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Fix rtlwifi scheduling while atomic from Larry Finger (rhbz 903881)

This commit is contained in:
Josh Boyer 2013-02-04 09:49:15 -05:00
parent d06e03b3b8
commit 2ee5453858
2 changed files with 75 additions and 1 deletions
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11
kernel.spec
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@ -54,7 +54,7 @@ Summary: The Linux kernel
# For non-released -rc kernels, this will be appended after the rcX and
# gitX tags, so a 3 here would become part of release "0.rcX.gitX.3"
#
%global baserelease 101
%global baserelease 102
%global fedora_build %{baserelease}
# base_sublevel is the kernel version we're starting with and patching
@ -754,6 +754,9 @@ Patch21239: Revert-iwlwifi-fix-the-reclaimed-packet-tracking-upon.patch
Patch21240: Input-increase-struct-ps2dev-cmdbuf-to-8-bytes.patch
Patch21242: Input-add-support-for-Cypress-PS2-Trackpads.patch
#rhbz 903881
Patch21246: rtlwifi-Fix-scheduling-while-atomic-bug.patch
# END OF PATCH DEFINITIONS
%endif
@ -1457,6 +1460,9 @@ ApplyPatch Revert-iwlwifi-fix-the-reclaimed-packet-tracking-upon.patch
ApplyPatch Input-increase-struct-ps2dev-cmdbuf-to-8-bytes.patch
ApplyPatch Input-add-support-for-Cypress-PS2-Trackpads.patch
#rhbz 903881
ApplyPatch rtlwifi-Fix-scheduling-while-atomic-bug.patch
# END OF PATCH APPLICATIONS
%endif
@ -2312,6 +2318,9 @@ fi
# '-' | |
# '-'
%changelog
* Mon Feb 04 2013 Josh Boyer <jwboyer@redhat.com> - 3.7.6-102
- Fix rtlwifi scheduling while atomic from Larry Finger (rhbz 903881)
* Mon Feb 04 2013 Justin M. Forbes <jforbes@redhat.com> - 3.7.6-101
- Linux v3.7.6

65
rtlwifi-Fix-scheduling-while-atomic-bug.patch Normal file
View File

@ -0,0 +1,65 @@
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>
Cc: Stable <stable@vger.kernel.org>
---
John,
If DaveM will still accept bug fixes for 3.8, please push this one. It
is unlikely to have any side effects.
Thanks,
Larry
---
base.c | 7 ++++---
1 file changed, 4 insertions(+), 3 deletions(-)
Index: wireless-testing-new/drivers/net/wireless/rtlwifi/base.c
===================================================================
--- wireless-testing-new.orig/drivers/net/wireless/rtlwifi/base.c
+++ wireless-testing-new/drivers/net/wireless/rtlwifi/base.c
@@ -1004,7 +1004,8 @@ 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;
}
@@ -1014,7 +1015,7 @@ 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;
}
@@ -1024,7 +1025,7 @@ 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;
}
--
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