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Message-ID: <3e64fe592dc99e27ef9a0b247fc49fa26b6b8a58.1685340157.git.mazziesaccount@gmail.com>
Date: Mon, 29 May 2023 09:22:33 +0300
From: Matti Vaittinen <mazziesaccount@...il.com>
To: Matti Vaittinen <mazziesaccount@...il.com>,
Matti Vaittinen <matti.vaittinen@...rohmeurope.com>
Cc: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
Daniel Scally <djrscally@...il.com>,
Heikki Krogerus <heikki.krogerus@...ux.intel.com>,
Sakari Ailus <sakari.ailus@...ux.intel.com>,
Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
"Rafael J. Wysocki" <rafael@...nel.org>,
Wolfram Sang <wsa@...nel.org>,
Lars-Peter Clausen <lars@...afoo.de>,
Michael Hennerich <Michael.Hennerich@...log.com>,
Jonathan Cameron <jic23@...nel.org>,
Andreas Klinger <ak@...klinger.de>,
Marcin Wojtas <mw@...ihalf.com>,
Russell King <linux@...linux.org.uk>,
"David S. Miller" <davem@...emloft.net>,
Eric Dumazet <edumazet@...gle.com>,
Jakub Kicinski <kuba@...nel.org>,
Paolo Abeni <pabeni@...hat.com>,
Jonathan Neuschäfer <j.neuschaefer@....net>,
Linus Walleij <linus.walleij@...aro.org>,
Paul Cercueil <paul@...pouillou.net>,
Akhil R <akhilrajeev@...dia.com>, linux-acpi@...r.kernel.org,
linux-kernel@...r.kernel.org, linux-i2c@...r.kernel.org,
linux-iio@...r.kernel.org, netdev@...r.kernel.org,
openbmc@...ts.ozlabs.org, linux-gpio@...r.kernel.org,
linux-mips@...r.kernel.org
Subject: [PATCH v7 1/9] drivers: fwnode: fix fwnode_irq_get[_byname]()
The fwnode_irq_get() and the fwnode_irq_get_byname() return 0 upon
device-tree IRQ mapping failure. This is contradicting the
fwnode_irq_get_byname() 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 make also the
fwnode_irq_get() follow same common convention returning a negative errno
upon failure.
Fixes: ca0acb511c21 ("device property: Add fwnode_irq_get_byname")
Suggested-by: Sakari Ailus <sakari.ailus@...ux.intel.com>
Suggested-by: Jonathan Cameron <jic23@...nel.org>
Signed-off-by: Matti Vaittinen <mazziesaccount@...il.com>
Reviewed-by: Andy Shevchenko <andy.shevchenko@...il.com>
Reviewed-by: Jonathan Cameron <Jonathan.Cameron@...wei.com>
---
Revision history:
v4 =>:
- No Changes
v3 => v4:
- Change also the fwnode_irq_get()
---
drivers/base/property.c | 12 +++++++++---
1 file changed, 9 insertions(+), 3 deletions(-)
diff --git a/drivers/base/property.c b/drivers/base/property.c
index f6117ec9805c..8c40abed7852 100644
--- a/drivers/base/property.c
+++ b/drivers/base/property.c
@@ -987,12 +987,18 @@ EXPORT_SYMBOL(fwnode_iomap);
* @fwnode: Pointer to the firmware node
* @index: Zero-based index of the IRQ
*
- * Return: Linux IRQ number on success. Other values are determined
- * according to acpi_irq_get() or of_irq_get() operation.
+ * Return: Linux IRQ number on success. Negative errno on failure.
*/
int fwnode_irq_get(const struct fwnode_handle *fwnode, unsigned int index)
{
- return fwnode_call_int_op(fwnode, irq_get, index);
+ int ret;
+
+ ret = fwnode_call_int_op(fwnode, irq_get, index);
+ /* We treat mapping errors as invalid case */
+ if (ret == 0)
+ return -EINVAL;
+
+ return ret;
}
EXPORT_SYMBOL(fwnode_irq_get);
--
2.40.1
--
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 =]
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