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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/mem/pc-dimm.c
View file

@ -44,24 +44,24 @@ void pc_dimm_pre_plug(PCDIMMDevice *dimm, MachineState *machine,
&error_abort);
if ((slot < 0 || slot >= machine->ram_slots) &&
slot != PC_DIMM_UNASSIGNED_SLOT) {
error_setg(&local_err, "invalid slot number %d, valid range is [0-%"
PRIu64 "]", slot, machine->ram_slots - 1);
goto out;
error_setg(errp,
"invalid slot number %d, valid range is [0-%" PRIu64 "]",
slot, machine->ram_slots - 1);
return;
}
slot = pc_dimm_get_free_slot(slot == PC_DIMM_UNASSIGNED_SLOT ? NULL : &slot,
machine->ram_slots, &local_err);
if (local_err) {
goto out;
error_propagate(errp, local_err);
return;
}
object_property_set_int(OBJECT(dimm), PC_DIMM_SLOT_PROP, slot,
&error_abort);
trace_mhp_pc_dimm_assigned_slot(slot);
memory_device_pre_plug(MEMORY_DEVICE(dimm), machine, legacy_align,
&local_err);
out:
error_propagate(errp, local_err);
errp);
}
void pc_dimm_plug(PCDIMMDevice *dimm, MachineState *machine, Error **errp)