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ERROR_GPIO_INVALID_REGISTRATION_PACKET
Invalid GPIO client registration packet
ERROR_GPIO_INVALID_REGISTRATION_PACKET is Windows system result 15324 (0x00003BDC). GpioClx rejected the packet used to register the controller driver and its callback table.
This result covers packet-level defects such as invalid Version or Size pairing, missing required callbacks, bad flags, reserved fields, or an impossible controller context size.
Where this value belongs
- The driver calls GPIO_CLX_RegisterClient from DriverEntry.
- A stack or heap packet is only partially initialized.
- Callback declarations do not satisfy the selected GpioClx contract.
Registration happens before normal controller I/O. A packet rejected here should be fixed in driver construction rather than treated as a pin or firmware runtime failure.
Common interpretation mistakes
- It is mishandled when the packet is not zero-initialized.
- It is mishandled when a callback pointer references unloaded or incompatible code.
- It is mishandled when reserved bits contain stack garbage.
- It is mishandled when ControllerContextSize overflows or violates alignment expectations.
Diagnostic sequence
- Dump Version, Size, Flags, Reserved, and ControllerContextSize.
- List every required and optional callback pointer.
- Verify the packet remains valid for the duration of registration.
- Check compiler packing and header consistency.
- Call GPIO_CLX_RegisterClient only from the documented initialization phase.
- Use the returned status before any cleanup call overwrites it.
Evidence worth keeping
- preserve raw registration packet bytes.
- preserve decoded callback names and addresses.
- preserve compiler packing and structure size.
- preserve DriverEntry call stack.
- preserve GpioClx registration return status.
A raw packet dump for it can reveal uninitialized reserved bytes that a formatted callback list misses.
Correct handling and recovery
Construct the packet from the installed WDK definition, initialize every field deliberately, and supply callbacks required by the selected capabilities.
Registration can be retried after the packet is rebuilt or the driver is updated. Repeating the same packet during device restart is not remediation.
Difference from nearby values
ERROR_GPIO_CLIENT_INFORMATION_INVALID may occur with semantically invalid client data. Code 15324 rejects the registration packet that establishes the GpioClx relationship.
Practical scenario
A local packet is not fully zeroed, leaving a nonzero Reserved field. Driver tracing captures the bytes, full initialization removes the garbage, and registration succeeds.
Implementation guidance
Prefer aggregate zero initialization plus explicit field assignment. Static analysis should verify callback signatures and packet lifetime.
For code 15324, record gpio_packet_version, gpio_packet_size, gpio_packet_flags, gpio_packet_reserved, and gpio_packet_callbacks_hash.
References
- Microsoft: System Error Codes 12000–15999
- Microsoft: GpioClx DDI
- Microsoft: GPIO_CLX_RegisterClient
- Microsoft: GPIO_CLIENT_REGISTRATION_PACKET
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