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dummy: fix rcu_sched self-detected stalls

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[ Upstream commit 16b0dc29c1 ]

Trying to "modprobe dummy numdummies=30000" triggers :

INFO: rcu_sched self-detected stall on CPU { 8} (t=60000 jiffies)

After this splat, RTNL is locked and reboot is needed.

We must call cond_resched() to avoid this, even holding RTNL.

Signed-off-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Eric Dumazet
2012-06-10 21:11:57 +00:00
committed by Greg Kroah-Hartman
parent e99e096f4b
commit 7dd0931198
1 changed files with 4 additions and 1 deletions
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5
drivers/net/dummy.c
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@@ -37,6 +37,7 @@
#include <linux/rtnetlink.h>
#include <net/rtnetlink.h>
#include <linux/u64_stats_sync.h>
#include <linux/sched.h>
static int numdummies = 1;
@@ -186,8 +187,10 @@ static int __init dummy_init_module(void)
rtnl_lock();
err = __rtnl_link_register(&dummy_link_ops);
for (i = 0; i < numdummies && !err; i++)
for (i = 0; i < numdummies && !err; i++) {
err = dummy_init_one();
cond_resched();
}
if (err < 0)
__rtnl_link_unregister(&dummy_link_ops);
rtnl_unlock();