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| author | Michal Kazior <michal.kazior@tieto.com> | 2014-07-21 21:03:10 +0300 |
|---|---|---|
| committer | Kalle Valo <kvalo@qca.qualcomm.com> | 2014-07-22 21:31:08 +0300 |
| commit | c29a380e4a8157f8bf6a91c216a77439a293c93d (patch) | |
| tree | 65a68c69c59b804f56ab0af4f1179d8ea3d4abd5 | |
| parent | c21c64d145e64d92a6c8f8e13c9b6b5b711832eb (diff) | |
| download | op-kernel-dev-c29a380e4a8157f8bf6a91c216a77439a293c93d.zip op-kernel-dev-c29a380e4a8157f8bf6a91c216a77439a293c93d.tar.gz | |
ath10k: prevent endless pci rx loop
It was possible to enter an endless loop while
processing a single pci copy engine pipe. This
could effectively render ath10k incapable of
responding to any requests.
An example case when this could happen is when
firmware generates a lot of events, e.g. spectral
scan phyerr via WMI.
Reported-by: Janusz Dziedzic <janusz.dziedzic@tieto.com>
Signed-off-by: Michal Kazior <michal.kazior@tieto.com>
Signed-off-by: Kalle Valo <kvalo@qca.qualcomm.com>
| -rw-r--r-- | drivers/net/wireless/ath/ath10k/pci.c | 17 |
1 files changed, 9 insertions, 8 deletions
diff --git a/drivers/net/wireless/ath/ath10k/pci.c b/drivers/net/wireless/ath/ath10k/pci.c index 06840d1..0ffff20 100644 --- a/drivers/net/wireless/ath/ath10k/pci.c +++ b/drivers/net/wireless/ath/ath10k/pci.c @@ -726,18 +726,12 @@ static void ath10k_pci_ce_recv_data(struct ath10k_ce_pipe *ce_state) unsigned int nbytes, max_nbytes; unsigned int transfer_id; unsigned int flags; - int err; + int err, num_replenish = 0; while (ath10k_ce_completed_recv_next(ce_state, &transfer_context, &ce_data, &nbytes, &transfer_id, &flags) == 0) { - err = ath10k_pci_post_rx_pipe(pipe_info, 1); - if (unlikely(err)) { - /* FIXME: retry */ - ath10k_warn("failed to replenish CE rx ring %d: %d\n", - pipe_info->pipe_num, err); - } - + num_replenish++; skb = transfer_context; max_nbytes = skb->len + skb_tailroom(skb); dma_unmap_single(ar->dev, ATH10K_SKB_CB(skb)->paddr, @@ -753,6 +747,13 @@ static void ath10k_pci_ce_recv_data(struct ath10k_ce_pipe *ce_state) skb_put(skb, nbytes); cb->rx_completion(ar, skb, pipe_info->pipe_num); } + + err = ath10k_pci_post_rx_pipe(pipe_info, num_replenish); + if (unlikely(err)) { + /* FIXME: retry */ + ath10k_warn("failed to replenish CE rx ring %d (%d bufs): %d\n", + pipe_info->pipe_num, num_replenish, err); + } } static int ath10k_pci_hif_tx_sg(struct ath10k *ar, u8 pipe_id, |
