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wil6210: limit fw error recovery attempts

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In case there is something fundamentally wrong with the firmware
(example: RF cable disconnected), FW will always crash immediately
after reset. This leads to infinite fw error recovery loop.

Count consecutive unsuccessful error recovery attempts in a short period
of time, and stop doing recovery after some reasonable count.
It is still possible to manually reset fw doing
interface down/up sequence.

Signed-off-by: Vladimir Kondratiev <qca_vkondrat@qca.qualcomm.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
This commit is contained in:
Vladimir Kondratiev 2014-05-27 14:45:45 +03:00 committed by John W. Linville
parent d87bac1b26
commit fc219eed07
2 changed files with 25 additions and 1 deletions
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22
drivers/net/wireless/ath/wil6210/main.c
View File

@ -161,12 +161,30 @@ static void wil_fw_error_worker(struct work_struct *work)
if (no_fw_recovery)
return;
/* increment @recovery_count if less then WIL6210_FW_RECOVERY_TO
* passed since last recovery attempt
*/
if (time_is_after_jiffies(wil->last_fw_recovery +
WIL6210_FW_RECOVERY_TO))
wil->recovery_count++;
else
wil->recovery_count = 1; /* fw was alive for a long time */
if (wil->recovery_count > WIL6210_FW_RECOVERY_RETRIES) {
wil_err(wil, "too many recovery attempts (%d), giving up\n",
wil->recovery_count);
return;
}
wil->last_fw_recovery = jiffies;
mutex_lock(&wil->mutex);
switch (wdev->iftype) {
case NL80211_IFTYPE_STATION:
case NL80211_IFTYPE_P2P_CLIENT:
case NL80211_IFTYPE_MONITOR:
wil_info(wil, "fw error recovery started...\n");
wil_info(wil, "fw error recovery started (try %d)...\n",
wil->recovery_count);
wil_reset(wil);
/* need to re-allocate Rx ring after reset */
@ -249,6 +267,8 @@ int wil_priv_init(struct wil6210_priv *wil)
return -EAGAIN;
}
wil->last_fw_recovery = jiffies;
return 0;
}

4
drivers/net/wireless/ath/wil6210/wil6210.h
View File

@ -40,6 +40,8 @@ static inline u32 WIL_GET_BITS(u32 x, int b0, int b1)
#define WIL6210_MAX_CID (8) /* HW limit */
#define WIL6210_NAPI_BUDGET (16) /* arbitrary */
#define WIL6210_ITR_TRSH (10000) /* arbitrary - about 15 IRQs/msec */
#define WIL6210_FW_RECOVERY_RETRIES (5) /* try to recover this many times */
#define WIL6210_FW_RECOVERY_TO msecs_to_jiffies(5000)
/* Hardware definitions begin */
@ -361,6 +363,8 @@ struct wil6210_priv {
u32 fw_version;
u32 hw_version;
u8 n_mids; /* number of additional MIDs as reported by FW */
int recovery_count; /* num of FW recovery attempts in a short time */
unsigned long last_fw_recovery; /* jiffies of last fw recovery */
/* profile */
u32 monitor_flags;
u32 secure_pcp; /* create secure PCP? */