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mwifiex: check tx_hw_pending before downloading sleep confirm

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We may get SLEEP event from firmware even if TXDone interrupt
for last Tx packet is still pending. In this case, we may
end up accessing PCIe memory for handling TXDone after power
save handshake is completed. This causes kernel crash with
external abort.

This patch will only allow downloading sleep confirm
when no tx done interrupt is pending in the hardware.

Signed-off-by: Cathy Luo <cluo@marvell.com>
Signed-off-by: Shengzhen Li <szli@marvell.com>
Tested-by: Xinming Hu <huxm@marvell.com>
Signed-off-by: Amitkumar Karwar <akarwar@marvell.com>
Reviewed-by: Brian Norris <briannorris@chromium.org>
Signed-off-by: Kalle Valo <kvalo@codeaurora.org>
This commit is contained in:
Shengzhen Li 2016-11-18 19:30:24 +05:30 committed by Kalle Valo
parent 853402a008
commit eb2428fb1a
4 changed files with 10 additions and 2 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

5
drivers/net/wireless/marvell/mwifiex/cmdevt.c
View file

@ -1118,13 +1118,14 @@ mwifiex_cancel_pending_ioctl(struct mwifiex_adapter *adapter)
void
mwifiex_check_ps_cond(struct mwifiex_adapter *adapter)
{
if (!adapter->cmd_sent &&
if (!adapter->cmd_sent && !atomic_read(&adapter->tx_hw_pending) &&
!adapter->curr_cmd && !IS_CARD_RX_RCVD(adapter))
mwifiex_dnld_sleep_confirm_cmd(adapter);
else
mwifiex_dbg(adapter, CMD,
"cmd: Delay Sleep Confirm (%s%s%s)\n",
"cmd: Delay Sleep Confirm (%s%s%s%s)\n",
(adapter->cmd_sent) ? "D" : "",
atomic_read(&adapter->tx_hw_pending) ? "T" : "",
(adapter->curr_cmd) ? "C" : "",
(IS_CARD_RX_RCVD(adapter)) ? "R" : "");
}

1
drivers/net/wireless/marvell/mwifiex/init.c
View file

@ -270,6 +270,7 @@ static void mwifiex_init_adapter(struct mwifiex_adapter *adapter)
adapter->adhoc_11n_enabled = false;
mwifiex_wmm_init(adapter);
atomic_set(&adapter->tx_hw_pending, 0);
sleep_cfm_buf = (struct mwifiex_opt_sleep_confirm *)
adapter->sleep_cfm->data;

1
drivers/net/wireless/marvell/mwifiex/main.h
View file

@ -857,6 +857,7 @@ struct mwifiex_adapter {
atomic_t rx_pending;
atomic_t tx_pending;
atomic_t cmd_pending;
atomic_t tx_hw_pending;
struct workqueue_struct *workqueue;
struct work_struct main_work;
struct workqueue_struct *rx_workqueue;

5
drivers/net/wireless/marvell/mwifiex/pcie.c
View file

@ -516,6 +516,7 @@ static int mwifiex_pcie_disable_host_int(struct mwifiex_adapter *adapter)
}
}
atomic_set(&adapter->tx_hw_pending, 0);
return 0;
}
@ -715,6 +716,7 @@ static void mwifiex_cleanup_txq_ring(struct mwifiex_adapter *adapter)
card->tx_buf_list[i] = NULL;
}
atomic_set(&adapter->tx_hw_pending, 0);
return;
}
@ -1152,6 +1154,7 @@ static int mwifiex_pcie_send_data_complete(struct mwifiex_adapter *adapter)
-1);
else
mwifiex_write_data_complete(adapter, skb, 0, 0);
atomic_dec(&adapter->tx_hw_pending);
}
card->tx_buf_list[wrdoneidx] = NULL;
@ -1244,6 +1247,7 @@ mwifiex_pcie_send_data(struct mwifiex_adapter *adapter, struct sk_buff *skb,
wrindx = (card->txbd_wrptr & reg->tx_mask) >> reg->tx_start_ptr;
buf_pa = MWIFIEX_SKB_DMA_ADDR(skb);
card->tx_buf_list[wrindx] = skb;
atomic_inc(&adapter->tx_hw_pending);
if (reg->pfu_enabled) {
desc2 = card->txbd_ring[wrindx];
@ -1321,6 +1325,7 @@ mwifiex_pcie_send_data(struct mwifiex_adapter *adapter, struct sk_buff *skb,
done_unmap:
mwifiex_unmap_pci_memory(adapter, skb, PCI_DMA_TODEVICE);
card->tx_buf_list[wrindx] = NULL;
atomic_dec(&adapter->tx_hw_pending);
if (reg->pfu_enabled)
memset(desc2, 0, sizeof(*desc2));
else