File 0282-tpm-lookup-cancel-path-under-tpm-de.patch of Package qemu.12243

From 30faae79ce7975a50d149ef4f06d35389164d731 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Marc-Andr=C3=A9=20Lureau?= <marcandre.lureau@redhat.com>
Date: Mon, 29 Jan 2018 19:33:04 +0100
Subject: [PATCH] tpm: lookup cancel path under tpm device class
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Since Linux commit 313d21eeab9282e, tpm devices have their own device
class "tpm" and the cancel path must be looked up under
/sys/class/tpm/ instead of /sys/class/misc/.

Signed-off-by: Marc-André Lureau <marcandre.lureau@redhat.com>
Reviewed-by: Stefan Berger <stefanb@linux.vnet.ibm.com>
Signed-off-by: Stefan Berger <stefanb@linux.vnet.ibm.com>
(cherry picked from commit 05b71fb207ab7f016e067bd2a40fc0804362eb74)
[LY: BSC#1079405]
Signed-off-by: Liang Yan <lyan@suse.com>
---
 hw/tpm/tpm_passthrough.c | 12 +++++++++---
 1 file changed, 9 insertions(+), 3 deletions(-)

diff --git a/hw/tpm/tpm_passthrough.c b/hw/tpm/tpm_passthrough.c
index e88c0d20bc..dd048e49ce 100644
--- a/hw/tpm/tpm_passthrough.c
+++ b/hw/tpm/tpm_passthrough.c
@@ -369,7 +369,8 @@ static TPMVersion tpm_passthrough_get_tpm_version(TPMBackend *tb)
  * Unless path or file descriptor set has been provided by user,
  * determine the sysfs cancel file following kernel documentation
  * in Documentation/ABI/stable/sysfs-class-tpm.
- * From /dev/tpm0 create /sys/class/misc/tpm0/device/cancel
+ * From /dev/tpm0 create /sys/class/tpm/tpm0/device/cancel
+ * before 4.0: /sys/class/misc/tpm0/device/cancel
  */
 static int tpm_passthrough_open_sysfs_cancel(TPMBackend *tb)
 {
@@ -390,10 +391,15 @@ static int tpm_passthrough_open_sysfs_cancel(TPMBackend *tb)
     dev = strrchr(tpm_pt->tpm_dev, '/');
     if (dev) {
         dev++;
-        if (snprintf(path, sizeof(path), "/sys/class/misc/%s/device/cancel",
+        if (snprintf(path, sizeof(path), "/sys/class/tpm/%s/device/cancel",
                      dev) < sizeof(path)) {
             fd = qemu_open(path, O_WRONLY);
-            if (fd >= 0) {
+            if (fd < 0) {
+            	if (snprintf(path, sizeof(path), "/sys/class/misc/%s/device/cancel", dev) < sizeof(path)) {
+                fd = qemu_open(path, O_WRONLY);
+            	}
+            }
+	    if (fd >= 0) {
                 tb->cancel_path = g_strdup(path);
             } else {
                 error_report("tpm_passthrough: Could not open TPM cancel "