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wcn36xx: don't process 'valid' descriptors

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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>
This commit is contained in:
Bob Copeland 2015-01-09 14:15:48 -05:00 committed by Kalle Valo
parent 232ddcd80f
commit bfa6696b39
1 changed files with 2 additions and 0 deletions
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2
drivers/net/wireless/ath/wcn36xx/dxe.c
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@ -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);