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Fix bug in DataHub where it would skip the first record in a set when a filter is being used. Also add comments and update source code logic to make it easier to understand and maintain. 

git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@11008 6f19259b-4bc3-4df7-8a09-765794883524
This commit is contained in:
mdkinney 2010-11-05 20:22:18 +00:00
parent 3e516e5e0f
commit d2720e0ce8
1 changed files with 69 additions and 58 deletions
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127
IntelFrameworkModulePkg/Universal/DataHubDxe/DataHub.c
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@ -286,85 +286,96 @@ DataHubGetNextRecord (
DATA_HUB_INSTANCE *Private;
DATA_HUB_FILTER_DRIVER *FilterDriver;
UINT64 ClassFilter;
UINT64 FilterMonotonicCount;
Private = DATA_HUB_INSTANCE_FROM_THIS (This);
FilterDriver = NULL;
FilterMonotonicCount = 0;
ClassFilter = EFI_DATA_RECORD_CLASS_DEBUG |
EFI_DATA_RECORD_CLASS_ERROR |
EFI_DATA_RECORD_CLASS_DATA |
EFI_DATA_RECORD_CLASS_PROGRESS_CODE;
if (FilterDriverEvent != NULL) {
//
// For events the beginning is the last unread record. This info is
// stored in the instance structure, so we must look up the event
// to get the data.
//
FilterDriver = FindFilterDriverByEvent (
&Private->FilterDriverListHead,
*FilterDriverEvent
);
if (FilterDriver == NULL) {
return EFI_INVALID_PARAMETER;
}
//
// Use the Class filter the event was created with.
//
ClassFilter = FilterDriver->ClassFilter;
if (*MonotonicCount == 0) {
//
// Use the MTC from the Filter Driver.
//
FilterMonotonicCount = FilterDriver->GetNextMonotonicCount;
//
// The GetNextMonotonicCount field remembers the last value from the previous time.
// But we already processed this vaule, so we need to find the next one.
//
*Record = GetNextDataRecord (&Private->DataListHead, ClassFilter, &FilterMonotonicCount);
if (FilterMonotonicCount != 0) {
*MonotonicCount = FilterMonotonicCount;
}
if ((FilterDriver->GetNextMonotonicCount != 0) && (FilterMonotonicCount == 0)) {
//
// If there is no new record to get exit now.
//
*MonotonicCount = 0;
return EFI_NOT_FOUND;
}
//
// If FilterDriverEvent is NULL, then return the next record
//
if (FilterDriverEvent == NULL) {
*Record = GetNextDataRecord (&Private->DataListHead, ClassFilter, MonotonicCount);
if (*Record == NULL) {
return EFI_NOT_FOUND;
}
return EFI_SUCCESS;
}
//
// For events the beginning is the last unread record. This info is
// stored in the instance structure, so we must look up the event
// to get the data.
//
FilterDriver = FindFilterDriverByEvent (
&Private->FilterDriverListHead,
*FilterDriverEvent
);
if (FilterDriver == NULL) {
return EFI_INVALID_PARAMETER;
}
//
// Return the record
// Use the Class filter the event was created with.
//
ClassFilter = FilterDriver->ClassFilter;
//
// Retrieve the next record or the first record.
//
if (*MonotonicCount != 0 || FilterDriver->GetNextMonotonicCount == 0) {
*Record = GetNextDataRecord (&Private->DataListHead, ClassFilter, MonotonicCount);
if (*Record == NULL) {
return EFI_NOT_FOUND;
}
if (*MonotonicCount != 0) {
//
// If this was not the last record then update the count associated with the filter
//
FilterDriver->GetNextMonotonicCount = *MonotonicCount;
} else {
//
// Save the MonotonicCount of the last record which has been read
//
FilterDriver->GetNextMonotonicCount = (*Record)->LogMonotonicCount;
}
return EFI_SUCCESS;
}
//
// This is a request to read the first record that has not been read yet.
// Set MonotoicCount to the last record successfuly read
//
*MonotonicCount = FilterDriver->GetNextMonotonicCount;
//
// Retrieve the last record successfuly read again, but do not return it since
// it has already been returned before.
//
*Record = GetNextDataRecord (&Private->DataListHead, ClassFilter, MonotonicCount);
if (*Record == NULL) {
return EFI_NOT_FOUND;
}
if (*MonotonicCount != 0) {
//
// Update the count associated with the filter
//
FilterDriver->GetNextMonotonicCount = *MonotonicCount;
if (FilterDriver != NULL) {
//
// If we have a filter driver update the records that have been read.
// If MonotonicCount is zero No more reacords left.
//
if (*MonotonicCount == 0) {
//
// Save the current Record MonotonicCount.
//
FilterDriver->GetNextMonotonicCount = (*Record)->LogMonotonicCount;
} else {
//
// Point to next undread record
//
FilterDriver->GetNextMonotonicCount = *MonotonicCount;
// Retrieve the record after the last record successfuly read
//
*Record = GetNextDataRecord (&Private->DataListHead, ClassFilter, MonotonicCount);
if (*Record == NULL) {
return EFI_NOT_FOUND;
}
}
return EFI_SUCCESS;
}