[PATCH 2/2] printk: Debug patch 2

Jan Kara
2014-10-10T14:24:12Z

kernel/printk/printk.c | 14 ++++++++------
1 file changed, 8 insertions(+), 6 deletions(-)

diff --git a/kernel/printk/printk.c b/kernel/printk/printk.c
index a39f4129f848..00a9ad5c2708 100644
--- a/kernel/printk/printk.c
+++ b/kernel/printk/printk.c
@@ -1718,17 +1718,19 @@ asmlinkage int vprintk_emit(int facility, int level,

logbuf_cpu = UINT_MAX;
raw_spin_unlock(&logbuf_lock);
- local_irq_restore(flags);
-
- /* If called from the scheduler, we can not call up(). */
- if (in_sched)
- return printed_len;
-
/*
* Disable preemption to avoid being preempted while holding
* console_sem which would prevent anyone from printing to console
*/
preempt_disable();
+ local_irq_restore(flags);
+
+ /* If called from the scheduler, we can not call up(). */
+ if (in_sched) {
+ preempt_enable();
+ return printed_len;
+ }
+
/*
* Try to acquire and then immediately release the console semaphore.
* The release will print out buffers and wake up /dev/kmsg and syslog()