Re: [net,PATCH v4 1/2] net: ks8851: Reinstate disabling of BHs around IRQ handler

[patchwork-bot+netdevbpf@kernel.org]

Hello:

This series was applied to netdev/net.git (main)
by Jakub Kicinski <kuba@kernel.org>:

On Thu, 16 Apr 2026 01:09:44 +0200 you wrote:
> If the driver executes ks8851_irq() AND a TX packet has been sent, then
> the driver enables TX queue via netif_wake_queue() which schedules TX
> softirq to queue packets for this device.
> 
> If CONFIG_PREEMPT_RT=y is set AND a packet has also been received by
> the MAC, then ks8851_rx_pkts() calls netdev_alloc_skb_ip_align() to
> allocate SKBs for the received packets. If netdev_alloc_skb_ip_align()
> is called with BH enabled, then local_bh_enable() at the end of
> netdev_alloc_skb_ip_align() will trigger the pending softirq processing,
> which may ultimately call the .xmit callback ks8851_start_xmit_par().
> The ks8851_start_xmit_par() will try to lock struct ks8851_net_par
> .lock spinlock, which is already locked by ks8851_irq() from which
> ks8851_start_xmit_par() was called. This leads to a deadlock, which
> is reported by the kernel, including a trace listed below.
> 
> [...]

Here is the summary with links:
  - [net,v4,1/2] net: ks8851: Reinstate disabling of BHs around IRQ handler
    https://git.kernel.org/netdev/net/c/5c9fcac3c872
  - [net,v4,2/2] net: ks8851: Avoid excess softirq scheduling
    https://git.kernel.org/netdev/net/c/22230e68b2cf

You are awesome, thank you!
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