On Mon, 16 Jun 2003, Russell King wrote:
> On Mon, Jun 16, 2003 at 10:08:26AM -0700, Greg KH wrote:
> > Then don't let your module unload until _all_ instances of your
> > structures are gone. You can tell if this is true or not, it's just up
> > to the implementor :)
>
> Greg, I believe Alan does have a valid concern. Eg, how is the following
> handled?
>
> - PCI device driver module is loaded
> - device driver gets handed a pci device
> - device driver attaches a file to the struct device corresponding to the
> PCI device.
with old procfs one would like to set the owner field of the
corresponding struct proc_dir_entry and/or file_operations at this point.
> - userspace opens new file (this does not increment the device drivers
> use count.)
given owner=THIS_MODULE was set, this would bump the module's use count
> - device driver is rmmod'd
and this could never happen while the procfs file (or directory) is still
referenced
> - device driver removes its references to the pci device
> - device driver unloads
> - user reads from opened file.
Admittedly I haven't looked deeper into sysfs yet, but I was under the
assumption/hope there would be a similar approach to make module
refcounting working there?
Martin
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This archive was generated by hypermail 2b29 : Mon Jun 23 2003 - 22:00:18 EST