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Commit 34cbe27e authored by Eric Dumazet's avatar Eric Dumazet Committed by David S. Miller
Browse files

net: napi_hash_del() returns a boolean status 



napi_hash_del() will soon be used from both drivers (if they want)
or core networking stack.

Callers are responsibles to ensure an RCU grace period is respected
before freeing napi structure : napi_hash_del() can signal if
this RCU grace period is needed or not.

Signed-off-by: default avatarEric Dumazet <edumazet@google.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 6180d9de

include/linux/netdevice.h

+3 −2
Original line number Diff line number Diff line
@@ -474,9 +474,10 @@ void napi_hash_add(struct napi_struct *napi); 
 *	@napi: napi context

 *

 * Warning: caller must observe rcu grace period

 * before freeing memory containing @napi

 * before freeing memory containing @napi, if

 * this function returns true.

 */

void napi_hash_del(struct napi_struct *napi);

bool napi_hash_del(struct napi_struct *napi);



/**

 *	napi_disable - prevent NAPI from scheduling

net/core/dev.c

+7 −3
Original line number Diff line number Diff line
@@ -4760,14 +4760,18 @@ EXPORT_SYMBOL_GPL(napi_hash_add); 
/* Warning : caller is responsible to make sure rcu grace period

 * is respected before freeing memory containing @napi

 */

void napi_hash_del(struct napi_struct *napi)

bool napi_hash_del(struct napi_struct *napi)

{

	bool rcu_sync_needed = false;



	spin_lock(&napi_hash_lock);



	if (test_and_clear_bit(NAPI_STATE_HASHED, &napi->state))

	if (test_and_clear_bit(NAPI_STATE_HASHED, &napi->state)) {

		rcu_sync_needed = true;

		hlist_del_rcu(&napi->napi_hash_node);



	}

	spin_unlock(&napi_hash_lock);

	return rcu_sync_needed;

}

EXPORT_SYMBOL_GPL(napi_hash_del);