From: Maya Erez <qca_merez@qca.qualcomm.com>
Date: Mon, 16 May 2016 19:23:33 +0000 (+0300)
Subject: wil6210: fix dma mapping error cleanup in __wil_tx_vring_tso
X-Git-Tag: v4.8-rc1~140^2~279^2^2~23
X-Git-Url: https://git.kernel.dk/?a=commitdiff_plain;h=a1526f7eafa434f756579e2bc784b7605f96bf3e;p=linux-2.6-block.git

wil6210: fix dma mapping error cleanup in __wil_tx_vring_tso

In case we fail to map one of the TSO SKB fragments, we need to
clear all the mapped descriptors, from swhead to swhead+descs_used-1.

Change the desc index calculation to
i = (swhead + descs_used - 1) % vring->size;
to prevent unmpping of (swhead + descs_used) descriptor that wasn't
mapped.

Signed-off-by: Maya Erez <qca_merez@qca.qualcomm.com>
Signed-off-by: Kalle Valo <kvalo@qca.qualcomm.com>
---

diff --git a/drivers/net/wireless/ath/wil6210/txrx.c b/drivers/net/wireless/ath/wil6210/txrx.c
index 483e0634041c..f2f6a404d3d1 100644
--- a/drivers/net/wireless/ath/wil6210/txrx.c
+++ b/drivers/net/wireless/ath/wil6210/txrx.c
@@ -1594,7 +1594,7 @@ mem_error:
 	while (descs_used > 0) {
 		struct wil_ctx *ctx;
 
-		i = (swhead + descs_used) % vring->size;
+		i = (swhead + descs_used - 1) % vring->size;
 		d = (struct vring_tx_desc *)&vring->va[i].tx;
 		_desc = &vring->va[i].tx;
 		*d = *_desc;