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ath10k: prevent pci tx/rx starvation

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In theory it was possible to starve the system if
a tx/rx handler could implicitly trigger more
tx/rx pci events.

Signed-off-by: Michal Kazior <michal.kazior@tieto.com>
Signed-off-by: Kalle Valo <kvalo@qca.qualcomm.com>
This commit is contained in:
Michal Kazior 2014-11-27 11:09:38 +01:00 committed by Kalle Valo
parent d84a512dca
commit 1cb86d47d4
1 changed files with 15 additions and 6 deletions
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21
drivers/net/wireless/ath/ath10k/pci.c
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@ -823,20 +823,24 @@ static void ath10k_pci_ce_send_done(struct ath10k_ce_pipe *ce_state)
struct ath10k *ar = ce_state->ar;
struct ath10k_pci *ar_pci = ath10k_pci_priv(ar);
struct ath10k_hif_cb *cb = &ar_pci->msg_callbacks_current;
void *transfer_context;
struct sk_buff_head list;
struct sk_buff *skb;
u32 ce_data;
unsigned int nbytes;
unsigned int transfer_id;
while (ath10k_ce_completed_send_next(ce_state, &transfer_context,
&ce_data, &nbytes,
&transfer_id) == 0) {
__skb_queue_head_init(&list);
while (ath10k_ce_completed_send_next(ce_state, (void **)&skb, &ce_data,
&nbytes, &transfer_id) == 0) {
/* no need to call tx completion for NULL pointers */
if (transfer_context == NULL)
if (skb == NULL)
continue;
cb->tx_completion(ar, transfer_context);
__skb_queue_tail(&list, skb);
}
while ((skb = __skb_dequeue(&list)))
cb->tx_completion(ar, skb);
}
/* Called by lower (CE) layer when data is received from the Target. */
@ -847,12 +851,14 @@ static void ath10k_pci_ce_recv_data(struct ath10k_ce_pipe *ce_state)
struct ath10k_pci_pipe *pipe_info = &ar_pci->pipe_info[ce_state->id];
struct ath10k_hif_cb *cb = &ar_pci->msg_callbacks_current;
struct sk_buff *skb;
struct sk_buff_head list;
void *transfer_context;
u32 ce_data;
unsigned int nbytes, max_nbytes;
unsigned int transfer_id;
unsigned int flags;
__skb_queue_head_init(&list);
while (ath10k_ce_completed_recv_next(ce_state, &transfer_context,
&ce_data, &nbytes, &transfer_id,
&flags) == 0) {
@ -869,7 +875,10 @@ static void ath10k_pci_ce_recv_data(struct ath10k_ce_pipe *ce_state)
}
skb_put(skb, nbytes);
__skb_queue_tail(&list, skb);
}
while ((skb = __skb_dequeue(&list))) {
ath10k_dbg(ar, ATH10K_DBG_PCI, "pci rx ce pipe %d len %d\n",
ce_state->id, skb->len);
ath10k_dbg_dump(ar, ATH10K_DBG_PCI_DUMP, NULL, "pci rx: ",