Re: [Qemu-devel] [PATCH 1/2] ide: ide-cd without drive property for empty drive

[Kevin Wolf]

Am 14.07.2016 um 21:48 hat Eric Blake geschrieben:
> On 07/14/2016 07:49 AM, Kevin Wolf wrote:
> > This allows to create an empty ide-cd device without manually creating a
> > BlockBackend.
> > 
> > Signed-off-by: Kevin Wolf <address@hidden>
> > ---
> >  hw/ide/qdev.c | 20 +++++++++++++++-----
> >  1 file changed, 15 insertions(+), 5 deletions(-)
> 
> > @@ -158,6 +154,16 @@ static int ide_dev_initfn(IDEDevice *dev, IDEDriveKind 
> > kind)
> >      IDEState *s = bus->ifs + dev->unit;
> >      Error *err = NULL;
> >  
> > +    if (!dev->conf.blk) {
> > +        if (kind != IDE_CD) {
> > +            error_report("No drive specified");
> > +            return -1;
> > +        } else {
> > +            /* Anonymous BlockBackend for an empty drive */
> > +            dev->conf.blk = blk_new();
> 
> So we either fail or dev->conf.blk is set...
> 
> > +        }
> > +    }
> > +
> >      if (dev->conf.discard_granularity == -1) {
> >          dev->conf.discard_granularity = 512;
> >      } else if (dev->conf.discard_granularity &&
> > @@ -257,7 +263,11 @@ static int ide_cd_initfn(IDEDevice *dev)
> >  
> >  static int ide_drive_initfn(IDEDevice *dev)
> >  {
> > -    DriveInfo *dinfo = blk_legacy_dinfo(dev->conf.blk);
> > +    DriveInfo *dinfo = NULL;
> > +
> > +    if (dev->conf.blk) {
> > +        dinfo = blk_legacy_dinfo(dev->conf.blk);
> > +    }
> >  
> >      return ide_dev_initfn(dev, dinfo && dinfo->media_cd ? IDE_CD : IDE_HD);
> 
> ...yet, this claims dev->conf.blk can be NULL.  What am I missing?

That ide_drive_initfn() is the outer function and runs first, before we
handle the case in ide_dev_initfn()?

Kevin

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