Messages in this thread Patch in this message | | | Date | Tue, 25 Oct 2022 18:11:49 +0300 | From | Matti Vaittinen <> | Subject | [PATCH v2 1/2] drivers: fwnode: fix fwnode_irq_get_byname() |
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The fwnode_irq_get_byname() does return 0 upon device-tree IRQ mapping failure. This is contradicting the function documentation and can potentially be a source of errors like:
int probe(...) { ...
irq = fwnode_irq_get_byname(); if (irq <= 0) return irq;
... }
Here we do correctly check the return value from fwnode_irq_get_byname() but the driver probe will now return success. (There was already one such user in-tree).
Change the fwnode_irq_get_byname() to work as documented and according to the common convention and abd always return a negative errno upon failure.
Fixes: ca0acb511c21 ("device property: Add fwnode_irq_get_byname") Suggested-by: Sakari Ailus <sakari.ailus@linux.intel.com> Signed-off-by: Matti Vaittinen <mazziesaccount@gmail.com> Reviewed-by: Sakari Ailus <sakari.ailus@linux.intel.com> Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
--- v1 => v2: - change check if (!ret) => if (ret == 0), add comment. - fix drop redundant empty line.
I did a quick audit for the callers at v6.1-rc2: drivers/i2c/i2c-smbus.c drivers/iio/accel/adxl355_core.c drivers/iio/gyro/fxas21002c_core.c drivers/iio/imu/adis16480.c drivers/iio/imu/bmi160/bmi160_core.c drivers/iio/imu/bmi160/bmi160_core.c
I did not spot any errors to be caused by this change. There will be a functional change in i2c-smbus.c as the probe will now return -EINVAL should the IRQ dt-mapping fail. It'd be nice if this was checked to be Ok by the peeps knowing the i2c-smbus :) --- drivers/base/property.c | 9 +++++++-- 1 file changed, 7 insertions(+), 2 deletions(-)
diff --git a/drivers/base/property.c b/drivers/base/property.c index 4d6278a84868..b4ccc64f7bd2 100644 --- a/drivers/base/property.c +++ b/drivers/base/property.c @@ -964,7 +964,7 @@ EXPORT_SYMBOL(fwnode_irq_get); */ int fwnode_irq_get_byname(const struct fwnode_handle *fwnode, const char *name) { - int index; + int index, ret; if (!name) return -EINVAL; @@ -973,7 +973,12 @@ int fwnode_irq_get_byname(const struct fwnode_handle *fwnode, const char *name) if (index < 0) return index; - return fwnode_irq_get(fwnode, index); + ret = fwnode_irq_get(fwnode, index); + /* We treat mapping errors as invalid case */ + if (ret == 0) + return -EINVAL; + + return ret; } EXPORT_SYMBOL(fwnode_irq_get_byname); -- 2.37.3
-- Matti Vaittinen, Linux device drivers ROHM Semiconductors, Finland SWDC Kiviharjunlenkki 1E 90220 OULU FINLAND
~~~ "I don't think so," said Rene Descartes. Just then he vanished ~~~ Simon says - in Latin please. ~~~ "non cogito me" dixit Rene Descarte, deinde evanescavit ~~~ Thanks to Simon Glass for the translation =] [unhandled content-type:application/pgp-signature] | |