[Qemu-devel] [PATCH v3 6/8] tpm-backend: Move realloc_buffer() implementation to base class

[Amarnath Valluri <amarnath.valluri@intel.com>]

Provide base implementation of realloc_buffer(), so that backend implementations
can resue.

Signed-off-by: Amarnath Valluri <amarnath.valluri@intel.com>
---
 backends/tpm.c           |  9 ++++++++-
 hw/tpm/tpm_passthrough.c | 12 ------------
 2 files changed, 8 insertions(+), 13 deletions(-)

diff --git a/backends/tpm.c b/backends/tpm.c
index 4a6358e..f048c1d 100644
--- a/backends/tpm.c
+++ b/backends/tpm.c
@@ -88,8 +88,15 @@ bool tpm_backend_had_startup_error(TPMBackend *s)
 size_t tpm_backend_realloc_buffer(TPMBackend *s, TPMSizedBuffer *sb)
 {
     TPMBackendClass *k = TPM_BACKEND_GET_CLASS(s);
+    if (!k->ops->realloc_buffer) {
+        size_t wanted_size = 4096; /* Linux tpm.c buffer size */
 
-    assert(k->ops->realloc_buffer);
+        if (sb->size != wanted_size) {
+            sb->buffer = g_realloc(sb->buffer, wanted_size);
+            sb->size = wanted_size;
+        }
+        return sb->size;
+    }
 
     return k->ops->realloc_buffer(sb);
 }
diff --git a/hw/tpm/tpm_passthrough.c b/hw/tpm/tpm_passthrough.c
index 2efced1..a7da0f8 100644
--- a/hw/tpm/tpm_passthrough.c
+++ b/hw/tpm/tpm_passthrough.c
@@ -258,17 +258,6 @@ static bool tpm_passthrough_get_startup_error(TPMBackend *tb)
     return tpm_pt->had_startup_error;
 }
 
-static size_t tpm_passthrough_realloc_buffer(TPMSizedBuffer *sb)
-{
-    size_t wanted_size = 4096; /* Linux tpm.c buffer size */
-
-    if (sb->size != wanted_size) {
-        sb->buffer = g_realloc(sb->buffer, wanted_size);
-        sb->size = wanted_size;
-    }
-    return sb->size;
-}
-
 static void tpm_passthrough_cancel_cmd(TPMBackend *tb)
 {
     TPMPassthruState *tpm_pt = TPM_PASSTHROUGH(tb);
@@ -470,7 +459,6 @@ static const TPMDriverOps tpm_passthrough_driver = {
     .opts                     = tpm_passthrough_cmdline_opts,
     .desc                     = tpm_passthrough_create_desc,
     .create                   = tpm_passthrough_create,
-    .realloc_buffer           = tpm_passthrough_realloc_buffer,
     .reset                    = tpm_passthrough_reset,
     .had_startup_error        = tpm_passthrough_get_startup_error,
     .cancel_cmd               = tpm_passthrough_cancel_cmd,
-- 
2.7.4