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ath9k_htc: make ->sta_rc_update atomic for most calls 

commit 2fa4cb905605c863bf570027233af7afd8149ae4 upstream.

sta_rc_update() callback must be atomic, hence we can not take mutexes
or do other operations, which can sleep in ath9k_htc_sta_rc_update().

I think we can just return from ath9k_htc_sta_rc_update(), if it is
called without IEEE80211_RC_SUPP_RATES_CHANGED bit. That will help
with scheduling while atomic bug for most cases (except mesh and IBSS
modes).

For mesh and IBSS I do not see other solution like creating additional
workqueue, because sending firmware command require us to sleep, but
this can be done in additional patch.

Patch partially fixes bug:
https://bugzilla.redhat.com/show_bug.cgi?id=990955

Signed-off-by: Stanislaw Gruszka <sgruszka@redhat.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Stanislaw Gruszka 2014-01-28 09:14:48 +01:00 committed by Greg Kroah-Hartman
parent f8cdcac214
commit 6180be9f6b
1 changed files with 13 additions and 12 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

25
drivers/net/wireless/ath/ath9k/htc_drv_main.c
View File

@ -1331,21 +1331,22 @@ static void ath9k_htc_sta_rc_update(struct ieee80211_hw *hw,
struct ath_common *common = ath9k_hw_common(priv->ah);
struct ath9k_htc_target_rate trate;
if (!(changed & IEEE80211_RC_SUPP_RATES_CHANGED))
return;
mutex_lock(&priv->mutex);
ath9k_htc_ps_wakeup(priv);
if (changed & IEEE80211_RC_SUPP_RATES_CHANGED) {
memset(&trate, 0, sizeof(struct ath9k_htc_target_rate));
ath9k_htc_setup_rate(priv, sta, &trate);
if (!ath9k_htc_send_rate_cmd(priv, &trate))
ath_dbg(common, CONFIG,
"Supported rates for sta: %pM updated, rate caps: 0x%X\n",
sta->addr, be32_to_cpu(trate.capflags));
else
ath_dbg(common, CONFIG,
"Unable to update supported rates for sta: %pM\n",
sta->addr);
}
memset(&trate, 0, sizeof(struct ath9k_htc_target_rate));
ath9k_htc_setup_rate(priv, sta, &trate);
if (!ath9k_htc_send_rate_cmd(priv, &trate))
ath_dbg(common, CONFIG,
"Supported rates for sta: %pM updated, rate caps: 0x%X\n",
sta->addr, be32_to_cpu(trate.capflags));
else
ath_dbg(common, CONFIG,
"Unable to update supported rates for sta: %pM\n",
sta->addr);
ath9k_htc_ps_restore(priv);
mutex_unlock(&priv->mutex);