diff mbox series

net: xen-netback: hash.c: Use built-in RCU list checking

Message ID 20200115155553.13471-1-madhuparnabhowmik04@gmail.com
State Accepted
Delegated to: David Miller
Headers show
Series net: xen-netback: hash.c: Use built-in RCU list checking | expand

Commit Message

madhuparnabhowmik04@gmail.com Jan. 15, 2020, 3:55 p.m. UTC 
From: Madhuparna Bhowmik <madhuparnabhowmik04@gmail.com>

list_for_each_entry_rcu has built-in RCU and lock checking.
Pass cond argument to list_for_each_entry_rcu.

Signed-off-by: Madhuparna Bhowmik <madhuparnabhowmik04@gmail.com>
---
 drivers/net/xen-netback/hash.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

Comments

Wei Liu Jan. 15, 2020, 5:41 p.m. UTC | #1 
On Wed, Jan 15, 2020 at 09:25:53PM +0530, madhuparnabhowmik04@gmail.com wrote:
> From: Madhuparna Bhowmik <madhuparnabhowmik04@gmail.com>
> 
> list_for_each_entry_rcu has built-in RCU and lock checking.
> Pass cond argument to list_for_each_entry_rcu.
> 
> Signed-off-by: Madhuparna Bhowmik <madhuparnabhowmik04@gmail.com>

Acked-by: Wei Liu <wei.liu@kernel.org>
David Miller Jan. 17, 2020, 9:57 a.m. UTC | #2 
From: madhuparnabhowmik04@gmail.com
Date: Wed, 15 Jan 2020 21:25:53 +0530

> From: Madhuparna Bhowmik <madhuparnabhowmik04@gmail.com>
> 
> list_for_each_entry_rcu has built-in RCU and lock checking.
> Pass cond argument to list_for_each_entry_rcu.
> 
> Signed-off-by: Madhuparna Bhowmik <madhuparnabhowmik04@gmail.com>

Applied to net-next.
diff mbox series

Patch

diff --git a/drivers/net/xen-netback/hash.c b/drivers/net/xen-netback/hash.c
index 10d580c3dea3..6b7532f7c936 100644
--- a/drivers/net/xen-netback/hash.c
+++ b/drivers/net/xen-netback/hash.c
@@ -51,7 +51,8 @@  static void xenvif_add_hash(struct xenvif *vif, const u8 *tag,
 
 	found = false;
 	oldest = NULL;
-	list_for_each_entry_rcu(entry, &vif->hash.cache.list, link) {
+	list_for_each_entry_rcu(entry, &vif->hash.cache.list, link,
+				lockdep_is_held(&vif->hash.cache.lock)) {
 		/* Make sure we don't add duplicate entries */
 		if (entry->len == len &&
 		    memcmp(entry->tag, tag, len) == 0)
@@ -102,7 +103,8 @@  static void xenvif_flush_hash(struct xenvif *vif)
 
 	spin_lock_irqsave(&vif->hash.cache.lock, flags);
 
-	list_for_each_entry_rcu(entry, &vif->hash.cache.list, link) {
+	list_for_each_entry_rcu(entry, &vif->hash.cache.list, link,
+				lockdep_is_held(&vif->hash.cache.lock)) {
 		list_del_rcu(&entry->link);
 		vif->hash.cache.count--;
 		kfree_rcu(entry, rcu);