From: Rajkumar Manoharan <rmanohar@qti.qualcomm.com>
Date: Fri, 10 Oct 2014 12:08:27 +0000 (+0530)
Subject: ath10k: fix kernel panic while shutting down AP
X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=82d7aba71541a308bc19e869f7cf7423672dee37;p=GitHub%2FLineageOS%2FG12%2Fandroid_kernel_amlogic_linux-4.9.git

ath10k: fix kernel panic while shutting down AP

Based on GFP flag given to DMA coherent allocation, the behaviour of
dma_free_coherent is changed. This behavioural diffrence is noticeable
in ARM platform. If DMA memory is allocated with GFP_KERNEL, free
coherent can not be called inside spin lock. This is causing kernel
crash in ARM platforms. Fix this by changing GFP flag to atomic.

This is most likely a regression from commit 64badcb6d645 ("ath10k: workaround
fw beaconing bug").

Cc: Michal Kazior <michal.kazior@tieto.com>
Signed-off-by: Rajkumar Manoharan <rmanohar@qti.qualcomm.com>
Signed-off-by: Kalle Valo <kvalo@qca.qualcomm.com>
---

diff --git a/drivers/net/wireless/ath/ath10k/mac.c b/drivers/net/wireless/ath/ath10k/mac.c
index 11918575decc..b2bd80c4f72c 100644
--- a/drivers/net/wireless/ath/ath10k/mac.c
+++ b/drivers/net/wireless/ath/ath10k/mac.c
@@ -2839,7 +2839,7 @@ static int ath10k_add_interface(struct ieee80211_hw *hw,
 		arvif->beacon_buf = dma_zalloc_coherent(ar->dev,
 							IEEE80211_MAX_FRAME_LEN,
 							&arvif->beacon_paddr,
-							GFP_KERNEL);
+							GFP_ATOMIC);
 		if (!arvif->beacon_buf) {
 			ret = -ENOMEM;
 			ath10k_warn(ar, "failed to allocate beacon buffer: %d\n",