wifi: ath11k: fix a possible dead lock caused by ab->base_lock

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
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: 69a0fcf ("ath11k: Avoid reg rules update during firmware recovery")
Signed-off-by: Baochen Qiang <quic_bqiang@quicinc.com>
Signed-off-by: Wen Gong <quic_wgong@quicinc.com>
Acked-by: Jeff Johnson <quic_jjohnson@quicinc.com>
Signed-off-by: Kalle Valo <quic_kvalo@quicinc.com>
Link: https://msgid.link/20231218085844.2658-4-quic_bqiang@quicinc.com

drivers/net/wireless/ath/ath11k/reg.c

@@ -852,13 +852,13 @@ int ath11k_reg_handle_chan_list(struct ath11k_base *ab,
 	/* Avoid default reg rule updates sent during FW recovery if
 	 * it is already available
 	 */
-	spin_lock(&ab->base_lock);
+	spin_lock_bh(&ab->base_lock);
 	if (test_bit(ATH11K_FLAG_RECOVERY, &ab->dev_flags) &&
 	    ab->default_regd[pdev_idx]) {
-		spin_unlock(&ab->base_lock);
+		spin_unlock_bh(&ab->base_lock);
 		goto retfail;
 	}
-	spin_unlock(&ab->base_lock);
+	spin_unlock_bh(&ab->base_lock);
 
 	if (pdev_idx >= ab->num_radios) {
 		/* Process the event for phy0 only if single_pdev_only
@@ -911,7 +911,7 @@ int ath11k_reg_handle_chan_list(struct ath11k_base *ab,
 		ab->reg_info_store[pdev_idx] = *reg_info;
 	}
 
-	spin_lock(&ab->base_lock);
+	spin_lock_bh(&ab->base_lock);
 	if (ab->default_regd[pdev_idx]) {
 		/* The initial rules from FW after WMI Init is to build
 		 * the default regd. From then on, any rules updated for
@@ -931,7 +931,7 @@ int ath11k_reg_handle_chan_list(struct ath11k_base *ab,
 		ab->default_regd[pdev_idx] = regd;
 	}
 	ab->dfs_region = reg_info->dfs_region;
-	spin_unlock(&ab->base_lock);
+	spin_unlock_bh(&ab->base_lock);
 
 	return 0;