Re: [PATCH scsi-misc-2.6 07/08] scsi: remove bogus {get|put}_device()calls

[Tejun Heo]

 Hi,

James Bottomley wrote:
> On Wed, 2005-03-23 at 11:14 +0900, Tejun Heo wrote:
>
> > 	So, basically, SCSI high-level object (scsi_disk) and
> > 	mid-level object (scsi_device) are reference counted by users,
> > 	not the requests they submit.  Reference count cannot go zero
> > 	with active users and users cannot access the object once the
> > 	reference count reaches zero.
>
>
> Actually, no.  Unfortunately we still have some fire and forget APIs, so
> the contention that we always have an open refcounted descriptor isn't
> always true.

 Yeap, you're right.  So, what we have is

 * All high-level users have open access to the scsi high-level
   object on issueing requests, but may close it before its requests
   complete.
 * All mid-layer users do get_device() before submitting requests,
   but may put_device() before its requests complete.

 Thanks for pointing that out.  :-)

--
tejun

-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/