[PATCH 5.17 0717/1126] pps: clients: gpio: Propagate return value from pps_gpio_probe

From: Greg Kroah-Hartman
Date: Tue Apr 05 2022 - 05:50:59 EST

From: Robert Hancock <robert.hancock@xxxxxxxxxx>

[ Upstream commit abaca3179b41d4b3b115f27814ee36f6fb45e897 ]

If the pps-gpio driver was probed prior to the GPIO device it uses, the
devm_gpiod_get call returned an -EPROBE_DEFER error, but pps_gpio_probe
replaced that error code with -EINVAL, causing the pps-gpio probe to
fail and not be retried later. Propagate the error return value so that
deferred probe works properly.

Fixes: 161520451dfa (pps: new client driver using GPIO)
Reviewed-by: Andy Shevchenko <andriy.shevchenko@xxxxxxxxxxxxxxx>
Acked-by: Rodolfo Giometti <giometti@xxxxxxxxxxxx>
Signed-off-by: Robert Hancock <robert.hancock@xxxxxxxxxx>
Signed-off-by: Rodolfo Giometti <giometti@xxxxxxxxxxxx>
Link: https://lore.kernel.org/r/20220112205214.2060954-1-robert.hancock@xxxxxxxxxx
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
drivers/pps/clients/pps-gpio.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/pps/clients/pps-gpio.c b/drivers/pps/clients/pps-gpio.c
index 35799e6401c9..2f4b11b4dfcd 100644
--- a/drivers/pps/clients/pps-gpio.c
+++ b/drivers/pps/clients/pps-gpio.c
@@ -169,7 +169,7 @@ static int pps_gpio_probe(struct platform_device *pdev)
/* GPIO setup */
ret = pps_gpio_setup(dev);
if (ret)
- return -EINVAL;
+ return ret;

/* IRQ setup */
ret = gpiod_to_irq(data->gpio_pin);