This is a note to let you know that I've just added the patch titled
netconsole: don't call __netpoll_cleanup() while atomic
to the 3.8-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:
netconsole-don-t-call-__netpoll_cleanup-while-atomic.patch
and it can be found in the queue-3.8 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <[email protected]> know about it.
>From 27510f26c7b4b94b94b5ebd516763e948d546d3a Mon Sep 17 00:00:00 2001
From: Veaceslav Falico <[email protected]>
Date: Mon, 11 Mar 2013 00:21:48 +0000
Subject: netconsole: don't call __netpoll_cleanup() while atomic
From: Veaceslav Falico <[email protected]>
[ Upstream commit 3f315bef23075ea8a98a6fe4221a83b83456d970 ]
__netpoll_cleanup() is called in netconsole_netdev_event() while holding a
spinlock. Release/acquire the spinlock before/after it and restart the
loop. Also, disable the netconsole completely, because we won't have chance
after the restart of the loop, and might end up in a situation where
nt->enabled == 1 and nt->np.dev == NULL.
Signed-off-by: Veaceslav Falico <[email protected]>
Acked-by: Neil Horman <[email protected]>
Signed-off-by: David S. Miller <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>
---
drivers/net/netconsole.c | 15 +++++++++------
1 file changed, 9 insertions(+), 6 deletions(-)
--- a/drivers/net/netconsole.c
+++ b/drivers/net/netconsole.c
@@ -630,6 +630,7 @@ static int netconsole_netdev_event(struc
goto done;
spin_lock_irqsave(&target_list_lock, flags);
+restart:
list_for_each_entry(nt, &target_list, list) {
netconsole_target_get(nt);
if (nt->np.dev == dev) {
@@ -642,15 +643,17 @@ static int netconsole_netdev_event(struc
case NETDEV_UNREGISTER:
/*
* rtnl_lock already held
+ * we might sleep in __netpoll_cleanup()
*/
- if (nt->np.dev) {
- __netpoll_cleanup(&nt->np);
- dev_put(nt->np.dev);
- nt->np.dev = NULL;
- }
+ spin_unlock_irqrestore(&target_list_lock,
flags);
+ __netpoll_cleanup(&nt->np);
+ spin_lock_irqsave(&target_list_lock, flags);
+ dev_put(nt->np.dev);
+ nt->np.dev = NULL;
nt->enabled = 0;
stopped = true;
- break;
+ netconsole_target_put(nt);
+ goto restart;
}
}
netconsole_target_put(nt);
Patches currently in stable-queue which might be from [email protected] are
queue-3.8/netconsole-don-t-call-__netpoll_cleanup-while-atomic.patch
queue-3.8/bonding-don-t-call-update_speed_duplex-under-spinlocks.patch
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