The DMA engine will reset the valid bit after a descriptor is
complete; any with the valid bit still set may still be in
use by the hardware, so check that before freeing the descriptor.
Signed-off-by: Bob Copeland <me@xxxxxxxxxxxxxxx>
---
drivers/net/wireless/ath/wcn36xx/dxe.c | 2 ++
1 file changed, 2 insertions(+)
diff --git a/drivers/net/wireless/ath/wcn36xx/dxe.c b/drivers/net/wireless/ath/wcn36xx/dxe.c
index 73f12f1..3d6bc9b 100644
--- a/drivers/net/wireless/ath/wcn36xx/dxe.c
+++ b/drivers/net/wireless/ath/wcn36xx/dxe.c
@@ -354,6 +354,8 @@ static void reap_tx_dxes(struct wcn36xx *wcn, struct wcn36xx_dxe_ch *ch)
* and while-do will not make any cycles.
*/
do {
+ if (ctl->desc->ctrl & WCN36XX_DXE_CTRL_VALID_MASK)
+ break;
if (ctl->skb) {
dma_unmap_single(NULL, ctl->desc->src_addr_l,
ctl->skb->len, DMA_TO_DEVICE);
--
1.7.10.4
--
To unsubscribe from this list: send the line "unsubscribe linux-wireless" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
