdev->dev, sizeof(struct meson_host));
 	if (!mmc)
@@ -1185,7 +1186,11 @@ static int meson_mmc_probe(struct platform_device *pdev)
 	if (host->irq < 0)
 		return host->irq;
 
-	cd_irq = platform_get_irq_optional(pdev, 1);
+	ret = platform_get_irq_optional(pdev, 1);
+	if (ret < 0 && ret != -ENXIO)
+		return ret;
+	if (ret > 0)
+		cd_irq = ret;
 	mmc_gpio_set_cd_irq(mmc, cd_irq);
 
 	host->pinctrl = devm_pinctrl_get(&pdev->dev);
-- 
2.43.0