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[v7,3/9] iio: cdc: ad7150: relax return value check for IRQ get

Message ID d080e384f9122349b86780b35496f69e5d995f9b.1685340157.git.mazziesaccount@gmail.com
State Accepted
Commit b20f5801ecbd0903ced7dd4f783dfc2e26204afb
Headers show
Series fix fwnode_irq_get[_byname()] returnvalue | expand

Commit Message

Matti Vaittinen May 29, 2023, 6:23 a.m. UTC 
fwnode_irq_get[_byname]() were changed to not return 0 anymore. The
special error case where device-tree based IRQ mapping fails can't no
longer be reliably detected from this return value. This yields a
functional change in the driver where the mapping failure is treated as
an error.

The mapping failure can occur for example when the device-tree IRQ
information translation call-back(s) (xlate) fail, IRQ domain is not
found, IRQ type conflicts, etc. In most cases this indicates an error in
the device-tree and special handling is not really required.

One more thing to note is that ACPI APIs do not return zero for any
failures so this special handling did only apply on device-tree based
systems.

Drop the special handling for DT mapping failures as these can no longer
be separated from other errors at driver side. Change all failures in
IRQ getting to be handled by continuing without the events instead of
aborting the probe upon certain errors.

Signed-off-by: Matti Vaittinen <mazziesaccount@gmail.com>
Reviewed-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>

---
Revision history:
v5 => v6:
 - Never abort the probe when IRQ getting fails but continue without
   events.

Please note that I don't have the hardware to test this change.
Furthermore, testing this type of device-tree error cases is not
trivial, as the question we probably dive in is "what happens with the
existing users who have errors in the device-tree". Answering to this
question is not simple.

The first patch of the series changes the fwnode_irq_get() so this depends
on the first patch of the series and should not be applied alone.
---
 drivers/iio/cdc/ad7150.c | 10 +++++-----
 1 file changed, 5 insertions(+), 5 deletions(-)
diff mbox series

Patch

diff --git a/drivers/iio/cdc/ad7150.c b/drivers/iio/cdc/ad7150.c
index 79aeb0aaea67..c05e078bba16 100644
--- a/drivers/iio/cdc/ad7150.c
+++ b/drivers/iio/cdc/ad7150.c
@@ -541,6 +541,7 @@  static int ad7150_probe(struct i2c_client *client)
 	const struct i2c_device_id *id = i2c_client_get_device_id(client);
 	struct ad7150_chip_info *chip;
 	struct iio_dev *indio_dev;
+	bool use_irq = true;
 	int ret;
 
 	indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*chip));
@@ -561,14 +562,13 @@  static int ad7150_probe(struct i2c_client *client)
 
 	chip->interrupts[0] = fwnode_irq_get(dev_fwnode(&client->dev), 0);
 	if (chip->interrupts[0] < 0)
-		return chip->interrupts[0];
-	if (id->driver_data == AD7150) {
+		use_irq = false;
+	else if (id->driver_data == AD7150) {
 		chip->interrupts[1] = fwnode_irq_get(dev_fwnode(&client->dev), 1);
 		if (chip->interrupts[1] < 0)
-			return chip->interrupts[1];
+			use_irq = false;
 	}
-	if (chip->interrupts[0] &&
-	    (id->driver_data == AD7151 || chip->interrupts[1])) {
+	if (use_irq) {
 		irq_set_status_flags(chip->interrupts[0], IRQ_NOAUTOEN);
 		ret = devm_request_threaded_irq(&client->dev,
 						chip->interrupts[0],