mwifiex: Trigger a card reset on reaching tx_timeout threshold
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>
diff --git a/drivers/net/wireless/mwifiex/main.h b/drivers/net/wireless/mwifiex/main.h
index 560cf73..9206575 100644
--- a/drivers/net/wireless/mwifiex/main.h
+++ b/drivers/net/wireless/mwifiex/main.h
@@ -130,6 +130,9 @@
#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 @@
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;