[PATCH -next v3 1/2] device property: Return -ENXIO if there is no suitable FW interface

[PATCH -next v3 1/2] device property: Return -ENXIO if there is no suitable FW interface

[Guenter Roeck]

Return -ENXIO if device property array access functions don't find
a suitable firmware interface.

This lets drivers decide if they should use available platform data
instead.

Cc: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
---
v2: Added patch
v3: Document that device_property_read_string_array and
    device_property_read_string can also return -ENXIO.
    Move check if there is pset data, and thus detection if there is
    a suitable firmwawre interface, out of pset_prop_read_array into
    the calling code.

 drivers/base/property.c | 17 +++++++++++++----
 1 file changed, 13 insertions(+), 4 deletions(-)

diff --git a/drivers/base/property.c b/drivers/base/property.c
index 287704d680bf..caf937af98b3 100644
--- a/drivers/base/property.c
+++ b/drivers/base/property.c
@@ -156,6 +156,7 @@ EXPORT_SYMBOL_GPL(fwnode_property_present);
  *	   %-ENODATA if the property does not have a value,
  *	   %-EPROTO if the property is not an array of numbers,
  *	   %-EOVERFLOW if the size of the property is not as expected.
+ *	   %-ENXIO if no suitable firmware interface is present.
  */
 int device_property_read_u8_array(struct device *dev, const char *propname,
 				  u8 *val, size_t nval)
@@ -180,6 +181,7 @@ EXPORT_SYMBOL_GPL(device_property_read_u8_array);
  *	   %-ENODATA if the property does not have a value,
  *	   %-EPROTO if the property is not an array of numbers,
  *	   %-EOVERFLOW if the size of the property is not as expected.
+ *	   %-ENXIO if no suitable firmware interface is present.
  */
 int device_property_read_u16_array(struct device *dev, const char *propname,
 				   u16 *val, size_t nval)
@@ -204,6 +206,7 @@ EXPORT_SYMBOL_GPL(device_property_read_u16_array);
  *	   %-ENODATA if the property does not have a value,
  *	   %-EPROTO if the property is not an array of numbers,
  *	   %-EOVERFLOW if the size of the property is not as expected.
+ *	   %-ENXIO if no suitable firmware interface is present.
  */
 int device_property_read_u32_array(struct device *dev, const char *propname,
 				   u32 *val, size_t nval)
@@ -228,6 +231,7 @@ EXPORT_SYMBOL_GPL(device_property_read_u32_array);
  *	   %-ENODATA if the property does not have a value,
  *	   %-EPROTO if the property is not an array of numbers,
  *	   %-EOVERFLOW if the size of the property is not as expected.
+ *	   %-ENXIO if no suitable firmware interface is present.
  */
 int device_property_read_u64_array(struct device *dev, const char *propname,
 				   u64 *val, size_t nval)
@@ -252,6 +256,7 @@ EXPORT_SYMBOL_GPL(device_property_read_u64_array);
  *	   %-ENODATA if the property does not have a value,
  *	   %-EPROTO or %-EILSEQ if the property is not an array of strings,
  *	   %-EOVERFLOW if the size of the property is not as expected.
+ *	   %-ENXIO if no suitable firmware interface is present.
  */
 int device_property_read_string_array(struct device *dev, const char *propname,
 				      const char **val, size_t nval)
@@ -273,6 +278,7 @@ EXPORT_SYMBOL_GPL(device_property_read_string_array);
  *	   %-EINVAL if given arguments are not valid,
  *	   %-ENODATA if the property does not have a value,
  *	   %-EPROTO or %-EILSEQ if the property type is not a string.
+ *	   %-ENXIO if no suitable firmware interface is present.
  */
 int device_property_read_string(struct device *dev, const char *propname,
 				const char **val)
@@ -294,9 +300,11 @@ EXPORT_SYMBOL_GPL(device_property_read_string);
 	else if (is_acpi_node(_fwnode_)) \
 		_ret_ = acpi_dev_prop_read(to_acpi_node(_fwnode_), _propname_, \
 					   _proptype_, _val_, _nval_); \
-	else \
+	else if (is_pset(_fwnode_)) \
 		_ret_ = pset_prop_read_array(to_pset(_fwnode_), _propname_, \
 					     _proptype_, _val_, _nval_); \
+	else \
+		_ret_ = -ENXIO; \
 	_ret_; \
 })
 
@@ -434,9 +442,10 @@ int fwnode_property_read_string_array(struct fwnode_handle *fwnode,
 	else if (is_acpi_node(fwnode))
 		return acpi_dev_prop_read(to_acpi_node(fwnode), propname,
 					  DEV_PROP_STRING, val, nval);
-
-	return pset_prop_read_array(to_pset(fwnode), propname,
-				    DEV_PROP_STRING, val, nval);
+	else if (is_pset(fwnode))
+		return pset_prop_read_array(to_pset(fwnode), propname,
+					    DEV_PROP_STRING, val, nval);
+	return -ENXIO;
 }
 EXPORT_SYMBOL_GPL(fwnode_property_read_string_array);
 
-- 
2.1.4

[PATCH -next v3 2/2] smsc911x: Ignore error return from device_get_phy_mode()

[Guenter Roeck]

Commit 62ee783bf1f8 ("smsc911x: Fix crash seen if neither ACPI nor OF is
configured or used") introduces an error check for the return value from
device_get_phy_mode() and bails out if there is an error. Unfortunately,
there are configurations where no phy is configured. Those configurations
now fail.

