Re: [PATCH 1/9] tpm: Changed a qemu_mutex_lock to QEMU_LOCK_GUARD

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

On 3/10/21 10:15 PM, Mahmoud Mandour wrote:
> Removed a qemu_mutex_lock() and its respective qemu_mutex_unlock()
> and used QEMU_LOCK_GUARD instead. This simplifies the code by
> eliminiating gotos and removing the qemu_mutex_unlock() calls.
>
> Signed-off-by: Mahmoud Mandour <ma.mandourr@gmail.com>
> ---
>   backends/tpm/tpm_emulator.c | 8 +++-----
>   1 file changed, 3 insertions(+), 5 deletions(-)
>
> diff --git a/backends/tpm/tpm_emulator.c b/backends/tpm/tpm_emulator.c
> index a012adc193..a3c041e402 100644
> --- a/backends/tpm/tpm_emulator.c
> +++ b/backends/tpm/tpm_emulator.c
> @@ -126,7 +126,7 @@ static int tpm_emulator_ctrlcmd(TPMEmulator *tpm, unsigned long cmd, void *msg,
>       uint8_t *buf = NULL;
>       int ret = -1;


ret is not needed anymore


>
> -    qemu_mutex_lock(&tpm->mutex);
> +    QEMU_LOCK_GUARD(&tpm->mutex);
>
>       buf = g_alloca(n);
>       memcpy(buf, &cmd_no, sizeof(cmd_no));
> @@ -134,20 +134,18 @@ static int tpm_emulator_ctrlcmd(TPMEmulator *tpm, unsigned long cmd, void *msg,
>
>       n = qemu_chr_fe_write_all(dev, buf, n);
>       if (n <= 0) {
> -        goto end;
> +        return ret;
>       }
>
>       if (msg_len_out != 0) {
>           n = qemu_chr_fe_read_all(dev, msg, msg_len_out);
>           if (n <= 0) {
> -            goto end;
> +            return ret;
>           }
>       }
>
>       ret = 0;
>
> -end:
> -    qemu_mutex_unlock(&tpm->mutex);
>       return ret;


return 0;



>   }
>