Re: [Drbd-dev] [PATCH] Added missing kref_debug_put()'s on failure path of drbd_create_device().

[Philipp Reisner <philipp.reisner@linbit.com>]

Hi Johannes,

Ok, I realized that you based it on the other path you sent on May 22.

Thanks for both, both applied!

best regards,
 phil


Am Montag, 18. Juni 2018, 11:26:34 CEST schrieb Philipp Reisner:
> Hi Johannes,
> 
> the patch does not apply to the current master. Can you find out why, or
> find out against which version/Git Hash this patch was created?
> 
> best regards,
>  Phil
> 
> Am Mittwoch, 30. Mai 2018, 17:37:27 CEST schrieb johannes@johannesthoma.com:
> > From: Johannes Thoma <johannes@johannesthoma.com>
> > 
> > On failing late in drbd_create_device() some kref_debug_put()'s
> > were missing, which lead to false positives on kref_debug_destroy().
> > 
> > This patch adds the missing calls.
> > 
> > Signed-off-by: Johannes Thoma <johannes@johannesthoma.com>
> > ---
> > 
> >  drbd/drbd_main.c | 6 ++++++
> >  1 file changed, 6 insertions(+)
> > 
> > diff --git a/drbd/drbd_main.c b/drbd/drbd_main.c
> > index 04ec052..ba60e3b 100644
> > --- a/drbd/drbd_main.c
> > +++ b/drbd/drbd_main.c
> > 
> > @@ -3762,11 +3762,14 @@ out_remove_peer_device:
> >  		kfree(peer_device);
> >  		kref_debug_put(&connection->kref_debug, 3);
> >  		kref_put(&connection->kref, drbd_destroy_connection);
> > 
> > +		kref_debug_put(&device->kref_debug, 1);
> > 
> >  	}
> >  	idr_remove(&resource->devices, vnr);
> > 
> > +	kref_debug_put(&device->kref_debug, 1);
> > 
> >  out_idr_remove_minor:
> >  	idr_remove(&drbd_devices, minor);
> > 
> > +	kref_debug_put(&device->kref_debug, 1);
> > 
> >  out_no_minor_idr:
> >  	if (locked)
> >  	
> >  		spin_unlock_irq(&resource->req_lock);
> > 
> > @@ -3787,6 +3790,9 @@ out_no_disk:
> >  	blk_cleanup_queue(q);
> >  
> >  out_no_q:
> >  	kref_put(&resource->kref, drbd_destroy_resource);
> > 
> > +	kref_debug_put(&resource->kref_debug, 4);
> > +		/* kref debugging wants an extra put, see has_refs() */
> > +	kref_debug_put(&device->kref_debug, 4);
> > 
> >  	kref_debug_destroy(&device->kref_debug);
> >  	kfree(device);
> >  	return err;


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