[PATCH v2] lib: sbi: protect dprintf output with spinlock

[Xiang W]

在 2021-08-28星期六的 14:45 +0800，Dong Du写道：
> Avoid getting messages from multiple harts (using dprintf and printf)
> concurrently with a spinlock serializaing calls to sbi_dprintf(),
> sbi_printf() and sbi_puts()
> 
> Signed-off-by: Dong Du <Dd_nirvana at sjtu.edu.cn>

look good to me.
Reviewed-by: Xiang W <wxjstz at 126.com>
> ---
>  lib/sbi/sbi_console.c | 5 ++++-
>  1 file changed, 4 insertions(+), 1 deletion(-)
> 
> diff --git a/lib/sbi/sbi_console.c b/lib/sbi/sbi_console.c
> index b54f7a2..29eede3 100644
> --- a/lib/sbi/sbi_console.c
> +++ b/lib/sbi/sbi_console.c
> @@ -387,8 +387,11 @@ int sbi_dprintf(const char *format, ...)
>         struct sbi_scratch *scratch = sbi_scratch_thishart_ptr();
>  
>         va_start(args, format);
> -       if (scratch->options & SBI_SCRATCH_DEBUG_PRINTS)
> +       if (scratch->options & SBI_SCRATCH_DEBUG_PRINTS) {
> +               spin_lock(&console_out_lock);
>                 retval = print(NULL, NULL, format, args);
> +               spin_unlock(&console_out_lock);
> +       }
>         va_end(args);
>  
>         return retval;
> -- 
> 2.31.1
> 
>