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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

14
hw/ppc/spapr_pci.c
View file

@ -1499,10 +1499,10 @@ static void spapr_pci_plug(HotplugHandler *plug_handler,
* we need to let them know it's not enabled
*/
if (plugged_dev->hotplugged) {
error_setg(&local_err, QERR_BUS_NO_HOTPLUG,
error_setg(errp, QERR_BUS_NO_HOTPLUG,
object_get_typename(OBJECT(phb)));
}
goto out;
return;
}
g_assert(drc);
@ -1517,15 +1517,16 @@ static void spapr_pci_plug(HotplugHandler *plug_handler,
*/
if (plugged_dev->hotplugged && bus->devices[PCI_DEVFN(slotnr, 0)] &&
PCI_FUNC(pdev->devfn) != 0) {
error_setg(&local_err, "PCI: slot %d function 0 already ocuppied by %s,"
error_setg(errp, "PCI: slot %d function 0 already ocuppied by %s,"
" additional functions can no longer be exposed to guest.",
slotnr, bus->devices[PCI_DEVFN(slotnr, 0)]->name);
goto out;
return;
}
spapr_drc_attach(drc, DEVICE(pdev), &local_err);
if (local_err) {
goto out;
error_propagate(errp, local_err);
return;
}
/* If this is function 0, signal hotplug for all the device functions.
@ -1551,9 +1552,6 @@ static void spapr_pci_plug(HotplugHandler *plug_handler,
}
}
}
out:
error_propagate(errp, local_err);
}
static void spapr_pci_bridge_unplug(SpaprPhbState *phb,