object: is not initialized, yet kobject_put() is being called
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From: Jiri Kosina on 12 Aug 2010 09:20 On Thu, 12 Aug 2010, Alan Ott wrote: > > > > > commit bd25f4dd6972755579d0ea50d1a5ace2e9b00d1a > > > > > Author: Arnd Bergmann<arnd(a)arndb.de> > > > > > 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<arnd(a)arndb.de> > > > > > Cc: Jiri Kosina<jkosina(a)suse.cz> > > > > > Cc: "Greg Kroah-Hartman"<gregkh(a)suse.de> > > > > > Signed-off-by: Jiri Kosina<jkosina(a)suse.cz> > > > > > > > > > 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. -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo(a)vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/ |