The error cases of mediatek_gpio_bank_probe() would go unnoticed (except
for the dev_err() messages). The probe function should return an error
if one of the banks failed to initialize properly.

Signed-off-by: Nicholas Mc Guire <redacted>
Fixes: 4ba9c3afda41 ("gpio: mt7621: Add a driver for MT7621")
---

Patch was compile tested with: omega2p_defconfig, SOC_MT7621=y,
GPIOLIB=y, GPIO_MT7621=y

Patch is against 4.20-rc3 (localversion-next is next-20181121)

 drivers/gpio/gpio-mt7621.c | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/drivers/gpio/gpio-mt7621.c b/drivers/gpio/gpio-mt7621.c
index 1ec95bc..68fca8b 100644
--- a/drivers/gpio/gpio-mt7621.c
+++ b/drivers/gpio/gpio-mt7621.c

@@ -297,6 +297,7 @@ mediatek_gpio_probe(struct platform_device *pdev)
        struct device_node *np = dev->of_node;
        struct mtk *mtk;
        int i;
+       int ret;

        mtk = devm_kzalloc(dev, sizeof(*mtk), GFP_KERNEL);
        if (!mtk)

@@ -311,8 +312,11 @@ mediatek_gpio_probe(struct platform_device *pdev)
        platform_set_drvdata(pdev, mtk);
        mediatek_gpio_irq_chip.name = dev_name(dev);

-       for (i = 0; i < MTK_BANK_CNT; i++)
-               mediatek_gpio_bank_probe(dev, np, i);
+       for (i = 0; i < MTK_BANK_CNT; i++) {
+               ret = mediatek_gpio_bank_probe(dev, np, i);
+               if (!ret)
+                       return ret;
+       }