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authorPeter Zijlstra <peterz@infradead.org>2011-06-22 11:20:09 +0200
committerIngo Molnar <mingo@elte.hu>2011-06-22 11:39:34 +0200
commit4f2a8d3cf5e0486fd547633fa86c5d130ae98cad (patch)
tree4f60a635565fd63473e5c23f45745b3b502a1d52 /kernel/printk.c
parent0b5e1c5255e7ee8670e077e8224e5c2281229a5b (diff)
printk: Fix console_sem vs logbuf_lock unlock race
Fix up the fallout from commit 0b5e1c5255 ("printk: Release console_sem after logbuf_lock"). The reason for unlocking the console_sem under the logbuf_lock is that a concurrent printk() might fill up the buffer but fail to acquire the console sem, resulting in a missed write to the console until a subsequent console_sem acquire/release cycle. Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl> Cc: efault@gmx.de Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Andrew Morton <akpm@linux-foundation.org> Link: http://lkml.kernel.org/r/1308734409.1022.14.camel@twins Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'kernel/printk.c')
-rw-r--r--kernel/printk.c20
1 files changed, 18 insertions, 2 deletions
diff --git a/kernel/printk.c b/kernel/printk.c
index 751e7b84e9e..37dff3429ad 100644
--- a/kernel/printk.c
+++ b/kernel/printk.c
@@ -1244,7 +1244,7 @@ void console_unlock(void)
{
unsigned long flags;
unsigned _con_start, _log_end;
- unsigned wake_klogd = 0;
+ unsigned wake_klogd = 0, retry = 0;
if (console_suspended) {
up(&console_sem);
@@ -1253,6 +1253,7 @@ void console_unlock(void)
console_may_schedule = 0;
+again:
for ( ; ; ) {
spin_lock_irqsave(&logbuf_lock, flags);
wake_klogd |= log_start - log_end;
@@ -1273,8 +1274,23 @@ void console_unlock(void)
if (unlikely(exclusive_console))
exclusive_console = NULL;
- spin_unlock_irqrestore(&logbuf_lock, flags);
+ spin_unlock(&logbuf_lock);
+
up(&console_sem);
+
+ /*
+ * Someone could have filled up the buffer again, so re-check if there's
+ * something to flush. In case we cannot trylock the console_sem again,
+ * there's a new owner and the console_unlock() from them will do the
+ * flush, no worries.
+ */
+ spin_lock(&logbuf_lock);
+ if (con_start != log_end)
+ retry = 1;
+ spin_unlock_irqrestore(&logbuf_lock, flags);
+ if (retry && console_trylock())
+ goto again;
+
if (wake_klogd)
wake_up_klogd();
}