https://git.reactos.org/?p=reactos.git;a=commitdiff;h=6c93669012c654efc4635…
commit 6c93669012c654efc46354670251a5475ac0f41f
Author: Thomas Faber <thomas.faber(a)reactos.org>
AuthorDate: Fri Jan 31 23:03:57 2020 +0100
Commit: Thomas Faber <thomas.faber(a)reactos.org>
CommitDate: Sun Feb 9 08:32:56 2020 +0100
[HAL] Use a spin lock for the DMA adapter list. CORE-16611
This is necessary because HalPutDmaAdapter can be called at DISPATCH_LEVEL.
---
hal/halx86/generic/dma.c | 25 +++++++++++++++++--------
1 file changed, 17 insertions(+), 8 deletions(-)
diff --git a/hal/halx86/generic/dma.c b/hal/halx86/generic/dma.c
index 7bcfc33e037..39c2efe42a6 100644
--- a/hal/halx86/generic/dma.c
+++ b/hal/halx86/generic/dma.c
@@ -85,6 +85,7 @@
#ifndef _MINIHAL_
static KEVENT HalpDmaLock;
+static KSPIN_LOCK HalpDmaAdapterListLock;
static LIST_ENTRY HalpDmaAdapterList;
static PADAPTER_OBJECT HalpEisaAdapter[8];
#endif
@@ -165,6 +166,7 @@ HalpInitDma(VOID)
* first map buffers.
*/
InitializeListHead(&HalpDmaAdapterList);
+ KeInitializeSpinLock(&HalpDmaAdapterListLock);
KeInitializeEvent(&HalpDmaLock, NotificationEvent, TRUE);
HalpMasterAdapter = HalpDmaAllocateMasterAdapter();
@@ -621,6 +623,7 @@ HalGetAdapter(IN PDEVICE_DESCRIPTION DeviceDescription,
BOOLEAN EisaAdapter;
ULONG MapRegisters;
ULONG MaximumLength;
+ KIRQL OldIrql;
/* Validate parameters in device description */
if (DeviceDescription->Version > DEVICE_DESCRIPTION_VERSION2) return NULL;
@@ -688,8 +691,7 @@ HalGetAdapter(IN PDEVICE_DESCRIPTION DeviceDescription,
}
/*
- * Acquire the DMA lock that is used to protect adapter lists and
- * EISA adapter array.
+ * Acquire the DMA lock that is used to protect the EISA adapter array.
*/
KeWaitForSingleObject(&HalpDmaLock, Executive, KernelMode, FALSE, NULL);
@@ -745,14 +747,20 @@ HalGetAdapter(IN PDEVICE_DESCRIPTION DeviceDescription,
}
}
- if (!EisaAdapter) InsertTailList(&HalpDmaAdapterList, &AdapterObject->AdapterList);
-
/*
- * Release the DMA lock. HalpDmaAdapterList and HalpEisaAdapter will
- * no longer be touched, so we don't need it.
+ * Release the DMA lock. HalpEisaAdapter will no longer be touched,
+ * so we don't need it.
*/
KeSetEvent(&HalpDmaLock, 0, 0);
+ if (!EisaAdapter)
+ {
+ /* If it's not one of the static adapters, add it to the list */
+ KeAcquireSpinLock(&HalpDmaAdapterListLock, &OldIrql);
+ InsertTailList(&HalpDmaAdapterList, &AdapterObject->AdapterList);
+ KeReleaseSpinLock(&HalpDmaAdapterListLock, OldIrql);
+ }
+
/*
* Setup the values in the adapter object that are common for all
* types of buses.
@@ -818,11 +826,12 @@ VOID
NTAPI
HalPutDmaAdapter(IN PADAPTER_OBJECT AdapterObject)
{
+ KIRQL OldIrql;
if (AdapterObject->ChannelNumber == 0xFF)
{
- KeWaitForSingleObject(&HalpDmaLock, Executive, KernelMode, FALSE, NULL);
+ KeAcquireSpinLock(&HalpDmaAdapterListLock, &OldIrql);
RemoveEntryList(&AdapterObject->AdapterList);
- KeSetEvent(&HalpDmaLock, 0, 0);
+ KeReleaseSpinLock(&HalpDmaAdapterListLock, OldIrql);
}
ObDereferenceObject(AdapterObject);