From 844afc54ae229515a37f63519855661ad2d01d19 Mon Sep 17 00:00:00 2001 From: Greg Kurz Date: Fri, 15 Jun 2018 18:58:00 +0200 Subject: [PATCH] spapr: fix xics_system_init() error path Commit 3d85885a1b1f3 tried to fix error handling, but it actually went into the wrong direction by dropping the local Error *. In the default KVM case, the rationale is to try the in-kernel XICS first, and if not possible, to fallback to userland XICS. Passing errp everywhere makes this fallback impossible if errp is &error_fatal (which happens to be the case). And anyway, if the caller would pass a regular &local_err, things would be worse: we could possibly pass an already set *errp to error_setg() and crash, or return an error even in case of success. So we definitely need a local Error * and only propagate it when we're done with the fallback logic. This is what this patch does. Signed-off-by: Greg Kurz Signed-off-by: David Gibson --- hw/ppc/spapr.c | 22 ++++++++++++++-------- 1 file changed, 14 insertions(+), 8 deletions(-) diff --git a/hw/ppc/spapr.c b/hw/ppc/spapr.c index f59999daac..db0fb385d4 100644 --- a/hw/ppc/spapr.c +++ b/hw/ppc/spapr.c @@ -186,27 +186,33 @@ static int xics_max_server_number(sPAPRMachineState *spapr) static void xics_system_init(MachineState *machine, int nr_irqs, Error **errp) { sPAPRMachineState *spapr = SPAPR_MACHINE(machine); + Error *local_err = NULL; if (kvm_enabled()) { if (machine_kernel_irqchip_allowed(machine) && - !xics_kvm_init(spapr, errp)) { + !xics_kvm_init(spapr, &local_err)) { spapr->icp_type = TYPE_KVM_ICP; - spapr->ics = spapr_ics_create(spapr, TYPE_ICS_KVM, nr_irqs, errp); + spapr->ics = spapr_ics_create(spapr, TYPE_ICS_KVM, nr_irqs, + &local_err); } if (machine_kernel_irqchip_required(machine) && !spapr->ics) { - error_prepend(errp, "kernel_irqchip requested but unavailable: "); - return; + error_prepend(&local_err, + "kernel_irqchip requested but unavailable: "); + goto error; } + error_free(local_err); + local_err = NULL; } if (!spapr->ics) { xics_spapr_init(spapr); spapr->icp_type = TYPE_ICP; - spapr->ics = spapr_ics_create(spapr, TYPE_ICS_SIMPLE, nr_irqs, errp); - if (!spapr->ics) { - return; - } + spapr->ics = spapr_ics_create(spapr, TYPE_ICS_SIMPLE, nr_irqs, + &local_err); } + +error: + error_propagate(errp, local_err); } static int spapr_fixup_cpu_smt_dt(void *fdt, int offset, PowerPCCPU *cpu,