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authorLarry Finger <Larry.Finger@lwfinger.net>2012-03-02 15:23:36 -0600
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2012-04-02 09:27:09 -0700
commitdebc5a0ed2f7cc40c31ea56f070b1af6920f6c53 (patch)
tree79866439ffd7897af1e5365fac5f6c4353553e42
parent8400bf923e7fd057abc6dc2ab6e00e481b26a793 (diff)
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rtlwifi: rtl8192c: Prevent sleeping from invalid context in rtl8192cu
commit ebecdcc12fed5d3c81853dea61a0a78a5aefab52 upstream. When driver rtl8192cu is used with the debug level set to 3 or greater, the result is "sleeping function called from invalid context" due to an rcu_read_lock() call in the DM refresh routine in driver rtl8192c. This lock is not necessary as the USB driver does not use the struct being protected, thus the lock is set only when a PCI interface is active. This bug is reported in https://bugzilla.kernel.org/show_bug.cgi?id=42775. Reported-by: Ronald Wahl <ronald.wahl@raritan.com> Tested-by: Ronald Wahl <ronald.wahl@raritan.com> Signed-off-by: Larry Finger <Larry.Finger@lwfinger.net> Cc: Ronald Wahl <ronald.wahl@raritan.com> Signed-off-by: John W. Linville <linville@tuxdriver.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
-rw-r--r--drivers/net/wireless/rtlwifi/rtl8192c/dm_common.c11
1 files changed, 8 insertions, 3 deletions
diff --git a/drivers/net/wireless/rtlwifi/rtl8192c/dm_common.c b/drivers/net/wireless/rtlwifi/rtl8192c/dm_common.c
index 9718382..27f2f5d 100644
--- a/drivers/net/wireless/rtlwifi/rtl8192c/dm_common.c
+++ b/drivers/net/wireless/rtlwifi/rtl8192c/dm_common.c
@@ -1218,13 +1218,18 @@ static void rtl92c_dm_refresh_rate_adaptive_mask(struct ieee80211_hw *hw)
("PreState = %d, CurState = %d\n",
p_ra->pre_ratr_state, p_ra->ratr_state));
- rcu_read_lock();
- sta = ieee80211_find_sta(mac->vif, mac->bssid);
+ /* Only the PCI card uses sta in the update rate table
+ * callback routine */
+ if (rtlhal->interface == INTF_PCI) {
+ rcu_read_lock();
+ sta = ieee80211_find_sta(mac->vif, mac->bssid);
+ }
rtlpriv->cfg->ops->update_rate_tbl(hw, sta,
p_ra->ratr_state);
p_ra->pre_ratr_state = p_ra->ratr_state;
- rcu_read_unlock();
+ if (rtlhal->interface == INTF_PCI)
+ rcu_read_unlock();
}
}
}