The typec plug alternate mode is already registered as part of the bus.
When both class and bus are set for a device, device_add() attempts to
create the "subsystem" symlink in the device's sysfs directory twice, once
for the bus and once for the class.
This results in a duplicate filename error during registration,
causing the alternate mode registration to fail with warnings:

cannot create duplicate filename '/devices/pci0000:00/0000:00:1f.0/
  PNP0C09:00/GOOG0004:00/cros-ec-dev.1.auto/cros_ec_ucsi.3.auto/typec/
  port1/port1-cable/port1-plug0/port1-plug0.0/subsystem'
typec port0-plug0: failed to register alternate mode (-17)
cros_ec_ucsi.3.auto: failed to registers svid 0x8087 mode 1

Cc: stable@vger.kernel.org
Fixes: 67ab45426215 ("usb: typec: Set the bus also for the port and plug altmodes")
Tested-by: Madhu M <madhu.m@intel.corp-partner.google.com>
Signed-off-by: Andrei Kuchynski <akuchynski@chromium.org>
---
Changes in V2:
- Marked as a Fix

 drivers/usb/typec/class.c | 4 ----
 1 file changed, 4 deletions(-)

diff --git a/drivers/usb/typec/class.c b/drivers/usb/typec/class.c
index 8314309094719..0977581ad1b6e 100644
--- a/drivers/usb/typec/class.c
+++ b/drivers/usb/typec/class.c
@@ -686,10 +686,6 @@ typec_register_altmode(struct device *parent,
 
 	alt->adev.dev.bus = &typec_bus;
 
-	/* Plug alt modes need a class to generate udev events. */
-	if (is_typec_plug(parent))
-		alt->adev.dev.class = &typec_class;
-
 	ret = device_register(&alt->adev.dev);
 	if (ret) {
 		dev_err(parent, "failed to register alternate mode (%d)\n",
-- 
2.53.0.983.g0bb29b3bc5-goog

On Tue, Mar 24, 2026 at 10:29:03AM +0000, Andrei Kuchynski wrote:
> The typec plug alternate mode is already registered as part of the bus.
> When both class and bus are set for a device, device_add() attempts to
> create the "subsystem" symlink in the device's sysfs directory twice, once
> for the bus and once for the class.
> This results in a duplicate filename error during registration,
> causing the alternate mode registration to fail with warnings:
> 
> cannot create duplicate filename '/devices/pci0000:00/0000:00:1f.0/
>   PNP0C09:00/GOOG0004:00/cros-ec-dev.1.auto/cros_ec_ucsi.3.auto/typec/
>   port1/port1-cable/port1-plug0/port1-plug0.0/subsystem'
> typec port0-plug0: failed to register alternate mode (-17)
> cros_ec_ucsi.3.auto: failed to registers svid 0x8087 mode 1
> 
> Cc: stable@vger.kernel.org
> Fixes: 67ab45426215 ("usb: typec: Set the bus also for the port and plug altmodes")
> Tested-by: Madhu M <madhu.m@intel.corp-partner.google.com>
> Signed-off-by: Andrei Kuchynski <akuchynski@chromium.org>

Reviewed-by: Benson Leung <bleung@chromium.org>


> ---
> Changes in V2:
> - Marked as a Fix
> 
>  drivers/usb/typec/class.c | 4 ----
>  1 file changed, 4 deletions(-)
> 
> diff --git a/drivers/usb/typec/class.c b/drivers/usb/typec/class.c
> index 8314309094719..0977581ad1b6e 100644
> --- a/drivers/usb/typec/class.c
> +++ b/drivers/usb/typec/class.c
> @@ -686,10 +686,6 @@ typec_register_altmode(struct device *parent,
>  
>  	alt->adev.dev.bus = &typec_bus;
>  
> -	/* Plug alt modes need a class to generate udev events. */
> -	if (is_typec_plug(parent))
> -		alt->adev.dev.class = &typec_class;
> -
>  	ret = device_register(&alt->adev.dev);
>  	if (ret) {
>  		dev_err(parent, "failed to register alternate mode (%d)\n",
> -- 
> 2.53.0.983.g0bb29b3bc5-goog
> 
> 

On Tue, Mar 24, 2026 at 10:29:03AM +0000, Andrei Kuchynski wrote:
> The typec plug alternate mode is already registered as part of the bus.
> When both class and bus are set for a device, device_add() attempts to
> create the "subsystem" symlink in the device's sysfs directory twice, once
> for the bus and once for the class.
> This results in a duplicate filename error during registration,
> causing the alternate mode registration to fail with warnings:
> 
> cannot create duplicate filename '/devices/pci0000:00/0000:00:1f.0/
>   PNP0C09:00/GOOG0004:00/cros-ec-dev.1.auto/cros_ec_ucsi.3.auto/typec/
>   port1/port1-cable/port1-plug0/port1-plug0.0/subsystem'
> typec port0-plug0: failed to register alternate mode (-17)
> cros_ec_ucsi.3.auto: failed to registers svid 0x8087 mode 1
> 
> Cc: stable@vger.kernel.org
> Fixes: 67ab45426215 ("usb: typec: Set the bus also for the port and plug altmodes")
> Tested-by: Madhu M <madhu.m@intel.corp-partner.google.com>
> Signed-off-by: Andrei Kuchynski <akuchynski@chromium.org>

Reviewed-by: Heikki Krogerus <heikki.krogerus@linux.intel.com>

> ---
> Changes in V2:
> - Marked as a Fix
> 
>  drivers/usb/typec/class.c | 4 ----
>  1 file changed, 4 deletions(-)
> 
> diff --git a/drivers/usb/typec/class.c b/drivers/usb/typec/class.c
> index 8314309094719..0977581ad1b6e 100644
> --- a/drivers/usb/typec/class.c
> +++ b/drivers/usb/typec/class.c
> @@ -686,10 +686,6 @@ typec_register_altmode(struct device *parent,
>  
>  	alt->adev.dev.bus = &typec_bus;
>  
> -	/* Plug alt modes need a class to generate udev events. */
> -	if (is_typec_plug(parent))
> -		alt->adev.dev.class = &typec_class;
> -
>  	ret = device_register(&alt->adev.dev);
>  	if (ret) {
>  		dev_err(parent, "failed to register alternate mode (%d)\n",

thanks,

-- 
heikki