On 2019-01-18 12:42, Janosch Frank wrote:
> We need to properly implement interrupt handling for SCLP, because on
> z/VM and LPAR SCLP calls are not synchronous!
>
> Also with smp CPUs have to compete for sclp. Let's add some locking,
> so they execute sclp calls in an orderly fashion and don't compete for
> the data buffer.
>
> Signed-off-by: Janosch Frank <frankja@xxxxxxxxxxxxx>
> ---
[...]
> static void sclp_read_scp_info(ReadInfo *ri, int length)
> {
> unsigned int commands[] = { SCLP_CMDW_READ_SCP_INFO_FORCED,
> SCLP_CMDW_READ_SCP_INFO };
> - int i;
> + int i, cc;
>
> for (i = 0; i < ARRAY_SIZE(commands); i++) {
> + sclp_mark_busy();
> memset(&ri->h, 0, sizeof(ri->h));
> ri->h.length = length;
>
> - if (sclp_service_call(commands[i], ri))
> + cc = sclp_service_call(commands[i], ri);
> + if (cc)
> break;
Nit: The introduction of the cc variable now does not seem to be
necessary anymore. (but there's IMHO no need to respin the series just
because of that)
Reviewed-by: Thomas Huth <thuth@xxxxxxxxxx>
