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[SERIAL] Immediately complete read IRP if all requested bytes have been found in circular buffer

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Previously, we had to wait to receive another byte to finish the first IRP.
This commit is contained in:
Hervé Poussineau 2019-05-02 13:26:46 +02:00
parent ebd39aa266
commit bef39dd62e
1 changed files with 7 additions and 1 deletions
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8
drivers/serial/serial/rw.c
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@ -65,7 +65,7 @@ ReadBytes(
} }
/* while buffer is not fully filled */ /* while buffer is not fully filled */
while (Length > 0) while (TRUE)
{ {
/* read already received bytes from buffer */ /* read already received bytes from buffer */
KeAcquireSpinLock(&DeviceExtension->InputBufferLock, &Irql); KeAcquireSpinLock(&DeviceExtension->InputBufferLock, &Irql);
@ -81,6 +81,12 @@ ReadBytes(
KeClearEvent(&DeviceExtension->InputBufferNotEmpty); KeClearEvent(&DeviceExtension->InputBufferNotEmpty);
KeReleaseSpinLock(&DeviceExtension->InputBufferLock, Irql); KeReleaseSpinLock(&DeviceExtension->InputBufferLock, Irql);
if (Length == 0)
{
INFO_(SERIAL, "All bytes read\n");
break;
}
if (WorkItemData->DontWait if (WorkItemData->DontWait
&& !(WorkItemData->ReadAtLeastOneByte && Information == 0)) && !(WorkItemData->ReadAtLeastOneByte && Information == 0))
{ {