diff options
| author | Miquel Raynal <miquel.raynal@bootlin.com> | 2022-05-19 17:05:15 +0200 |
|---|---|---|
| committer | Stefan Schmidt <stefan@datenfreihafen.org> | 2022-06-10 09:48:41 +0200 |
| commit | 2b13db13af50a5dcdb944723c828915a50f0c3b2 (patch) | |
| tree | f32b59b62f2c3163e55f6c5a58864662148c245f /net/mac802154/tx.c | |
| parent | ddd9ee7cda122ac55571b8b11b51ef1e71918b63 (diff) | |
net: mac802154: Add a warning in the hot path
We should never start a transmission after the queue has been stopped.
But because it might work we don't kill the function here but rather
warn loudly the user that something is wrong.
Set a flag when the queue should remain stopped. Reset this flag when
the queue actually gets restarded. Just check this value to know if a
transmission is legitimate, warn if it is not.
Turn the flags variable into an unsigned long to allow the use of atomic
helpers on it.
Signed-off-by: Miquel Raynal <miquel.raynal@bootlin.com>
Acked-by: Alexander Aring <aahringo@redhat.com>
Link: https://lore.kernel.org/r/20220519150516.443078-11-miquel.raynal@bootlin.com
Signed-off-by: Stefan Schmidt <stefan@datenfreihafen.org>
Diffstat (limited to 'net/mac802154/tx.c')
| -rw-r--r-- | net/mac802154/tx.c | 16 |
1 files changed, 15 insertions, 1 deletions
diff --git a/net/mac802154/tx.c b/net/mac802154/tx.c index 4827391600f6..6188f42276e7 100644 --- a/net/mac802154/tx.c +++ b/net/mac802154/tx.c @@ -123,9 +123,13 @@ static int ieee802154_sync_queue(struct ieee802154_local *local) int ieee802154_sync_and_hold_queue(struct ieee802154_local *local) { + int ret; + ieee802154_hold_queue(local); + ret = ieee802154_sync_queue(local); + set_bit(WPAN_PHY_FLAG_STATE_QUEUE_STOPPED, &local->phy->flags); - return ieee802154_sync_queue(local); + return ret; } int ieee802154_mlme_op_pre(struct ieee802154_local *local) @@ -172,9 +176,19 @@ int ieee802154_mlme_tx_one(struct ieee802154_local *local, struct sk_buff *skb) return ret; } +static bool ieee802154_queue_is_stopped(struct ieee802154_local *local) +{ + return test_bit(WPAN_PHY_FLAG_STATE_QUEUE_STOPPED, &local->phy->flags); +} + static netdev_tx_t ieee802154_hot_tx(struct ieee802154_local *local, struct sk_buff *skb) { + /* Warn if the net interface tries to transmit frames while the + * ieee802154 core assumes the queue is stopped. + */ + WARN_ON_ONCE(ieee802154_queue_is_stopped(local)); + return ieee802154_tx(local, skb); } |