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From:   Bryan O'Donoghue <bryan.odonoghue@linaro.org>
To:     kvalo@codeaurora.org, linux-wireless@vger.kernel.org,
        wcn36xx@lists.infradead.org
Cc:     loic.poulain@linaro.org, benl@squareup.com,
        daniel.thompson@linaro.org, johannes@sipsolutions.net,
        bryan.odonoghue@linaro.org
Subject: [PATCH v2 5/5] wcn36xx: Put DXE block into reset before freeing memory
Date:   Tue, 19 Oct 2021 00:17:22 +0100
Message-Id: <20211018231722.873525-6-bryan.odonoghue@linaro.org>
In-Reply-To: <20211018231722.873525-1-bryan.odonoghue@linaro.org>
References: <20211018231722.873525-1-bryan.odonoghue@linaro.org>
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When deiniting the DXE hardware we should reset the block to ensure there
is no spurious DMA write transaction from the downstream WCNSS to upstream
MSM at a skbuff address we will have released.

Fixes: 8e84c2582169 ("wcn36xx: mac80211 driver for Qualcomm WCN3660/WCN3680 hardware")
Signed-off-by: Bryan O'Donoghue <bryan.odonoghue@linaro.org>
---
 drivers/net/wireless/ath/wcn36xx/dxe.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/net/wireless/ath/wcn36xx/dxe.c b/drivers/net/wireless/ath/wcn36xx/dxe.c
index d4f5746d9b10a..cf85b0cd11be4 100644
--- a/drivers/net/wireless/ath/wcn36xx/dxe.c
+++ b/drivers/net/wireless/ath/wcn36xx/dxe.c
@@ -1089,6 +1089,9 @@ void wcn36xx_dxe_deinit(struct wcn36xx *wcn)
 		wcn->tx_ack_skb = NULL;
 	}
 
+	/* Put the DXE block into reset before freeing memory */
+	wcn36xx_dxe_reset(wcn);
+
 	wcn36xx_dxe_ch_free_skbs(wcn, &wcn->dxe_rx_l_ch);
 	wcn36xx_dxe_ch_free_skbs(wcn, &wcn->dxe_rx_h_ch);
 
-- 
2.33.0