[lkml]   [2019]   [Dec]   [16]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
Messages in this thread
Patch in this message
Subject[PATCH 02/55] staging: wfx: fix case of lack of tx_retry_policies
From: Jérôme Pouiller <>

In some rare cases, driver may not have any available tx_retry_policies.
In this case, the driver asks to mac80211 to stop sending data. However,
it seems that a race is possible and a few frames can be sent to the
driver. In this case, driver can't wait for free tx_retry_policies since
wfx_tx() must be atomic. So, this patch fix this case by sending these
frames with the special policy number 15.

The firmware normally use policy 15 to send internal frames (PS-poll,
beacons, etc...). So, it is not a so bad fallback.

Signed-off-by: Jérôme Pouiller <>
drivers/staging/wfx/data_tx.c | 7 +++++--
1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/drivers/staging/wfx/data_tx.c b/drivers/staging/wfx/data_tx.c
index 02f001dab62b..df3aca03b50b 100644
--- a/drivers/staging/wfx/data_tx.c
+++ b/drivers/staging/wfx/data_tx.c
@@ -16,7 +16,7 @@
#include "traces.h"
#include "hif_tx_mib.h"

#define WFX_LINK_ID_GC_TIMEOUT ((unsigned long)(10 * HZ))

@@ -202,6 +202,8 @@ static void wfx_tx_policy_put(struct wfx_vif *wvif, int idx)
int usage, locked;
struct tx_policy_cache *cache = &wvif->tx_policy_cache;

+ if (idx == WFX_INVALID_RATE_ID)
+ return;
locked = list_empty(&cache->free);
usage = wfx_tx_policy_release(cache, &cache->cache[idx]);
@@ -549,7 +551,8 @@ static u8 wfx_tx_get_rate_id(struct wfx_vif *wvif,

rate_id = wfx_tx_policy_get(wvif,
tx_info->driver_rates, &tx_policy_renew);
- WARN(rate_id == WFX_INVALID_RATE_ID, "unable to get a valid Tx policy");
+ if (rate_id == WFX_INVALID_RATE_ID)
+ dev_warn(wvif->wdev->dev, "unable to get a valid Tx policy");

if (tx_policy_renew) {
/* FIXME: It's not so optimal to stop TX queues every now and
 \ /
  Last update: 2019-12-16 18:04    [W:0.296 / U:4.932 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site