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, assign a phy interface mode of PHY_INTERFACE_MODE_NA
if device_get_phy_mode() returns an error.
Check the return value from device_property_read_u32() to see if there
is a suitable firmware interface to read the data, and abort if not.
The function should return -ENXIO in that case; however, it returns
-ENODATA. Check for both.
Fixes: 62ee783bf1f8 ("smsc911x: Fix crash seen if neither ACPI nor OF is
configured or used")
Signed-off-by: Guenter Roeck <li...@roeck-us.net>
---
Needs testing. RFC because I am not sure if the -ENODATA check is acceptable.
drivers/net/ethernet/smsc/smsc911x.c | 18 ++++++++++++------
1 file changed, 12 insertions(+), 6 deletions(-)
diff --git a/drivers/net/ethernet/smsc/smsc911x.c
b/drivers/net/ethernet/smsc/smsc911x.c
index 6eef3251d833..81e29e420fd0 100644
--- a/drivers/net/ethernet/smsc/smsc911x.c
+++ b/drivers/net/ethernet/smsc/smsc911x.c
@@ -2369,23 +2369,29 @@ 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);
+ /* device_property_read_u32() should return -ENXIO if there is no
+ * suitable firmware interface. In reality it returns -ENODATA.
+ * Check for both and use platform data if that is the case.
+ */
+ if (err == -ENXIO || err == -ENODATA)
+ 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
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