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| author | Paul E. McKenney <paulmck@linux.vnet.ibm.com> | 2012-10-15 21:35:59 -0700 |
|---|---|---|
| committer | Ben Hutchings <ben@decadent.org.uk> | 2014-04-02 00:59:00 +0100 |
| commit | d8db5f989887fe1d37757d02caf47cbc6cc49199 (patch) | |
| tree | e1e9b0fe09e3b81f368b52c21bcb7541842cadae | |
| parent | 7f4d7e8fe42d3a34994055355694236f489c874f (diff) | |
| download | lwn-d8db5f989887fe1d37757d02caf47cbc6cc49199.tar.gz lwn-d8db5f989887fe1d37757d02caf47cbc6cc49199.zip | |
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>
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
| -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 16688ecc918e..8fac434b0bcc 100644 --- a/kernel/printk.c +++ b/kernel/printk.c @@ -1165,7 +1165,6 @@ 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(); |