[PATCH ath-next 1/2] wifi: ath11k: implement CE interrupt enable/disable for AHB

[Julius Bairaktaris]

ath11k_core_reset() calls ath11k_hif_ce_irq_disable() right before it
powers the target down, but ath11k_ahb_hif_ops_ipq8074 never set the
ce_irq_enable/ce_irq_disable pair, and ath11k_hif_ce_irq_disable() does
nothing when the op is NULL. On AHB the copy engine interrupts and their
tasklets therefore stay live across rproc_shutdown(), where the register
space they touch is no longer accessible.

Wire the ops up. The sequence is the one ath11k_ahb_stop() already runs,
factored into a helper and reused, so behaviour on the stop path is
unchanged. wcn6750 is not affected: it uses the pcic ops, which
implement the pair already.

Assisted-by: Claude:claude-opus-5
Signed-off-by: Julius Bairaktaris <julius@xxxxxxxxxxxxxx>
---
 drivers/net/wireless/ath/ath11k/ahb.c | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/drivers/net/wireless/ath/ath11k/ahb.c b/drivers/net/wireless/ath/ath11k/ahb.c
index f566d699d074..72da6919c277 100644
--- a/drivers/net/wireless/ath/ath11k/ahb.c
+++ b/drivers/net/wireless/ath/ath11k/ahb.c
@@ -391,12 +391,17 @@ static void ath11k_ahb_ext_irq_disable(struct ath11k_base *ab)
 	ath11k_ahb_sync_ext_irqs(ab);
 }
 
-static void ath11k_ahb_stop(struct ath11k_base *ab)
+static void ath11k_ahb_ce_irq_disable_sync(struct ath11k_base *ab)
 {
 	if (!test_bit(ATH11K_FLAG_CRASH_FLUSH, &ab->dev_flags))
 		ath11k_ahb_ce_irqs_disable(ab);
 	ath11k_ahb_sync_ce_irqs(ab);
 	ath11k_ahb_kill_tasklets(ab);
+}
+
+static void ath11k_ahb_stop(struct ath11k_base *ab)
+{
+	ath11k_ahb_ce_irq_disable_sync(ab);
 	timer_delete_sync(&ab->rx_replenish_retry);
 	ath11k_ce_cleanup_pipes(ab);
 }
@@ -773,6 +778,8 @@ static const struct ath11k_hif_ops ath11k_ahb_hif_ops_ipq8074 = {
 	.map_service_to_pipe = ath11k_ahb_map_service_to_pipe,
 	.power_down = ath11k_ahb_power_down,
 	.power_up = ath11k_ahb_power_up,
+	.ce_irq_enable = ath11k_ahb_ce_irqs_enable,
+	.ce_irq_disable = ath11k_ahb_ce_irq_disable_sync,
 };
 
 static const struct ath11k_hif_ops ath11k_ahb_hif_ops_wcn6750 = {
-- 
2.53.0