[PATCH v6 03/13] wifi: ath11k: fix a possible dead lock caused by ab->base_lock

[Jeff Johnson]

On 9/20/2023 1:23 AM, Wen Gong wrote:
> From: Baochen Qiang <quic_bqiang at quicinc.com>
> 
> spin_lock/spin_unlock are used in ath11k_reg_chan_list_event to
> acquire/release ab->base_lock, for now this is safe because that

Kalle, can you s/, for/. For/ when you pull into pending?

> function is only called in soft IRQ context.
> 
> But ath11k_reg_chan_list_event() will be called from process
> context in an upcoming patch, and this can result in a deadlock if
> ab->base_lock is acquired in process context and then soft IRQ occurs
> on the same CPU and tries to acquire that lock.
> 
> Fix it by using spin_lock_bh and spin_unlock_bh instead.
> 
> Tested-on: WCN6855 hw2.0 PCI WLAN.HSP.1.1-03125-QCAHSPSWPL_V1_V2_SILICONZ_LITE-3.6510.23
> 
> Fixes: 69a0fcf8a9f2 ("ath11k: Avoid reg rules update during firmware recovery")
> Signed-off-by: Baochen Qiang <quic_bqiang at quicinc.com>
> Signed-off-by: Wen Gong <quic_wgong at quicinc.com>
Acked-by: Jeff Johnson <quic_jjohnson at quicinc.com>