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SubjectDevfs races with block devices
[Finally, after other things have stabilised, I'm ready to tackle this
issue]

Alexander Viro writes:
> BTW, here's one more devfs rmmod race: check_disk_changed() in
> fs/devfs/base.c. Calling ->check_media_change() with no protection
> whatsoever. If rmmod happens at that point...

How about if I do this sequence:
lock_kernel();
devfs checks;
if (bd_op->owner)
__MOD_INC_USE_COUNT(bd_op->owner);
revalidate();
if (bd_op->owner)
__MOD_DEC_USE_COUNT(bd_op->owner);
unlock_kernel();
Is there any reason why that won't work?

Regards,

Richard....
Permanent: rgooch@atnf.csiro.au
Current: rgooch@ras.ucalgary.ca
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