[PATCH v5 8/8] i2c: i2c-smbus: fwnode_irq_get_byname() return value fix

Matti Vaittinen
2023-05-19T11:05:49Z

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The fwnode_irq_get_byname() was changed to not return 0 upon failure so
return value check can be adjusted to reflect the change.

Reviewed-by: Sakari Ailus <sakari.ailus@linux.intel.com>
Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Signed-off-by: Matti Vaittinen <mazziesaccount@gmail.com>

---
Revision history:
v4 => v5:
- Added back after this was accidentally dropped at v4.

Depends on the mentioned return value change which is in patch 1/2. The
return value change does also cause a functional change here. Eg. when
IRQ mapping fails, the fwnode_irq_get_byname() no longer returns zero.
This will cause also the probe here to return nonzero failure. I guess
this is desired behaviour - but I would appreciate any confirmation.

Please, see also previous discussion here:
https://lore.kernel.org/all/fbd52f5f5253b382b8d7b3e8046134de29f965b8.1666710197.git.mazziesaccount@gmail.com/

Another suggestion has been to drop the check altogether. I am slightly
reluctant on doing that unless it gets confirmed that is the "right
thing to do".
---
drivers/i2c/i2c-smbus.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/i2c/i2c-smbus.c b/drivers/i2c/i2c-smbus.c
index 138c3f5e0093..893fe7cd3e41 100644
--- a/drivers/i2c/i2c-smbus.c
+++ b/drivers/i2c/i2c-smbus.c
@@ -129,7 +129,7 @@ static int smbalert_probe(struct i2c_client *ara)
} else {
irq = fwnode_irq_get_byname(dev_fwnode(adapter->dev.parent),
"smbus_alert");
- if (irq <= 0)
+ if (irq < 0)
return irq;
}