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spapr: Simplify error handling in spapr_phb_realize()

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The spapr_phb_realize() function has a local_err variable which
is used to:

1) check failures of spapr_irq_findone() and spapr_irq_claim()

2) prepend extra information to the error message

Recent work from Markus Armbruster highlighted we get better
code when testing the return value of a function, rather than
setting up all the local_err boiler plate. For similar reasons,
it is now preferred to use ERRP_GUARD() and error_prepend()
rather than error_propagate_prepend().

Since spapr_irq_findone() and spapr_irq_claim() return negative
values in case of failure, do both changes.

This is just cleanup, no functional impact.

Signed-off-by: Greg Kurz <groug@kaod.org>
Reviewed-by: Markus Armbruster <armbru@redhat.com>
Reviewed-by: David Gibson <david@gibson.dropbear.id.au>
Message-Id: <159707843851.1489912.6108405733810934642.stgit@bahia.lan>
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
This commit is contained in:
Greg Kurz 2020-08-10 18:53:58 +02:00 committed by David Gibson
parent a490711934
commit 4a6891b838
1 changed files with 7 additions and 9 deletions
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16
hw/ppc/spapr_pci.c
View file

@ -1796,6 +1796,7 @@ static void spapr_phb_destroy_msi(gpointer opaque)
static void spapr_phb_realize(DeviceState *dev, Error **errp)
{
ERRP_GUARD();
/* We don't use SPAPR_MACHINE() in order to exit gracefully if the user
* tries to add a sPAPR PHB to a non-pseries machine.
*/
@ -1813,7 +1814,6 @@ static void spapr_phb_realize(DeviceState *dev, Error **errp)
uint64_t msi_window_size = 4096;
SpaprTceTable *tcet;
const unsigned windows_supported = spapr_phb_windows_supported(sphb);
Error *local_err = NULL;
if (!spapr) {
error_setg(errp, TYPE_SPAPR_PCI_HOST_BRIDGE " needs a pseries machine");
@ -1964,13 +1964,12 @@ static void spapr_phb_realize(DeviceState *dev, Error **errp)
/* Initialize the LSI table */
for (i = 0; i < PCI_NUM_PINS; i++) {
uint32_t irq = SPAPR_IRQ_PCI_LSI + sphb->index * PCI_NUM_PINS + i;
int irq = SPAPR_IRQ_PCI_LSI + sphb->index * PCI_NUM_PINS + i;
if (smc->legacy_irq_allocation) {
irq = spapr_irq_findone(spapr, &local_err);
if (local_err) {
error_propagate_prepend(errp, local_err,
"can't allocate LSIs: ");
irq = spapr_irq_findone(spapr, errp);
if (irq < 0) {
error_prepend(errp, "can't allocate LSIs: ");
/*
* Older machines will never support PHB hotplug, ie, this is an
* init only path and QEMU will terminate. No need to rollback.
@ -1979,9 +1978,8 @@ static void spapr_phb_realize(DeviceState *dev, Error **errp)
}
}
spapr_irq_claim(spapr, irq, true, &local_err);
if (local_err) {
error_propagate_prepend(errp, local_err, "can't allocate LSIs: ");
if (spapr_irq_claim(spapr, irq, true, errp) < 0) {
error_prepend(errp, "can't allocate LSIs: ");
goto unrealize;
}