On Tue, Apr 25, 2006 at 08:53:16PM +0400, Artem B. Bityutskiy wrote:
> Hello,
>
> last time I tried to use "bare" sysfs functions to create my sysfs
> hierarchy I ended up with a problem that the module refcount is not
> increased when those sysfs files are opened. So I could open a sysfs
> file from userspace, do rmmod and enjoy oops.
>
> Then I started using the class and class_device stuff, which have an
> .owner field, and all became fine.
>
> I'm not sure if this is a problem of sysfs, but I suspect it could take
> care of module refcount better.
>
> In your patch, I looked for THIS_MODULE pattern and did not find. I did
> not try, but I suspect your code is not devoid of the problem I
> described. So, this is just FYI and may be not the case.
Others have also alluded to /sys/fs/ races that we'll probably need to
resolve. In this case the question is more about umount than rmmod since
the mount should reference the module.
Thanks,
Dave
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