Re: [PATCH 7/9] s390/block/dcssblk: add error handling support for add_disk()

[Heiko Carstens <hca@linux.ibm.com>]

On Mon, Sep 13, 2021 at 09:53:14AM -0700, Luis Chamberlain wrote:
> On Mon, Sep 06, 2021 at 01:43:46PM +0200, Gerald Schaefer wrote:
> > On Fri, 3 Sep 2021 18:46:26 -0700
> > Luis Chamberlain <mcgrof@kernel.org> wrote:
> > 
> > > On Fri, Sep 03, 2021 at 04:08:48PM +0200, Heiko Carstens wrote:
> > > > On Thu, Sep 02, 2021 at 10:41:03AM -0700, Luis Chamberlain wrote:
> > > > > We never checked for errors on add_disk() as this function
> > > > > returned void. Now that this is fixed, use the shiny new
> > > > > error handling.
> > > > > 
> > > > > Signed-off-by: Luis Chamberlain <mcgrof@kernel.org>
> > > > > ---
> > > > >  drivers/s390/block/dcssblk.c | 4 +++-
> > > > >  1 file changed, 3 insertions(+), 1 deletion(-)
> > > > > 
> > > > > diff --git a/drivers/s390/block/dcssblk.c b/drivers/s390/block/dcssblk.c
> > > > > index 5be3d1c39a78..b0fd5009a12e 100644
> > > > > --- a/drivers/s390/block/dcssblk.c
> > > > > +++ b/drivers/s390/block/dcssblk.c
> > > > > @@ -696,7 +696,9 @@ dcssblk_add_store(struct device *dev, struct device_attribute *attr, const char
> > > > >  	}
> > > > >  
> > > > >  	get_device(&dev_info->dev);
> > > > > -	device_add_disk(&dev_info->dev, dev_info->gd, NULL);
> > > > > +	rc = device_add_disk(&dev_info->dev, dev_info->gd, NULL);
> > > > > +	if (rc)
> > > > > +		goto put_dev;
> > > > 
> > > > This looks not correct to me. We seem to have now in case of an error:
> > > > 
> > > > - reference count imbalance (= memory leak)
> > > > - dax cleanup is missing
> > > 
> > > Care to provide an alternative?
> > 
> > See patch below:
> 
> Thanks! Will you queue this up on your end or do would you
> prefer for me to roll this into my tree and eventually resend
> with the rest?

Please add the patch to your tree.