rtlwifi: Fix scheduling while atomic bug

commit a5ffbe0a1993a27072742ef7db6cf9839956fce9 upstream.

Kernel commits 41affd5 and 6539306 changed the locking in rtl_lps_leave()
from a spinlock to a mutex by doing the calls indirectly from a work queue
to reduce the time that interrupts were disabled. This change was fine for
most systems; however a scheduling while atomic bug was reported in
https://bugzilla.redhat.com/show_bug.cgi?id=903881. The backtrace indicates
that routine rtl_is_special(), which calls rtl_lps_leave() in three places
was entered in atomic context. These direct calls are replaced by putting a
request on the appropriate work queue.

Signed-off-by: Larry Finger <Larry.Finger@lwfinger.net>
Reported-and-tested-by: Nathaniel Doherty <ntdoherty@gmail.com>
Cc: Nathaniel Doherty <ntdoherty@gmail.com>
Cc: Stanislaw Gruszka <sgruszka@redhat.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/net/wireless/rtlwifi/base.c b/drivers/net/wireless/rtlwifi/base.c
index e54488db0e10178bfb820da5d23eb0e2a54591f8..18d9eb3ad7af1676c2ff068c3a7646675bfc95ee 100644 (file)
--- a/drivers/net/wireless/rtlwifi/base.c
+++ b/drivers/net/wireless/rtlwifi/base.c
@@ -980,7 +980,8 @@ u8 rtl_is_special_data(struct ieee80211_hw *hw, struct sk_buff *skb, u8 is_tx)
                                         is_tx ? "Tx" : "Rx");
 
                                if (is_tx) {
-                                       rtl_lps_leave(hw);
+                                       schedule_work(&rtlpriv->
+                                                     works.lps_leave_work);
                                        ppsc->last_delaylps_stamp_jiffies =
                                            jiffies;
                                }
@@ -990,7 +991,7 @@ u8 rtl_is_special_data(struct ieee80211_hw *hw, struct sk_buff *skb, u8 is_tx)
                }
        } else if (ETH_P_ARP == ether_type) {
                if (is_tx) {
-                       rtl_lps_leave(hw);
+                       schedule_work(&rtlpriv->works.lps_leave_work);
                        ppsc->last_delaylps_stamp_jiffies = jiffies;
                }
 
@@ -1000,7 +1001,7 @@ u8 rtl_is_special_data(struct ieee80211_hw *hw, struct sk_buff *skb, u8 is_tx)
                         "802.1X %s EAPOL pkt!!\n", is_tx ? "Tx" : "Rx");
 
                if (is_tx) {
-                       rtl_lps_leave(hw);
+                       schedule_work(&rtlpriv->works.lps_leave_work);
                        ppsc->last_delaylps_stamp_jiffies = jiffies;
                }