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authorDavid Bauer <mail@david-bauer.net>2019-09-22 19:15:56 +0200
committerDavid Bauer <mail@david-bauer.net>2019-09-25 22:42:03 +0200
commite2c084cabc2b2a2fffc36aee3e48874f9862c74a (patch)
tree33018297cad25c61b313f88d9898b0b501da5e51 /target/linux/ipq40xx/patches-4.19
parentc8933ce53365671de98a303c8d94e089ea76754e (diff)
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ipq40xx: abort ar40xx probe on missing PHYs
The ar40xx driver currently panics in case no QCA807x PHY has been successfully probed. This happens when the external PHY is still in reset when probing the ar40xx switch driver. Note that this patch does not fix the root cause, ar40xx_probe now simply fails instead of causing a kernel panic due to a nullpointer dereference. Signed-off-by: David Bauer <mail@david-bauer.net>
Diffstat (limited to 'target/linux/ipq40xx/patches-4.19')
-rw-r--r--target/linux/ipq40xx/patches-4.19/706-ar40xx-abort-probe-on-missig-phy.patch23
1 files changed, 23 insertions, 0 deletions
diff --git a/target/linux/ipq40xx/patches-4.19/706-ar40xx-abort-probe-on-missig-phy.patch b/target/linux/ipq40xx/patches-4.19/706-ar40xx-abort-probe-on-missig-phy.patch
new file mode 100644
index 0000000000..19474bff0d
--- /dev/null
+++ b/target/linux/ipq40xx/patches-4.19/706-ar40xx-abort-probe-on-missig-phy.patch
@@ -0,0 +1,23 @@
+--- a/drivers/net/phy/ar40xx.c
++++ b/drivers/net/phy/ar40xx.c
+@@ -2021,6 +2021,12 @@ static int ar40xx_probe(struct platform_
+ /* register switch */
+ swdev = &priv->dev;
+
++ if (priv->mii_bus == NULL) {
++ dev_err(&pdev->dev, "Probe failed - Missing PHYs!\n");
++ ret = -ENODEV;
++ goto err_missing_phy;
++ }
++
+ swdev->alias = dev_name(&priv->mii_bus->dev);
+
+ swdev->cpu_port = AR40XX_PORT_CPU;
+@@ -2052,6 +2058,7 @@ err_unregister_switch:
+ unregister_switch(&priv->dev);
+ err_unregister_phy:
+ phy_driver_unregister(&ar40xx_phy_driver);
++err_missing_phy:
+ platform_set_drvdata(pdev, NULL);
+ return ret;
+ }