mirror of
https://github.com/acidanthera/audk.git
synced 2025-04-08 17:05:09 +02:00
a717086c5f
When reading data from non-blockingly from a CD-ROM logic partition, the procedure can be shown by the following call stack: (The write process is similar) |-------------------| | DiskIoDxe (logic) |<---Raise Tpl to TPL_CALLBACK |-------------------| | | Sub-task 1 (UnderRun) succeeds | | |-----------------| |-----------------| |-----------------| +--->| PartitionDxe |---->| DiskIoDxe (Phy) |---->| ScsiDiskDxe | | |-----------------| |-----------------| |-----------------| | | Sub-task 2 (OverRun) fails | | |-----------------| |-----------------| |-----------------| +--->| PartitionDxe |---->| DiskIoDxe (Phy) |---->| ScsiDiskDxe | | |-----------------| |-----------------| |-----------------| | ^ | | More subtasks... Wait indefinitely | |<---Restore Tpl | Completes In PartitionDxe, if the 'Lba' and 'BufferSize' parameters passed to function PartitionReadBlocksEx() are invalid, the function will issue a blocking ReadDisk call (in function ProbeMediaStatusEx()). In DiskIoDxe, blocking I/O request will wait for all the non-blocking I/O requests to complete first before sending down the blocking request. If the Tpl of the async I/O callback in ScsiDiskDxe is TPL_CALLBACK and Sub-task 1 (UnderRun) succeeds but Sub-task 2 (OverRun) fails with an invalid parameter, DiskIoDxe will wait indefinitely for the event created by ScsiDiskDxe of Sub-task 1 to signal. Hence, this commit will raise the Tpl of async IO callback in ScsiDiskDxe to TPL_NOTIFY so that the indefinite wait in DiskIoDxe can be avoided. Contributed-under: TianoCore Contribution Agreement 1.0 Signed-off-by: Hao Wu <hao.a.wu@intel.com> Reviewed-by: Feng Tian <feng.tian@intel.com> git-svn-id: https://svn.code.sf.net/p/edk2/code/trunk/edk2@19452 6f19259b-4bc3-4df7-8a09-765794883524