Re: [BUG] object: is not initialized, yet kobject_put() is being called

On Thu, 12 Aug 2010, Alan Ott wrote:

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commit bd25f4dd6972755579d0ea50d1a5ace2e9b00d1a
Author: Arnd Bergmann[off-list ref]
Date:   Sun Jul 11 15:34:05 2010 +0200

     HID: hiddev: use usb_find_interface, get rid of BKL

     This removes the private hiddev_table in the usbhid
     driver and changes it to use usb_find_interface
     instead.

     The advantage is that we can avoid the race between
     usb_register_dev and usb_open and no longer need the
     big kernel lock.

     This doesn't introduce race condition -- the intf pointer could
be
     invalidated only in hiddev_disconnect() through
usb_deregister_dev(),
     but that will block on minor_rwsem and not actually remove the
device
     until usb_open().

     Signed-off-by: Arnd Bergmann[off-list ref]
     Cc: Jiri Kosina[off-list ref]
     Cc: "Greg Kroah-Hartman"[off-list ref]
     Signed-off-by: Jiri Kosina[off-list ref]
         

Thanks, I had my suspicion about this commit (that's why I asked to you
verify with CONFIG_USB_HIDDEV turned off as well).

Adding Arnd to CC and will look into it myself as well soon.

Arnd, the complete thread can be found at
http://lkml.org/lkml/2010/8/10/280
       

Could please those of you, who are able to reproduce the problem, verify
whether the patch below (completely untested) makes everything behave
again? Thanks.
     

Yes, everything behaves again. Thanks Jiri.
   

Seconded. Works good. Thanks for your support Jiri.

Thanks for your testing. I still need to think a little bit more about 
whether this is indeed an appropriate fix or there might be still some 
problem.

Once I will be applying this, I will put

	Reported-and-tested-by: 

tag for both of you Alan and Markus, is that fine?

Thanks,

-- 
Jiri Kosina
SUSE Labs, Novell Inc.