From: Hervé Poussineau <hpoussin@reactos.org>
Date: Thu, 2 May 2019 11:26:46 +0000 (+0200)
Subject: [SERIAL] Immediately complete read IRP if all requested bytes have been found in... 
X-Git-Tag: 0.4.14-dev~1065
X-Git-Url: https://git.reactos.org/?p=reactos.git;a=commitdiff_plain;h=bef39dd62ee62a2b7c0eb1a3749dee0c700b5188

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

Previously, we had to wait to receive another byte to finish the first IRP.
---

diff --git a/drivers/serial/serial/rw.c b/drivers/serial/serial/rw.c
index df101ca07b8..4179ac820b9 100644
--- a/drivers/serial/serial/rw.c
+++ b/drivers/serial/serial/rw.c
@@ -65,7 +65,7 @@ ReadBytes(
 	}
 
 	/* while buffer is not fully filled */
-	while (Length > 0)
+	while (TRUE)
 	{
 		/* read already received bytes from buffer */
 		KeAcquireSpinLock(&DeviceExtension->InputBufferLock, &Irql);
@@ -81,6 +81,12 @@ ReadBytes(
 		KeClearEvent(&DeviceExtension->InputBufferNotEmpty);
 		KeReleaseSpinLock(&DeviceExtension->InputBufferLock, Irql);
 
+		if (Length == 0)
+		{
+			INFO_(SERIAL, "All bytes read\n");
+			break;
+		}
+
 		if (WorkItemData->DontWait
 			&& !(WorkItemData->ReadAtLeastOneByte && Information == 0))
 		{