On 06.07.24 02:39, Jakub Kicinski wrote:
On Thu, 4 Jul 2024 19:47:56 +0200 Ronald Wahl wrote:--- a/drivers/net/ethernet/micrel/ks8851_spi.c +++ b/drivers/net/ethernet/micrel/ks8851_spi.c @@ -385,7 +385,7 @@ static netdev_tx_t ks8851_start_xmit_spi(struct sk_buff *skb, netif_dbg(ks, tx_queued, ks->netdev, "%s: skb %p, %d@%p\n", __func__, skb, skb->len, skb->data); - spin_lock(&ks->statelock); + spin_lock_bh(&ks->statelock); if (ks->queued_len + needed > ks->tx_space) { netif_stop_queue(dev); @@ -395,7 +395,7 @@ static netdev_tx_t ks8851_start_xmit_spi(struct sk_buff *skb, skb_queue_tail(&ks->txq, skb); } - spin_unlock(&ks->statelock); + spin_unlock_bh(&ks->statelock);this one probably can stay as spin_lock() since networking stack only calls xmit in BH context.
I already suspected this it was more a mental hint here. I will remove it.
But I see 2 other spin_lock(statelock) in the driver which I'm not as sure about. Any taking of this lock has to be _bh() unless you're sure the caller is already in BH.
The other two instances are not in BH context as far as I know but also do not interfere with BH. The one in ks8861_tx_work protects only variable assignments used only inside the driver and the one in ks8851_set_rx_mode also only does some driver local variable stuff and a schedule_work which as far as I know has nothing to do with BH because workqueues are running in process context. Am I wrong here? - ron ________________________________ Ce message, ainsi que tous les fichiers joints à ce message, peuvent contenir des informations sensibles et/ ou confidentielles ne devant pas être divulguées. Si vous n'êtes pas le destinataire de ce message (ou que vous recevez ce message par erreur), nous vous remercions de le notifier immédiatement à son expéditeur, et de détruire ce message. Toute copie, divulgation, modification, utilisation ou diffusion, non autorisée, directe ou indirecte, de tout ou partie de ce message, est strictement interdite. This e-mail, and any document attached hereby, may contain confidential and/or privileged information. If you are not the intended recipient (or have received this e-mail in error) please notify the sender immediately and destroy this e-mail. Any unauthorized, direct or indirect, copying, disclosure, distribution or other use of the material or parts thereof is strictly forbidden.
