MdeModulePkg ScsiDiskDxe: Raise the Tpl of async IO callback to TPL_NOTIFY
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-
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