The returned error is only used to check for success, so no reason
to use specific errno values.

Also, this is the only function with -errno contract in the file,
so converting it simplifies the whole file from three types of
contract (0/-1, 0/-errno, true/false) to only two (0/-1, true/false).

Signed-off-by: Vladimir Sementsov-Ogievskiy <vsementsov@yandex-team.ru>
---
 backends/tpm/tpm_emulator.c | 13 +++++--------
 1 file changed, 5 insertions(+), 8 deletions(-)

diff --git a/backends/tpm/tpm_emulator.c b/backends/tpm/tpm_emulator.c
index 79f3e6b1f2..3c62bfa3ed 100644
--- a/backends/tpm/tpm_emulator.c
+++ b/backends/tpm/tpm_emulator.c
@@ -885,10 +885,8 @@ static int tpm_emulator_set_state_blob(TPMEmulator *tpm_emu,
 
 /*
  * Set all the TPM state blobs.
- *
- * Returns a negative errno code in case of error.
  */
-static int tpm_emulator_set_state_blobs(TPMBackend *tb, Error **errp)
+static bool tpm_emulator_set_state_blobs(TPMBackend *tb, Error **errp)
 {
     TPMEmulator *tpm_emu = TPM_EMULATOR(tb);
     TPMBlobBuffers *state_blobs = &tpm_emu->state_blobs;
@@ -897,7 +895,7 @@ static int tpm_emulator_set_state_blobs(TPMBackend *tb, Error **errp)
 
     if (tpm_emulator_stop_tpm(tb, errp) < 0) {
         trace_tpm_emulator_set_state_blobs_error("Could not stop TPM");
-        return -EIO;
+        return false;
     }
 
     if (tpm_emulator_set_state_blob(tpm_emu, PTM_BLOB_TYPE_PERMANENT,
@@ -909,12 +907,12 @@ static int tpm_emulator_set_state_blobs(TPMBackend *tb, Error **errp)
         tpm_emulator_set_state_blob(tpm_emu, PTM_BLOB_TYPE_SAVESTATE,
                                     &state_blobs->savestate,
                                     state_blobs->savestate_flags, errp) < 0) {
-        return -EIO;
+        return false;
     }
 
     trace_tpm_emulator_set_state_blobs_done();
 
-    return 0;
+    return true;
 }
 
 static int tpm_emulator_pre_save(void *opaque)
@@ -959,8 +957,7 @@ static bool tpm_emulator_post_load(void *opaque, int version_id, Error **errp)
     TPMBackend *tb = opaque;
     int ret;
 
-    ret = tpm_emulator_set_state_blobs(tb, errp);
-    if (ret < 0) {
+    if (!tpm_emulator_set_state_blobs(tb, errp)) {
         return false;
     }
 
-- 
2.48.1

On 11/6/25 2:41 PM, Vladimir Sementsov-Ogievskiy wrote:
> The returned error is only used to check for success, so no reason
> to use specific errno values.
> 
> Also, this is the only function with -errno contract in the file,
> so converting it simplifies the whole file from three types of
> contract (0/-1, 0/-errno, true/false) to only two (0/-1, true/false).
> 
> Signed-off-by: Vladimir Sementsov-Ogievskiy <vsementsov@yandex-team.ru>
> ---
>   backends/tpm/tpm_emulator.c | 13 +++++--------
>   1 file changed, 5 insertions(+), 8 deletions(-)
> 
> diff --git a/backends/tpm/tpm_emulator.c b/backends/tpm/tpm_emulator.c
> index 79f3e6b1f2..3c62bfa3ed 100644
> --- a/backends/tpm/tpm_emulator.c
> +++ b/backends/tpm/tpm_emulator.c
> @@ -885,10 +885,8 @@ static int tpm_emulator_set_state_blob(TPMEmulator *tpm_emu,
>   
>   /*
>    * Set all the TPM state blobs.
> - *
> - * Returns a negative errno code in case of error.
>    */
> -static int tpm_emulator_set_state_blobs(TPMBackend *tb, Error **errp)
> +static bool tpm_emulator_set_state_blobs(TPMBackend *tb, Error **errp)
>   {
>       TPMEmulator *tpm_emu = TPM_EMULATOR(tb);
>       TPMBlobBuffers *state_blobs = &tpm_emu->state_blobs;
> @@ -897,7 +895,7 @@ static int tpm_emulator_set_state_blobs(TPMBackend *tb, Error **errp)
>   
>       if (tpm_emulator_stop_tpm(tb, errp) < 0) {
>           trace_tpm_emulator_set_state_blobs_error("Could not stop TPM");
> -        return -EIO;
> +        return false;
>       }
>   
>       if (tpm_emulator_set_state_blob(tpm_emu, PTM_BLOB_TYPE_PERMANENT,
> @@ -909,12 +907,12 @@ static int tpm_emulator_set_state_blobs(TPMBackend *tb, Error **errp)
>           tpm_emulator_set_state_blob(tpm_emu, PTM_BLOB_TYPE_SAVESTATE,
>                                       &state_blobs->savestate,
>                                       state_blobs->savestate_flags, errp) < 0) {
> -        return -EIO;
> +        return false;
>       }
>   
>       trace_tpm_emulator_set_state_blobs_done();
>   
> -    return 0;
> +    return true;
>   }
>   
>   static int tpm_emulator_pre_save(void *opaque)
> @@ -959,8 +957,7 @@ static bool tpm_emulator_post_load(void *opaque, int version_id, Error **errp)
>       TPMBackend *tb = opaque;
>       int ret;
>   
> -    ret = tpm_emulator_set_state_blobs(tb, errp);
> -    if (ret < 0) {
> +    if (!tpm_emulator_set_state_blobs(tb, errp)) {
>           return false;
>       }
>   

Reviewed-by: Stefan Berger <stefanb@linux.ibm.com>