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[4/6] wil6210: fix dma mapping error cleanup in __wil_tx_vring_tso

Message ID 1463426615-15523-5-git-send-email-qca_merez@qca.qualcomm.com (mailing list archive)
State Accepted
Commit e990f6c63840ac528c342ebbd1665c2f01fec5d3
Delegated to: Kalle Valo
Headers show

Commit Message

Maya Erez May 16, 2016, 7:23 p.m. UTC 
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>
---
 drivers/net/wireless/ath/wil6210/txrx.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
diff mbox

Patch

diff --git a/drivers/net/wireless/ath/wil6210/txrx.c b/drivers/net/wireless/ath/wil6210/txrx.c
index 483e063..f2f6a40 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;