To fix the problem, accept error returns from device_get_phy_mode(),
and use the return value from device_property_read_u32() to determine
if there is a suitable firmware interface to read the configuration.

Fixes: 62ee783bf1f8 ("smsc911x: Fix crash seen if neither ACPI nor OF is configured or used")
Tested-by: Tony Lindgren <tony@atomide.com>
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
---
v2: Dropped RFC
    Removed check for -ENODATA
    Depends on patch 1/2
v3: Added Tony's Tested-by:

Tested with non-devicetree and devicetree configurations.
Should be tested with ACPI configuration.

 drivers/net/ethernet/smsc/smsc911x.c | 14 ++++++++------
 1 file changed, 8 insertions(+), 6 deletions(-)

diff --git a/drivers/net/ethernet/smsc/smsc911x.c b/drivers/net/ethernet/smsc/smsc911x.c
index 6eef3251d833..c8b26259c9cf 100644
--- a/drivers/net/ethernet/smsc/smsc911x.c
+++ b/drivers/net/ethernet/smsc/smsc911x.c
@@ -2369,23 +2369,25 @@ static int smsc911x_probe_config(struct smsc911x_platform_config *config,
 {
 	int phy_interface;
 	u32 width = 0;
+	int err;
 
 	phy_interface = device_get_phy_mode(dev);
 	if (phy_interface < 0)
-		return phy_interface;
-
+		phy_interface = PHY_INTERFACE_MODE_NA;
 	config->phy_interface = phy_interface;
 
 	device_get_mac_address(dev, config->mac, ETH_ALEN);
 
-	device_property_read_u32(dev, "reg-shift", &config->shift);
-
-	device_property_read_u32(dev, "reg-io-width", &width);
-	if (width == 4)
+	err = device_property_read_u32(dev, "reg-io-width", &width);
+	if (err == -ENXIO)
+		return err;
+	if (!err && width == 4)
 		config->flags |= SMSC911X_USE_32BIT;
 	else
 		config->flags |= SMSC911X_USE_16BIT;
 
+	device_property_read_u32(dev, "reg-shift", &config->shift);
+
 	if (device_property_present(dev, "smsc,irq-active-high"))
 		config->irq_polarity = SMSC911X_IRQ_POLARITY_ACTIVE_HIGH;
 
-- 
2.1.4

Re: [PATCH -next v3 2/2] smsc911x: Ignore error return from device_get_phy_mode()

[David Miller]

From: Guenter Roeck <linux@roeck-us.net>
Date: Wed, 26 Aug 2015 20:27:05 -0700

> Commit 62ee783bf1f8 ("smsc911x: Fix crash seen if neither ACPI nor OF is
> configured or used") introduces an error check for the return value from
> device_get_phy_mode() and bails out if there is an error. Unfortunately,
> there are configurations where no phy is configured. Those configurations
> now fail.
> 
> To fix the problem, accept error returns from device_get_phy_mode(),
> and use the return value from device_property_read_u32() to determine
> if there is a suitable firmware interface to read the configuration.
> 
> Fixes: 62ee783bf1f8 ("smsc911x: Fix crash seen if neither ACPI nor OF is configured or used")
> Tested-by: Tony Lindgren <tony@atomide.com>
> Signed-off-by: Guenter Roeck <linux@roeck-us.net>

Applied.

Re: [PATCH -next v3 1/2] device property: Return -ENXIO if there is no suitable FW interface

[Jeremy Linton]

On 08/26/2015 10:27 PM, Guenter Roeck wrote:
> Return -ENXIO if device property array access functions don't find
> a suitable firmware interface.
>
> This lets drivers decide if they should use available platform data
> instead.

Works fine on an ACPI based ARM system.

Thanks, for taking care of this.

Tested-by: Jeremy Linton <jeremy.linton@arm.com>

Re: [PATCH -next v3 1/2] device property: Return -ENXIO if there is no suitable FW interface

[David Miller]

From: Guenter Roeck <linux@roeck-us.net>
Date: Wed, 26 Aug 2015 20:27:04 -0700

> Return -ENXIO if device property array access functions don't find
> a suitable firmware interface.
> 
> This lets drivers decide if they should use available platform data
> instead.
> 
> Cc: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
> Signed-off-by: Guenter Roeck <linux@roeck-us.net>

Applied.