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EFI_USBFN_IO_PROTOCOL.AllocateTransferBuffer

  • Article

The AllocateTransferBuffer function allocates a transfer buffer of the specified size that satisfies controller requirements.

The allocated transfer buffer must be freed using a matching call to the FreeTransferBuffer function.

Syntax

typedef
EFI_STATUS
(EFIAPI * EFI_USBFN_IO_ALLOCATE_TRANSFER_BUFFER) (
  IN EFI_USBFN_IO_PROTOCOL    *This,
  IN UINTN                    Size,
  OUT VOID                    **Buffer
  );

Parameters

This
A pointer to the EFI_USBFN_IO_PROTOCOL instance.

Size
The number of bytes to allocate for the transfer buffer.

Buffer
A pointer to a pointer to the allocated buffer if the call succeeds; undefined otherwise.

Return values

This function returns the following values:

Return value Description
EFI_SUCCESS The function returned successfully.
EFI_INVALID_PARAMETER A parameter is invalid.
EFI_OUT_OF_RESOURCES The requested transfer buffer could not be allocated.

Requirements

Header: User generated