From 7cae35199bee1cd661926f2d68ac46d07682fc54 Mon Sep 17 00:00:00 2001
From: Daniel Mack <daniel@zonque.org>
Date: Tue, 3 Apr 2018 18:51:52 +0200
Subject: [PATCH] wcn36xx: check for DMA mapping errors in wcn36xx_dxe_tx_frame()
Git-commit: 7cae35199bee1cd661926f2d68ac46d07682fc54
Patch-mainline: v4.18-rc1
References: FATE#326906
Bail out if the mapping fails. Even though this hasn't occured during
tests, this unlikely case should still be handled.
Signed-off-by: Daniel Mack <daniel@zonque.org>
Acked-by: Ramon Fried <rfried@codeaurora.org>
Signed-off-by: Kalle Valo <kvalo@codeaurora.org>
Acked-by: Takashi Iwai <tiwai@suse.de>
---
drivers/net/wireless/ath/wcn36xx/dxe.c | 5 +++++
1 file changed, 5 insertions(+)
diff --git a/drivers/net/wireless/ath/wcn36xx/dxe.c b/drivers/net/wireless/ath/wcn36xx/dxe.c
index 2c3b899a88fa..405d350f8708 100644
--- a/drivers/net/wireless/ath/wcn36xx/dxe.c
+++ b/drivers/net/wireless/ath/wcn36xx/dxe.c
@@ -705,6 +705,11 @@ int wcn36xx_dxe_tx_frame(struct wcn36xx *wcn,
ctl->skb->data,
ctl->skb->len,
DMA_TO_DEVICE);
+ if (dma_mapping_error(wcn->dev, desc->src_addr_l)) {
+ dev_err(wcn->dev, "unable to DMA map src_addr_l\n");
+ ret = -ENOMEM;
+ goto unlock;
+ }
desc->dst_addr_l = ch->dxe_wq;
desc->fr_len = ctl->skb->len;
--
2.19.2