[PATCH 5.4.y] mfd: vexpress-sysreg: Check the return value of devm_gpiochip_add_data()

[Sasha Levin <sashal@kernel.org>]

From: Bartosz Golaszewski <bartosz.golaszewski@linaro.org>

[ Upstream commit 1efbee6852f1ff698a9981bd731308dd027189fb ]

Commit 974cc7b93441 ("mfd: vexpress: Define the device as MFD cells")
removed the return value check from the call to gpiochip_add_data() (or
rather gpiochip_add() back then and later converted to devres) with no
explanation. This function however can still fail, so check the return
value and bail-out if it does.

Cc: stable@vger.kernel.org
Fixes: 974cc7b93441 ("mfd: vexpress: Define the device as MFD cells")
Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@linaro.org>
Reviewed-by: Linus Walleij <linus.walleij@linaro.org>
Link: https://lore.kernel.org/r/20250811-gpio-mmio-mfd-conv-v1-1-68c5c958cf80@linaro.org
Signed-off-by: Lee Jones <lee@kernel.org>
[ Use non-devm variants ]
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 drivers/mfd/vexpress-sysreg.c | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/drivers/mfd/vexpress-sysreg.c b/drivers/mfd/vexpress-sysreg.c
index c68ff56dbdb12..1463cf43687df 100644
--- a/drivers/mfd/vexpress-sysreg.c
+++ b/drivers/mfd/vexpress-sysreg.c
@@ -160,6 +160,7 @@ static int vexpress_sysreg_probe(struct platform_device *pdev)
 	struct gpio_chip *mmc_gpio_chip;
 	int master;
 	u32 dt_hbi;
+	int ret;
 
 	mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 	if (!mem)
@@ -195,7 +196,10 @@ static int vexpress_sysreg_probe(struct platform_device *pdev)
 	bgpio_init(mmc_gpio_chip, &pdev->dev, 0x4, base + SYS_MCI,
 			NULL, NULL, NULL, NULL, 0);
 	mmc_gpio_chip->ngpio = 2;
-	gpiochip_add_data(mmc_gpio_chip, NULL);
+
+	ret = gpiochip_add_data(mmc_gpio_chip, NULL);
+	if (ret)
+		return ret;
 
 	return mfd_add_devices(&pdev->dev, PLATFORM_DEVID_AUTO,
 			vexpress_sysreg_cells,
-- 
2.51.0