Re: [PATCH 1/3] block: Simplify qmp_block_resize() error paths

[Kevin Wolf <kwolf@redhat.com>]

Am 08.12.2020 um 15:15 hat Vladimir Sementsov-Ogievskiy geschrieben:
> 03.12.2020 20:23, Kevin Wolf wrote:
> > The only thing that happens after the 'out:' label is blk_unref(blk).
> > However, blk = NULL in all of the error cases, so instead of jumping to
> > 'out:', we can just return directly.
> > 
> > Cc: qemu-stable@nongnu.org
> > Signed-off-by: Kevin Wolf <kwolf@redhat.com>
> > ---
> >   blockdev.c | 7 +++----
> >   1 file changed, 3 insertions(+), 4 deletions(-)
> > 
> > diff --git a/blockdev.c b/blockdev.c
> > index fe6fb5dc1d..229d2cce1b 100644
> > --- a/blockdev.c
> > +++ b/blockdev.c
> > @@ -2468,17 +2468,17 @@ void coroutine_fn qmp_block_resize(bool has_device, const char *device,
> >       if (size < 0) {
> >           error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "size", "a >0 size");
> > -        goto out;
> > +        return;
> >       }
> >       if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_RESIZE, NULL)) {
> >           error_setg(errp, QERR_DEVICE_IN_USE, device);
> > -        goto out;
> > +        return;
> >       }
> >       blk = blk_new_with_bs(bs, BLK_PERM_RESIZE, BLK_PERM_ALL, errp);
> >       if (!blk) {
> > -        goto out;
> > +        return;
> >       }
> >       bdrv_drained_begin(bs);
> > @@ -2487,7 +2487,6 @@ void coroutine_fn qmp_block_resize(bool has_device, const char *device,
> >       bdrv_co_leave(bs, old_ctx);
> >       bdrv_drained_end(bs);
> > -out:
> >       bdrv_co_lock(bs);
> >       blk_unref(blk);
> >       bdrv_co_unlock(bs);
> > 
> 
> Initialization of blk to NULL becomes redundant with this patch, so
> may be dropped too.

Good catch, I'll change this while applying.

Kevin