[PATCH 1/3] wcn36xx: check for DMA mapping errors in wcn36xx_dxe_tx_frame()

[Daniel Mack]

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 at zonque.org>
---
 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 6e9a3583c447..e8ad8f989ccd 100644
--- a/drivers/net/wireless/ath/wcn36xx/dxe.c
+++ b/drivers/net/wireless/ath/wcn36xx/dxe.c
@@ -707,6 +707,11 @@ 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;
-- 
2.14.3