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ath10k: fix napi_poll budget overflow

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In napi_poll, the budget number is used to control the amount of packets
we should handle per poll to balance the resource in the system.

In the list of the amsdu packets reception, we check if there is budget
count left and handle the complete list of the packets, that it will have
chances the very last list will over the budget leftover.

So adding one more parameter - budget_left, this would help while
traversing the list to avoid handling more than the budget given.

Reported-by: Andrey Ryabinin <aryabinin@virtuozzo.com>
Fix-suggested-by: Igor Mitsyanko <igor.mitsyanko.os@quantenna.com>
Link: https://lkml.kernel.org/r/26670dce-4dd2-f8e4-0e14-90d74257e739@virtuozzo.com
Signed-off-by: Ryan Hsu <ryanhsu@qti.qualcomm.com>
Signed-off-by: Kalle Valo <kvalo@qca.qualcomm.com>
This commit is contained in:
Ryan Hsu 2017-08-22 14:44:02 -07:00 committed by Kalle Valo
parent 76b07b30c4
commit c9353bf483
1 changed files with 11 additions and 6 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

17
drivers/net/wireless/ath/ath10k/htt_rx.c
View File

@ -1745,7 +1745,8 @@ static void ath10k_htt_rx_delba(struct ath10k *ar, struct htt_resp *resp)
}
static int ath10k_htt_rx_extract_amsdu(struct sk_buff_head *list,
struct sk_buff_head *amsdu)
struct sk_buff_head *amsdu,
int budget_left)
{
struct sk_buff *msdu;
struct htt_rx_desc *rxd;
@ -1756,8 +1757,9 @@ static int ath10k_htt_rx_extract_amsdu(struct sk_buff_head *list,
if (WARN_ON(!skb_queue_empty(amsdu)))
return -EINVAL;
while ((msdu = __skb_dequeue(list))) {
while ((msdu = __skb_dequeue(list)) && budget_left) {
__skb_queue_tail(amsdu, msdu);
budget_left--;
rxd = (void *)msdu->data - sizeof(*rxd);
if (rxd->msdu_end.common.info0 &
@ -1848,7 +1850,8 @@ static int ath10k_htt_rx_h_rx_offload(struct ath10k *ar,
return num_msdu;
}
static int ath10k_htt_rx_in_ord_ind(struct ath10k *ar, struct sk_buff *skb)
static int ath10k_htt_rx_in_ord_ind(struct ath10k *ar, struct sk_buff *skb,
int budget_left)
{
struct ath10k_htt *htt = &ar->htt;
struct htt_resp *resp = (void *)skb->data;
@ -1905,9 +1908,9 @@ static int ath10k_htt_rx_in_ord_ind(struct ath10k *ar, struct sk_buff *skb)
if (offload)
num_msdus = ath10k_htt_rx_h_rx_offload(ar, &list);
while (!skb_queue_empty(&list)) {
while (!skb_queue_empty(&list) && budget_left) {
__skb_queue_head_init(&amsdu);
ret = ath10k_htt_rx_extract_amsdu(&list, &amsdu);
ret = ath10k_htt_rx_extract_amsdu(&list, &amsdu, budget_left);
switch (ret) {
case 0:
/* Note: The in-order indication may report interleaved
@ -1917,6 +1920,7 @@ static int ath10k_htt_rx_in_ord_ind(struct ath10k *ar, struct sk_buff *skb)
* should still give an idea about rx rate to the user.
*/
num_msdus += skb_queue_len(&amsdu);
budget_left -= skb_queue_len(&amsdu);
ath10k_htt_rx_h_ppdu(ar, &amsdu, status, vdev_id);
ath10k_htt_rx_h_filter(ar, &amsdu, status);
ath10k_htt_rx_h_mpdu(ar, &amsdu, status);
@ -2559,7 +2563,8 @@ int ath10k_htt_txrx_compl_task(struct ath10k *ar, int budget)
}
spin_lock_bh(&htt->rx_ring.lock);
num_rx_msdus = ath10k_htt_rx_in_ord_ind(ar, skb);
num_rx_msdus = ath10k_htt_rx_in_ord_ind(ar, skb,
(budget - quota));
spin_unlock_bh(&htt->rx_ring.lock);
if (num_rx_msdus < 0) {
resched_napi = true;