linux-kernel - [PATCH 1/2] selftests: tpm2: Open tpm dev in unbuffered mode

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Message-ID: <154939851385.18477.481518864800562919.stgit@tstruk-mobl1.jf.intel.com>
Date:   Tue, 05 Feb 2019 12:28:33 -0800
From:   Tadeusz Struk <tadeusz.struk@...el.com>
To:     jarkko.sakkinen@...ux.intel.com
Cc:     linux-kselftest@...r.kernel.org, shuah@...nel.org,
        linux-kernel@...r.kernel.org, linux-integrity@...r.kernel.org,
        linux-security-module@...r.kernel.org, PeterHuewe@....de,
        jgg@...pe.ca
Subject: [PATCH 1/2] selftests: tpm2: Open tpm dev in unbuffered mode

In order to have control over how many bytes are read or written
the device needs to be opened in unbuffered mode.

Signed-off-by: Tadeusz Struk <tadeusz.struk@...el.com>
---
 tools/testing/selftests/tpm2/tpm2.py |    4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/tools/testing/selftests/tpm2/tpm2.py b/tools/testing/selftests/tpm2/tpm2.py
index 40ea95ce2ead..c2b9f2b1a0ac 100644
--- a/tools/testing/selftests/tpm2/tpm2.py
+++ b/tools/testing/selftests/tpm2/tpm2.py
@@ -357,9 +357,9 @@ class Client:
         self.flags = flags
 
         if (self.flags & Client.FLAG_SPACE) == 0:
-            self.tpm = open('/dev/tpm0', 'r+b')
+            self.tpm = open('/dev/tpm0', 'r+b', buffering=0)
         else:
-            self.tpm = open('/dev/tpmrm0', 'r+b')
+            self.tpm = open('/dev/tpmrm0', 'r+b', buffering=0)
 
     def close(self):
         self.tpm.close()