mwifiex: check tx_hw_pending before downloading sleep confirm
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>
diff --git a/drivers/net/wireless/marvell/mwifiex/pcie.c b/drivers/net/wireless/marvell/mwifiex/pcie.c
index 2ab1d17..cfb45ef 100644
--- a/drivers/net/wireless/marvell/mwifiex/pcie.c
+++ b/drivers/net/wireless/marvell/mwifiex/pcie.c
@@ -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
