diff options
| author | Paul E. McKenney <paulmck@linux.vnet.ibm.com> | 2012-10-15 21:35:59 -0700 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2014-02-20 10:45:32 -0800 |
| commit | 5e23efd0c1d6c67761f859c141ba67bac80b81e0 (patch) | |
| tree | 1de16dc6a5c06a7fae118e8e3e2553645892a778 /kernel | |
| parent | 36f0c45db55e2e840deefc286a33c2c7aef2f18e (diff) | |
printk: Fix scheduling-while-atomic problem in console_cpu_notify()
commit 85eae82a0855d49852b87deac8653e4ebc8b291f upstream.
The console_cpu_notify() function runs with interrupts disabled in the
CPU_DYING case. It therefore cannot block, for example, as will happen
when it calls console_lock(). Therefore, remove the CPU_DYING leg of
the switch statement to avoid this problem.
Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Reviewed-by: Srivatsa S. Bhat <srivatsa.bhat@linux.vnet.ibm.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Guillaume Morin <guillaume@morinfr.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'kernel')
| -rw-r--r-- | kernel/printk.c | 1 |
1 files changed, 0 insertions, 1 deletions
diff --git a/kernel/printk.c b/kernel/printk.c index e95c66223d33..e131c464f332 100644 --- a/kernel/printk.c +++ b/kernel/printk.c @@ -1172,7 +1172,6 @@ static int __cpuinit console_cpu_notify(struct notifier_block *self, switch (action) { case CPU_ONLINE: case CPU_DEAD: - case CPU_DYING: case CPU_DOWN_FAILED: case CPU_UP_CANCELED: console_lock(); |