If the generic PHY support is disabled the stub of devm_of_phy_get_by_index
returns ENOSYS. This corner case isn't handled properly by
usb_phy_roothub_add_phy and at least breaks USB support on Raspberry Pi
(bcm2835_defconfig):
dwc2 20980000.usb: dwc2_hcd_init() FAILED, returning -38
dwc2: probe of 20980000.usb failed with error -38
Let usb_phy_roothub_alloc() return in case CONFIG_GENERIC_PHY is
disabled to fix this issue (compilers might even be smart enough to
optimize away most of the code within usb_phy_roothub_alloc and
usb_phy_roothub_add_phy if CONFIG_GENERIC_PHY is disabled). All
existing usb_phy_roothub_* functions are already NULL-safe, so no
special handling is required there.
Fixes: 07dbff0ddbd8 ("usb: core: add a wrapper for the USB PHYs on the HCD")
Reported-by: Stefan Wahren <stefan.wahren@xxxxxxxx>
Signed-off-by: Martin Blumenstingl <martin.blumenstingl@xxxxxxxxxxxxxx>
---
drivers/usb/core/phy.c | 3 +++
1 file changed, 3 insertions(+)
diff --git a/drivers/usb/core/phy.c b/drivers/usb/core/phy.c
index a39d9bb26a4f..9879767452a2 100644
--- a/drivers/usb/core/phy.c
+++ b/drivers/usb/core/phy.c
@@ -50,6 +50,9 @@ struct usb_phy_roothub *usb_phy_roothub_alloc(struct device *dev)
struct usb_phy_roothub *phy_roothub;
int i, num_phys, err;
+ if (!IS_ENABLED(CONFIG_GENERIC_PHY))
+ return NULL;
+
num_phys = of_count_phandle_with_args(dev->of_node, "phys",
"#phy-cells");
if (num_phys <= 0)
--
2.17.0
--
To unsubscribe from this list: send the line "unsubscribe linux-usb" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
