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error: Avoid unnecessary error_propagate() after error_setg()

Browse source 
Replace

    error_setg(&err, ...);
    error_propagate(errp, err);

by

    error_setg(errp, ...);

Related pattern:

    if (...) {
        error_setg(&err, ...);
        goto out;
    }
    ...
 out:
    error_propagate(errp, err);
    return;

When all paths to label out are that way, replace by

    if (...) {
        error_setg(errp, ...);
        return;
    }

and delete the label along with the error_propagate().

When we have at most one other path that actually needs to propagate,
and maybe one at the end that where propagation is unnecessary, e.g.

    foo(..., &err);
    if (err) {
        goto out;
    }
    ...
    bar(..., &err);
 out:
    error_propagate(errp, err);
    return;

move the error_propagate() to where it's needed, like

    if (...) {
        foo(..., &err);
        error_propagate(errp, err);
        return;
    }
    ...
    bar(..., errp);
    return;

and transform the error_setg() as above.

In some places, the transformation results in obviously unnecessary
error_propagate().  The next few commits will eliminate them.

Bonus: the elimination of gotos will make later patches in this series
easier to review.

Candidates for conversion tracked down with this Coccinelle script:

    @@
    identifier err, errp;
    expression list args;
    @@
    -    error_setg(&err, args);
    +    error_setg(errp, args);
         ... when != err
         error_propagate(errp, err);

Signed-off-by: Markus Armbruster <armbru@redhat.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
Message-Id: <20200707160613.848843-34-armbru@redhat.com>
This commit is contained in:
Markus Armbruster 2020-07-07 18:06:01 +02:00
parent 0c0e618d23
commit dcfe480544
24 changed files with 169 additions and 242 deletions
Download patch file Download diff file Expand all files Collapse all files

35
hw/i386/pc.c
View file

@ -1327,7 +1327,6 @@ out:
static void pc_memory_unplug_request(HotplugHandler *hotplug_dev,
DeviceState *dev, Error **errp)
{
Error *local_err = NULL;
PCMachineState *pcms = PC_MACHINE(hotplug_dev);
/*
@ -1336,21 +1335,18 @@ static void pc_memory_unplug_request(HotplugHandler *hotplug_dev,
* addition to cover this case.
*/
if (!pcms->acpi_dev || !x86_machine_is_acpi_enabled(X86_MACHINE(pcms))) {
error_setg(&local_err,
error_setg(errp,
"memory hotplug is not enabled: missing acpi device or acpi disabled");
goto out;
return;
}
if (object_dynamic_cast(OBJECT(dev), TYPE_NVDIMM)) {
error_setg(&local_err,
"nvdimm device hot unplug is not supported yet.");
goto out;
error_setg(errp, "nvdimm device hot unplug is not supported yet.");
return;
}
hotplug_handler_unplug_request(HOTPLUG_HANDLER(pcms->acpi_dev), dev,
&local_err);
out:
error_propagate(errp, local_err);
errp);
}
static void pc_memory_unplug(HotplugHandler *hotplug_dev,
@ -1430,31 +1426,23 @@ static void pc_cpu_unplug_request_cb(HotplugHandler *hotplug_dev,
DeviceState *dev, Error **errp)
{
int idx = -1;
Error *local_err = NULL;
X86CPU *cpu = X86_CPU(dev);
PCMachineState *pcms = PC_MACHINE(hotplug_dev);
if (!pcms->acpi_dev) {
error_setg(&local_err, "CPU hot unplug not supported without ACPI");
goto out;
error_setg(errp, "CPU hot unplug not supported without ACPI");
return;
}
pc_find_cpu_slot(MACHINE(pcms), cpu->apic_id, &idx);
assert(idx != -1);
if (idx == 0) {
error_setg(&local_err, "Boot CPU is unpluggable");
goto out;
error_setg(errp, "Boot CPU is unpluggable");
return;
}
hotplug_handler_unplug_request(HOTPLUG_HANDLER(pcms->acpi_dev), dev,
&local_err);
if (local_err) {
goto out;
}
out:
error_propagate(errp, local_err);
errp);
}
static void pc_cpu_unplug_cb(HotplugHandler *hotplug_dev,
@ -1867,10 +1855,9 @@ static void pc_machine_set_max_ram_below_4g(Object *obj, Visitor *v,
return;
}
if (value > 4 * GiB) {
error_setg(&error,
error_setg(errp,
"Machine option 'max-ram-below-4g=%"PRIu64
"' expects size less than or equal to 4G", value);
error_propagate(errp, error);
return;
}