From eb2428fb1a21e7c813987118b0296135ddec0f24 Mon Sep 17 00:00:00 2001 From: Shengzhen Li Date: Fri, 18 Nov 2016 19:30:24 +0530 Subject: [PATCH] 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 Signed-off-by: Shengzhen Li Tested-by: Xinming Hu Signed-off-by: Amitkumar Karwar Reviewed-by: Brian Norris Signed-off-by: Kalle Valo --- drivers/net/wireless/marvell/mwifiex/cmdevt.c | 5 +++-- drivers/net/wireless/marvell/mwifiex/init.c | 1 + drivers/net/wireless/marvell/mwifiex/main.h | 1 + drivers/net/wireless/marvell/mwifiex/pcie.c | 5 +++++ 4 files changed, 10 insertions(+), 2 deletions(-) diff --git a/drivers/net/wireless/marvell/mwifiex/cmdevt.c b/drivers/net/wireless/marvell/mwifiex/cmdevt.c index 53477280f39c..25a7475702f7 100644 --- a/drivers/net/wireless/marvell/mwifiex/cmdevt.c +++ b/drivers/net/wireless/marvell/mwifiex/cmdevt.c @@ -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" : ""); } diff --git a/drivers/net/wireless/marvell/mwifiex/init.c b/drivers/net/wireless/marvell/mwifiex/init.c index 82839d9f079f..b36cb3fef358 100644 --- a/drivers/net/wireless/marvell/mwifiex/init.c +++ b/drivers/net/wireless/marvell/mwifiex/init.c @@ -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; diff --git a/drivers/net/wireless/marvell/mwifiex/main.h b/drivers/net/wireless/marvell/mwifiex/main.h index ae5afe5829ea..904a2edefc06 100644 --- a/drivers/net/wireless/marvell/mwifiex/main.h +++ b/drivers/net/wireless/marvell/mwifiex/main.h @@ -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; diff --git a/drivers/net/wireless/marvell/mwifiex/pcie.c b/drivers/net/wireless/marvell/mwifiex/pcie.c index 2ab1d179f16c..cfb45ef9f85f 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 -- 2.20.1