Re: [PATCH 5.10.y] net: Drop the lock in skb_may_tx_timestamp()
From: Sasha Levin
Date: Mon Jul 13 2026 - 16:35:29 EST
> commit 983512f3a87fd8dc4c94dfa6b596b6e57df5aad7 upstream.
>
> skb_may_tx_timestamp() may acquire sock::sk_callback_lock. The lock must
> not be taken in IRQ context, only softirq is okay. A few drivers receive
> the timestamp via a dedicated interrupt and complete the TX timestamp
> from that handler. This will lead to a deadlock if the lock is already
> write-locked on the same CPU.
Queued for 5.10.y, thanks.
--
Thanks,
Sasha