This is a note to let you know that I've just added the patch titled
b43: Fix lockdep splat
to the 3.13-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:
b43-fix-lockdep-splat.patch
and it can be found in the queue-3.13 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 09164043f63c947a49797750a09ca1cd7c31108e Mon Sep 17 00:00:00 2001
From: Larry Finger <Larry.Finger@xxxxxxxxxxxx>
Date: Sun, 12 Jan 2014 15:11:37 -0600
Subject: b43: Fix lockdep splat
From: Larry Finger <Larry.Finger@xxxxxxxxxxxx>
commit 09164043f63c947a49797750a09ca1cd7c31108e upstream.
In https://bugzilla.kernel.org/show_bug.cgi?id=67561, a locking dependency is reported
when b43 is used with hostapd, and rfkill is used to kill the radio output.
The lockdep splat (in part) is as follows:
======================================================
[ INFO: possible circular locking dependency detected ]
3.12.0 #1 Not tainted
-------------------------------------------------------
rfkill/10040 is trying to acquire lock:
(rtnl_mutex){+.+.+.}, at: [<ffffffff8146f282>] rtnl_lock+0x12/0x20
but task is already holding lock:
(rfkill_global_mutex){+.+.+.}, at: [<ffffffffa04832ca>] rfkill_fop_write+0x6a/0x170 [rfkill]
--snip--
Chain exists of:
rtnl_mutex --> misc_mtx --> rfkill_global_mutex
The fix is to move the initialization of the hardware random number generator
outside the code range covered by the rtnl_mutex.
Reported-by: yury <urykhy@xxxxxxxxx>
Tested-by: yury <urykhy@xxxxxxxxx>
Signed-off-by: Larry Finger <Larry.Finger@xxxxxxxxxxxx>
Signed-off-by: John W. Linville <linville@xxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/net/wireless/b43/main.c | 17 +++++++++++------
1 file changed, 11 insertions(+), 6 deletions(-)
--- a/drivers/net/wireless/b43/main.c
+++ b/drivers/net/wireless/b43/main.c
@@ -2424,6 +2424,7 @@ error:
static int b43_one_core_attach(struct b43_bus_dev *dev, struct b43_wl *wl);
static void b43_one_core_detach(struct b43_bus_dev *dev);
+static int b43_rng_init(struct b43_wl *wl);
static void b43_request_firmware(struct work_struct *work)
{
@@ -2475,6 +2476,10 @@ start_ieee80211:
goto err_one_core_detach;
wl->hw_registred = true;
b43_leds_register(wl->current_dev);
+
+ /* Register HW RNG driver */
+ b43_rng_init(wl);
+
goto out;
err_one_core_detach:
@@ -4636,9 +4641,6 @@ static void b43_wireless_core_exit(struc
if (!dev || b43_status(dev) != B43_STAT_INITIALIZED)
return;
- /* Unregister HW RNG driver */
- b43_rng_exit(dev->wl);
-
b43_set_status(dev, B43_STAT_UNINIT);
/* Stop the microcode PSM. */
@@ -4795,9 +4797,6 @@ static int b43_wireless_core_init(struct
b43_set_status(dev, B43_STAT_INITIALIZED);
- /* Register HW RNG driver */
- b43_rng_init(dev->wl);
-
out:
return err;
@@ -5464,6 +5463,9 @@ static void b43_bcma_remove(struct bcma_
b43_one_core_detach(wldev->dev);
+ /* Unregister HW RNG driver */
+ b43_rng_exit(wl);
+
b43_leds_unregister(wl);
ieee80211_free_hw(wl->hw);
@@ -5541,6 +5543,9 @@ static void b43_ssb_remove(struct ssb_de
b43_one_core_detach(dev);
+ /* Unregister HW RNG driver */
+ b43_rng_exit(wl);
+
if (list_empty(&wl->devlist)) {
b43_leds_unregister(wl);
/* Last core on the chip unregistered.
Patches currently in stable-queue which might be from Larry.Finger@xxxxxxxxxxxx are
queue-3.13/b43-fix-lockdep-splat.patch
queue-3.13/staging-r8712u-set-device-type-to-wlan.patch
queue-3.13/rtlwifi-redo-register-save-locations.patch
queue-3.13/rtlwifi-rtl8192cu-add-new-device-id.patch
queue-3.13/rtlwifi-rtl8192c-add-new-definitions-in-the-dm_common-header.patch
queue-3.13/rtlwifi-rtl8192c-update-dynamic-gain-calculations.patch
queue-3.13/b43-fix-the-wrong-assignment-of-status.freq-in-b43_rx.patch
queue-3.13/b43-fix-unload-oops-if-firmware-is-not-available.patch
queue-3.13/rtlwifi-rtl8192cu-add-new-firmware.patch
queue-3.13/b43legacy-fix-unload-oops-if-firmware-is-not-available.patch
queue-3.13/rtlwifi-rtl8192cu-fix-some-code-in-rf-handling.patch
queue-3.13/rtlwifi-set-the-link-state.patch
queue-3.13/rtlwifi-increase-the-rx-queue-length-for-usb-drivers.patch
queue-3.13/rtlwifi-rtl8192c-add-routines-to-save-restore-power-index-registers.patch
queue-3.13/rtlwifi-rtl8192c-prevent-reconnect-attempts-if-not-connected.patch
queue-3.13/rtlwifi-rtl8188ee-fix-typo-in-code.patch
queue-3.13/rtlwifi-rtl8192cu-update-the-power-index-registers.patch
queue-3.13/rtlwifi-add-missing-code-to-pwdb-statics-routine.patch
queue-3.13/rtlwifi-update-beacon-statistics-for-usb-driver.patch
--
To unsubscribe from this list: send the line "unsubscribe stable" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html