motorhead/qemu
1
0
Fork 0
mirror of https://github.com/Motorhead1991/qemu.git synced 2025-08-02 15:23:53 -06:00
Code Issues Projects Releases Packages Wiki Activity Actions

error: Fix use of error_prepend() with &error_fatal, &error_abort

Browse source 
From include/qapi/error.h:

  * Pass an existing error to the caller with the message modified:
  *     error_propagate(errp, err);
  *     error_prepend(errp, "Could not frobnicate '%s': ", name);

Fei Li pointed out that doing error_propagate() first doesn't work
well when @errp is &error_fatal or &error_abort: the error_prepend()
is never reached.

Since I doubt fixing the documentation will stop people from getting
it wrong, introduce error_propagate_prepend(), in the hope that it
lures people away from using its constituents in the wrong order.
Update the instructions in error.h accordingly.

Convert existing error_prepend() next to error_propagate to
error_propagate_prepend().  If any of these get reached with
&error_fatal or &error_abort, the error messages improve.  I didn't
check whether that's the case anywhere.

Cc: Fei Li <fli@suse.com>
Signed-off-by: Markus Armbruster <armbru@redhat.com>
Reviewed-by: Philippe Mathieu-Daudé <philmd@redhat.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
Message-Id: <20181017082702.5581-2-armbru@redhat.com>
This commit is contained in:
Markus Armbruster 2018-10-17 10:26:25 +02:00
parent d7ecf71238
commit 4b5766488f
13 changed files with 61 additions and 33 deletions
Download patch file Download diff file Expand all files Collapse all files

4
block/qcow2.c
View file

@ -2208,8 +2208,8 @@ static void coroutine_fn qcow2_co_invalidate_cache(BlockDriverState *bs,
qemu_co_mutex_unlock(&s->lock);
qobject_unref(options);
if (local_err) {
error_propagate(errp, local_err);
error_prepend(errp, "Could not reopen qcow2 layer: ");
error_propagate_prepend(errp, local_err,
"Could not reopen qcow2 layer: ");
bs->drv = NULL;
return;
} else if (ret < 0) {