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[4/8] wcn36xx: don't process 'valid' descriptors

Message ID 1420830952-9624-5-git-send-email-me@bobcopeland.com (mailing list archive)
State Accepted
Delegated to: Kalle Valo
Headers show

Commit Message

Bob Copeland Jan. 9, 2015, 7:15 p.m. UTC 
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>
---
 drivers/net/wireless/ath/wcn36xx/dxe.c |    2 ++
 1 file changed, 2 insertions(+)
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Patch

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);