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- When acquiring a mapping check if the mapping hasn't already been used

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- Set tag value to zero when releasing a mapping

svn path=/trunk/; revision=40832
This commit is contained in:
Johannes Anderwald 2009-05-07 23:33:27 +00:00
parent 94d54b18f9
commit 8e4c1cabb7
1 changed files with 5 additions and 4 deletions
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9
reactos/drivers/wdm/audio/backpln/portcls/irpstream.c
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@ -142,7 +142,6 @@ IIrpQueue_fnAddMapping(
IN PIRP Irp)
{
PIRP_MAPPING Mapping;
ULONG Index;
IIrpQueueImpl * This = (IIrpQueueImpl*)iface;
Mapping = AllocateItem(NonPagedPool, sizeof(IRP_MAPPING), TAG_PORTCLASS);
@ -183,8 +182,7 @@ IIrpQueue_fnAddMapping(
return STATUS_UNSUCCESSFUL;
}
ASSERT(Mapping->NumTags < 32);
for(Index = 0; Index < Mapping->NumTags; Index++);
Mapping->References |= (1 << Index);
Mapping->References = (1 << Mapping->NumTags) - 1;
This->NumDataAvailable += Mapping->Header->DataUsed;
@ -392,6 +390,7 @@ IIrpQueue_fnGetMappingWithTag(
PIRP_MAPPING CurMapping;
PLIST_ENTRY CurEntry;
ULONG Index;
ULONG Value;
IIrpQueueImpl * This = (IIrpQueueImpl*)iface;
*Flags = 0;
@ -413,7 +412,8 @@ IIrpQueue_fnGetMappingWithTag(
CurMapping = CONTAINING_RECORD(CurEntry, IRP_MAPPING, Entry);
for(Index = 0; Index < CurMapping->NumTags; Index++)
{
if (CurMapping->Tag[Index] == NULL)
Value = CurMapping->References & ( 1 << Index);
if (CurMapping->Tag[Index] == NULL && Value)
{
/* found a free mapping within audio irp */
GetMapping(This, Index, Tag, CurMapping, PhysicalAddress, VirtualAddress, ByteCount, Flags);
@ -460,6 +460,7 @@ IIrpQueue_fnReleaseMappingWithTag(
if (CurMapping->Tag[Index] == Tag)
{
Found = TRUE;
CurMapping->Tag[Index] = NULL;
break;
}
}