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authorMiquel Raynal <miquel.raynal@bootlin.com>2022-05-19 17:05:12 +0200
committerStefan Schmidt <stefan@datenfreihafen.org>2022-06-10 09:48:40 +0200
commita40612f399eabe23424acf5985643a35d4f2832e (patch)
tree87a0a6f4f6c9800150fed0739fca9f96c16c1f21 /net/mac802154
parent226730e1aa2844b6e5499a6fe6bea4db17a894a8 (diff)
net: mac802154: Introduce a helper to disable the queue
Sometimes calling the stop queue helper is not enough because it does not hold any lock. In order to be safe and avoid racy situations when trying to (soon) sync the Tx queue, for instance before sending an MLME frame, let's now introduce an helper which actually hold the necessary locks when doing so. Suggested-by: Alexander Aring <alex.aring@gmail.com> Signed-off-by: Miquel Raynal <miquel.raynal@bootlin.com> Acked-by: Alexander Aring <aahringo@redhat.com> Link: https://lore.kernel.org/r/20220519150516.443078-8-miquel.raynal@bootlin.com Signed-off-by: Stefan Schmidt <stefan@datenfreihafen.org>
Diffstat (limited to 'net/mac802154')
-rw-r--r--net/mac802154/ieee802154_i.h12
-rw-r--r--net/mac802154/util.c14
2 files changed, 26 insertions, 0 deletions
diff --git a/net/mac802154/ieee802154_i.h b/net/mac802154/ieee802154_i.h
index 0c7ff9e0b632..e34db1d49ef4 100644
--- a/net/mac802154/ieee802154_i.h
+++ b/net/mac802154/ieee802154_i.h
@@ -149,6 +149,18 @@ void ieee802154_hold_queue(struct ieee802154_local *local);
*/
void ieee802154_release_queue(struct ieee802154_local *local);
+/**
+ * ieee802154_disable_queue - disable ieee802154 queue
+ * @local: main mac object
+ *
+ * When trying to sync the Tx queue, we cannot just stop the queue
+ * (which is basically a bit being set without proper lock handling)
+ * because it would be racy. We actually need to call netif_tx_disable()
+ * instead, which is done by this helper. Restarting the queue can
+ * however still be done with a regular wake call.
+ */
+void ieee802154_disable_queue(struct ieee802154_local *local);
+
/* MIB callbacks */
void mac802154_dev_set_page_channel(struct net_device *dev, u8 page, u8 chan);
diff --git a/net/mac802154/util.c b/net/mac802154/util.c
index 0ed8b5bcbe8a..999534f64485 100644
--- a/net/mac802154/util.c
+++ b/net/mac802154/util.c
@@ -83,6 +83,20 @@ void ieee802154_release_queue(struct ieee802154_local *local)
spin_unlock_irqrestore(&local->phy->queue_lock, flags);
}
+void ieee802154_disable_queue(struct ieee802154_local *local)
+{
+ struct ieee802154_sub_if_data *sdata;
+
+ rcu_read_lock();
+ list_for_each_entry_rcu(sdata, &local->interfaces, list) {
+ if (!sdata->dev)
+ continue;
+
+ netif_tx_disable(sdata->dev);
+ }
+ rcu_read_unlock();
+}
+
enum hrtimer_restart ieee802154_xmit_ifs_timer(struct hrtimer *timer)
{
struct ieee802154_local *local =