proto_unregister sleeps while atomic

[Daniele Orlandi <daniele@orlandi.com>]

I'm looking at proto_unregister() in linux-2.6.13:

Il calls kmem_cache_destroy() while holding proto_list_lock:

void proto_unregister(struct proto *prot)
{
        write_lock(&proto_list_lock);

        if (prot->slab != NULL) {
                kmem_cache_destroy(prot->slab);


However, kmem_cache_destroy() may sleep:

int kmem_cache_destroy (kmem_cache_t * cachep)
{
         int i;
 
         if (!cachep || in_interrupt())
                BUG();
 
         /* Don't let CPUs to come and go */
         lock_cpu_hotplug();

        /* Find the cache in the chain of caches. */
        down(&cache_chain_sem);
        ^^^^^^^^^^^^^^^^^^^^^^^

Am I seeing it right?

Bye,

-- 
  Daniele Orlandi
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