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mwifiex: Trigger a card reset on reaching tx_timeout threshold

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tx_timeout doesn't always lead to a cmd_timeout. There are
occurrences where cmd_timeout never gets triggered for a long
time and we encounter a kernel crash. In this patch, we track
the consecutive timeouts (tx_timeout_cnt). When tx_timeout_cnt
exceeds the threshold, trigger a card reset thereby avoiding a
kernel crash.

Signed-off-by: Ashok Nagarajan <asnagarajan@chromium.org>
Signed-off-by: Paul Stewart <pstew@chromium.org>
Signed-off-by: Bing Zhao <bzhao@marvell.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
This commit is contained in:
Ashok Nagarajan 2013-03-08 10:58:45 -08:00 committed by John W. Linville
parent e6146c5cef
commit 8908c7d539
3 changed files with 19 additions and 3 deletions
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15
drivers/net/wireless/mwifiex/main.c
View File

@ -588,10 +588,19 @@ mwifiex_tx_timeout(struct net_device *dev)
{
struct mwifiex_private *priv = mwifiex_netdev_get_priv(dev);
dev_err(priv->adapter->dev, "%lu : Tx timeout, bss_type-num = %d-%d\n",
jiffies, priv->bss_type, priv->bss_num);
mwifiex_set_trans_start(dev);
priv->num_tx_timeout++;
priv->tx_timeout_cnt++;
dev_err(priv->adapter->dev,
"%lu : Tx timeout(#%d), bss_type-num = %d-%d\n",
jiffies, priv->tx_timeout_cnt, priv->bss_type, priv->bss_num);
mwifiex_set_trans_start(dev);
if (priv->tx_timeout_cnt > TX_TIMEOUT_THRESHOLD &&
priv->adapter->if_ops.card_reset) {
dev_err(priv->adapter->dev,
"tx_timeout_cnt exceeds threshold. Triggering card reset!\n");
priv->adapter->if_ops.card_reset(priv->adapter);
}
}
/*

5
drivers/net/wireless/mwifiex/main.h
View File

@ -130,6 +130,9 @@ enum {
#define MWIFIEX_USB_TYPE_DATA 0xBEADC0DE
#define MWIFIEX_USB_TYPE_EVENT 0xBEEFFACE
/* Threshold for tx_timeout_cnt before we trigger a card reset */
#define TX_TIMEOUT_THRESHOLD 6
struct mwifiex_dbg {
u32 num_cmd_host_to_card_failure;
u32 num_cmd_sleep_cfm_host_to_card_failure;
@ -394,6 +397,8 @@ struct mwifiex_private {
u8 curr_addr[ETH_ALEN];
u8 media_connected;
u32 num_tx_timeout;
/* track consecutive timeout */
u8 tx_timeout_cnt;
struct net_device *netdev;
struct net_device_stats stats;
u16 curr_pkt_filter;

2
drivers/net/wireless/mwifiex/txrx.c
View File

@ -169,6 +169,8 @@ int mwifiex_write_data_complete(struct mwifiex_adapter *adapter,
if (!status) {
priv->stats.tx_packets++;
priv->stats.tx_bytes += skb->len;
if (priv->tx_timeout_cnt)
priv->tx_timeout_cnt = 0;
} else {
priv->stats.tx_errors++;
}