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From: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Date: Thu, 28 Jan 2021 16:33:45 +0100
Subject: [PATCH 16/19] ath9k: Use tasklet_disable_in_atomic().
Origin: https://www.kernel.org/pub/linux/kernel/projects/rt/5.10/older/patches-5.10.17-rt32.tar.xz
All caller of ath9k_beacon_ensure_primary_slot() are preemptible /
acquire a mutex except for the callchain:
spin_lock_bh(&sc->sc_pcu_lock);
ath_complete_reset()
-> ath9k_calculate_summary_state()
-> ath9k_beacon_ensure_primary_slot()
which is always invoked in atomic context due to the spin lock.
I have no idea how to get around it so convert it to
tasklet_disable_in_atomic().
Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
---
drivers/net/wireless/ath/ath9k/beacon.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
--- a/drivers/net/wireless/ath/ath9k/beacon.c
+++ b/drivers/net/wireless/ath/ath9k/beacon.c
@@ -251,7 +251,7 @@ void ath9k_beacon_ensure_primary_slot(st
int first_slot = ATH_BCBUF;
int slot;
- tasklet_disable(&sc->bcon_tasklet);
+ tasklet_disable_in_atomic(&sc->bcon_tasklet);
/* Find first taken slot. */
for (slot = 0; slot < ATH_BCBUF; slot++) {
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