[Skiboot] [PATCH] FSP/CONSOLE: Do not enable input irq in write path

[Samuel Mendoza-Jonas]

On Thu, 2017-06-01 at 21:13 +0530, Vasant Hegde wrote:
> We use irq for reading input from console, but not in output path.
> Hence do not enable input irq in write path.
> 
> Fixes : 583c8203 (fsp/console: Allocate irq for each hvc console)
> CC: Sam Mendoza-Jonas <sam at mendozajonas.com>
> Signed-off-by: Vasant Hegde <hegdevasant at linux.vnet.ibm.com>

As encountered by Stewart, fixes a soft-lockup on ZZ with a 4.12.1
kernel.

Acked-By: Samuel Mendoza-Jonas <sam at mendozajonas.com> 

> ---
>  hw/fsp/fsp-console.c | 3 ---
>  1 file changed, 3 deletions(-)
> 
> diff --git a/hw/fsp/fsp-console.c b/hw/fsp/fsp-console.c
> index 8eaf7b8..fd67b20 100644
> --- a/hw/fsp/fsp-console.c
> +++ b/hw/fsp/fsp-console.c
> @@ -193,7 +193,6 @@ static size_t fsp_write_vserial(struct fsp_serial *fs, const char *buf,
>  #ifndef DISABLE_CON_PENDING_EVT
>  	opal_update_pending_evt(OPAL_EVENT_CONSOLE_OUTPUT,
>  				OPAL_EVENT_CONSOLE_OUTPUT);
> -	opal_update_pending_evt(fs->irq, fs->irq);
>  #endif
>  	return len;
>  }
> @@ -746,12 +745,10 @@ void fsp_console_poll(void *data __unused)
>  			if (!fs->open)
>  				continue;
>  			if (sb->next_out == sb->next_in) {
> -				opal_update_pending_evt(fs->irq, 0);
>  				continue;
>  			}
>  			if (fs->log_port) {
>  				flush_console();
> -				opal_update_pending_evt(fs->irq, 0);
>  			} else {
>  #ifdef OPAL_DEBUG_CONSOLE_POLL
>  				if (debug < 5) {