[SeaBIOS] [PATCH 3/3] tpm: when CRB is active, select, lock it, and check addresses

[Stefan Berger]

Do not just indicate that the probing for the CRB interface was successful
if we find it active. Instead, select it, lock it, and test the addresses
for whether they can be used (must be 32 bit).

Signed-off-by: Stefan Berger 
---
 src/hw/tpm_drivers.c | 4 +---
 1 file changed, 1 insertion(+), 3 deletions(-)

diff --git a/src/hw/tpm_drivers.c b/src/hw/tpm_drivers.c
index b208a37..4278f20 100644
--- a/src/hw/tpm_drivers.c
+++ b/src/hw/tpm_drivers.c
@@ -396,9 +396,7 @@ static u32 crb_probe(void)
     if ((ifaceid & 0xf) != 0xf) {
         if ((ifaceid & 0xf) == 1) {
             /* CRB is active */
-            return 1;
-        }
-        if ((ifaceid & (1 << 14)) == 0) {
+        } else if ((ifaceid & (1 << 14)) == 0) {
             /* CRB cannot be selected */
             return 0;
         }