[PATCH v2 06/10] hw/tpm: crb: Do not clear internal buffers when backend is busy

[Stefan Berger <stefanb@linux.ibm.com>]

While the backend (thread) is accessing the request and response buffers,
do not clear those buffers upon a command cancellation. Still clear them
in all other cases, though.

Fixes: 29315d22b259 ("hw/tpm: Add internal buffer state for chunking")
Reviewed-by: Marc-André Lureau <marcandre.lureau@redhat.com>
Signed-off-by: Stefan Berger <stefanb@linux.ibm.com>
---
 hw/tpm/tpm_crb.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/hw/tpm/tpm_crb.c b/hw/tpm/tpm_crb.c
index 54fa2042b5..e5e33a3a2f 100644
--- a/hw/tpm/tpm_crb.c
+++ b/hw/tpm/tpm_crb.c
@@ -218,8 +218,9 @@ static void tpm_crb_mmio_write(void *opaque, hwaddr addr,
         if (val == CRB_CANCEL_INVOKE) {
             if (s->regs[R_CRB_CTRL_START] & CRB_START_INVOKE) {
                 tpm_backend_cancel_cmd(s->tpmbe);
+            } else {
+                tpm_crb_clear_internal_buffers(s);
             }
-            tpm_crb_clear_internal_buffers(s);
         }
         break;
     case A_CRB_CTRL_START:
-- 
2.55.0