Retries sending the TPM command a couple times upon receiving EBUSY. See
http://crbug.com/759541 for more details.

--- a/Common/TpmDeviceAccess/Linux/DeviceAccessTpmDriver.c
+++ b/Common/TpmDeviceAccess/Linux/DeviceAccessTpmDriver.c
@@ -16,6 +16,7 @@
 #include "StdInclude.h"
 #include "DeviceAccessTpmDriver.h"
 #include "Logging.h"
+#include "Platform.h"
 #include "PropertyStorage.h"
 
 #define DEV_TPM "/dev/tpm0"
@@ -151,6 +152,7 @@
 	{
 		UINT32 unFileHandle = 0;
 		int nBytes = 0;
+		int nWriteRetryCounter = 0;
 
 		// Check parameters
 		if (NULL == PrgbRequestBuffer || NULL == PrgbResponseBuffer || NULL == PpunResponseBufferSize)
@@ -167,7 +169,16 @@
 			break;
 		}
 
-		nBytes = write(unFileHandle, PrgbRequestBuffer, PunRequestBufferSize);
+		while (1) {
+			nBytes = write(unFileHandle, PrgbRequestBuffer, PunRequestBufferSize);
+			if (nBytes == -1 && errno == EBUSY && ++nWriteRetryCounter < 5) {
+				LOGGING_WRITE_LEVEL1(L"Error: DeviceAccess_Transmit: Write failed with EBUSY, retrying.");
+				Platform_Sleep(1000);
+			} else {
+				break;
+			}
+		}
+
 		if (nBytes == -1 || nBytes != (int)PunRequestBufferSize)
 		{
 			LOGGING_WRITE_LEVEL1_FMT(L"Error: DeviceAccess_Transmit: Write failed with errno %d (%s).", errno, strerror(errno));