wcn36xx: don't process 'valid' descriptors

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@bobcopeland.com>
Signed-off-by: Kalle Valo <kvalo@codeaurora.org>

diff --git a/drivers/net/wireless/ath/wcn36xx/dxe.c b/drivers/net/wireless/ath/wcn36xx/dxe.c
index 73f12f196f14ec6ee14368dee20673f67b8045a3..3d6bc9b8717677d359767f2a5e258e2c7c8ec4f2 100644 (file)
--- 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);