This is a note to let you know that I've just added the patch titled
rtlwifi: Fix scheduling while atomic bug
to the 3.4-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
rtlwifi-fix-scheduling-while-atomic-bug.patch
and it can be found in the queue-3.4 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <[email protected]> know about it.
>From a5ffbe0a1993a27072742ef7db6cf9839956fce9 Mon Sep 17 00:00:00 2001
From: Larry Finger <[email protected]>
Date: Sat, 2 Feb 2013 15:55:00 -0600
Subject: rtlwifi: Fix scheduling while atomic bug
From: Larry Finger <[email protected]>
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 <[email protected]>
Reported-and-tested-by: Nathaniel Doherty <[email protected]>
Cc: Nathaniel Doherty <[email protected]>
Cc: Stanislaw Gruszka <[email protected]>
Signed-off-by: John W. Linville <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>
---
drivers/net/wireless/rtlwifi/base.c | 7 ++++---
1 file changed, 4 insertions(+), 3 deletions(-)
--- 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_
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_
}
} 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_
"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;
}
Patches currently in stable-queue which might be from [email protected]
are
queue-3.4/rtlwifi-fix-scheduling-while-atomic-bug.patch
queue-3.4/rtlwifi-fix-the-usage-of-the-wrong-variable-in-usb.c.patch
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