On Wed, Aug 29, 2012 at 7:11 AM, Eric Dumazet <eric.duma...@gmail.com> wrote:
> I'll polish this patch once LKS/LPC is over...
It should oops in the following way (excuse Gmail please):
PDEO is removed from lists
->pde_users is 0
PDE won't be in purge queue -- no ->release while module is alive
Current code removes PDEO and checks if PDE scheduled for removal atomically.
proc_reg_release remove_proc_entry
de->proc_fops = NULL;
release = pde_opener_del(inode, file);
rcu_read_lock();
synchronize_rcu();
fops = rcu_dereference(pde->proc_fops);
if (!fops) {
rcu_read_unlock();
----------------------------------
/* NOP */
while
(atomic_read(&de->pde_users))
...
/* NOP */
pde_openers_purge(de, &purge_queue);
/* NOP */
while
(!list_empty(&purge_queue))
...
rmmod
if (release)
release(inode, file) /* OOPS */
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