[PATCH 3/3] spi: Warn when a driver's remove callback returns an error

["Uwe Kleine-König" <u.kleine-koenig@pengutronix.de>]

The driver core ignores the return value of struct device_driver::remove
(because in general there is nothing that can be done about that). So
add a warning when an spi driver returns an error.

This simplifies the quest to make struct device_driver::remove return void.
A consequent change would be to make struct spi_driver::remove return void,
but I'm keeping this quest for later (or someone else).

Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
---
 drivers/spi/spi.c | 13 ++++++++++---
 1 file changed, 10 insertions(+), 3 deletions(-)

diff --git a/drivers/spi/spi.c b/drivers/spi/spi.c
index e8c0a000ee19..6b7c19bf7715 100644
--- a/drivers/spi/spi.c
+++ b/drivers/spi/spi.c
@@ -408,13 +408,20 @@ static int spi_probe(struct device *dev)
 static int spi_remove(struct device *dev)
 {
 	const struct spi_driver		*sdrv = to_spi_driver(dev->driver);
-	int ret = 0;
 
-	if (sdrv->remove)
+	if (sdrv->remove) {
+		int ret;
+
 		ret = sdrv->remove(to_spi_device(dev));
+		if (ret)
+			dev_warn(dev,
+				 "Failed to unbind driver (%pe), ignoring\n",
+				 ERR_PTR(ret));
+	}
+
 	dev_pm_domain_detach(dev, true);
 
-	return ret;
+	return 0;
 }
 
 static void spi_shutdown(struct device *dev)
-- 
2.28.0