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xen: Use ERRP_GUARD()

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If we want to check error after errp-function call, we need to
introduce local_err and then propagate it to errp. Instead, use
the ERRP_GUARD() macro, benefits are:
1. No need of explicit error_propagate call
2. No need of explicit local_err variable: use errp directly
3. ERRP_GUARD() leaves errp as is if it's not NULL or
   &error_fatal, this means that we don't break error_abort
   (we'll abort on error_set, not on error_propagate)

If we want to add some info to errp (by error_prepend() or
error_append_hint()), we must use the ERRP_GUARD() macro.
Otherwise, this info will not be added when errp == &error_fatal
(the program will exit prior to the error_append_hint() or
error_prepend() call).  No such cases are being fixed here.

This commit is generated by command

    sed -n '/^X86 Xen CPUs$/,/^$/{s/^F: //p}' MAINTAINERS | \
    xargs git ls-files | grep '\.[hc]$' | \
    xargs spatch \
        --sp-file scripts/coccinelle/errp-guard.cocci \
        --macro-file scripts/cocci-macro-file.h \
        --in-place --no-show-diff --max-width 80

Reported-by: Kevin Wolf <kwolf@redhat.com>
Reported-by: Greg Kurz <groug@kaod.org>
Signed-off-by: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com>
Reviewed-by: Philippe Mathieu-Daudé <philmd@redhat.com>
[Commit message tweaked]
Signed-off-by: Markus Armbruster <armbru@redhat.com>
Message-Id: <20200707165037.1026246-9-armbru@redhat.com>
[ERRP_AUTO_PROPAGATE() renamed to ERRP_GUARD(), and
auto-propagated-errp.cocci to errp-guard.cocci.  Commit message
tweaked again.]
This commit is contained in:
Vladimir Sementsov-Ogievskiy 2020-07-07 18:50:37 +02:00 • committed by Markus Armbruster
parent 795d946d07
commit 1de7096d83
8 changed files with 128 additions and 166 deletions
Download patch file Download diff file Expand all files Collapse all files

25
hw/xen/xen_pt.c
View file

@ -777,12 +777,12 @@ static void xen_pt_destroy(PCIDevice *d) {
static void xen_pt_realize(PCIDevice *d, Error **errp)
{
ERRP_GUARD();
XenPCIPassthroughState *s = XEN_PT_DEVICE(d);
int i, rc = 0;
uint8_t machine_irq = 0, scratch;
uint16_t cmd = 0;
int pirq = XEN_PT_UNASSIGNED_PIRQ;
Error *err = NULL;
/* register real device */
XEN_PT_LOG(d, "Assigning real physical device %02x:%02x.%d"
@ -793,10 +793,9 @@ static void xen_pt_realize(PCIDevice *d, Error **errp)
xen_host_pci_device_get(&s->real_device,
s->hostaddr.domain, s->hostaddr.bus,
s->hostaddr.slot, s->hostaddr.function,
&err);
if (err) {
error_append_hint(&err, "Failed to \"open\" the real pci device");
error_propagate(errp, err);
errp);
if (*errp) {
error_append_hint(errp, "Failed to \"open\" the real pci device");
return;
}
@ -823,11 +822,10 @@ static void xen_pt_realize(PCIDevice *d, Error **errp)
return;
}
xen_pt_setup_vga(s, &s->real_device, &err);
if (err) {
error_append_hint(&err, "Setup VGA BIOS of passthrough"
" GFX failed");
error_propagate(errp, err);
xen_pt_setup_vga(s, &s->real_device, errp);
if (*errp) {
error_append_hint(errp, "Setup VGA BIOS of passthrough"
" GFX failed");
xen_host_pci_device_put(&s->real_device);
return;
}
@ -840,10 +838,9 @@ static void xen_pt_realize(PCIDevice *d, Error **errp)
xen_pt_register_regions(s, &cmd);
/* reinitialize each config register to be emulated */
xen_pt_config_init(s, &err);
if (err) {
error_append_hint(&err, "PCI Config space initialisation failed");
error_propagate(errp, err);
xen_pt_config_init(s, errp);
if (*errp) {
error_append_hint(errp, "PCI Config space initialisation failed");
rc = -1;
goto err_out;
}