From 0bb9eeb500c937cd9b8379691317636896ccd375 Mon Sep 17 00:00:00 2001
From: hastigondaliya <118960681+hastigondaliya@users.noreply.github.com>
Date: Tue, 21 Nov 2023 01:03:51 +0530
Subject: [PATCH] [posix] clear SPI tx buffer after usage (#9567)

This commit clear "mSpiTxPayloadSize" buffer once packet has been
successfully transmitted.
---
 src/posix/platform/spi_interface.cpp | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/src/posix/platform/spi_interface.cpp b/src/posix/platform/spi_interface.cpp
index 54e889a7b..167f4b9c3 100644
--- a/src/posix/platform/spi_interface.cpp
+++ b/src/posix/platform/spi_interface.cpp
@@ -569,6 +569,8 @@ otError SpiInterface::PushPullSpi(void)
             mInterfaceMetrics.mTxFrameCount++;
             mInterfaceMetrics.mTxFrameByteCount += mSpiTxPayloadSize;
 
+            // Clear tx buffer after usage
+            memset(&mSpiTxFrameBuffer[kSpiFrameHeaderSize], 0, mSpiTxPayloadSize);
             mSpiTxIsReady      = false;
             mSpiTxPayloadSize  = 0;
             mSpiTxRefusedCount = 0;