qemu-timer: properly arm alarm timer for timers set by device initialization

QEMU will hang when fed the following command-line

  qemu-system-mips -kernel vmlinux-2.6.32-5-4kc-malta -append "console=ttyS0" -nographic -net none

The -net none is important otherwise it seems some events are generated
causing the things to work. When it doesn't work, the guest hangs when
measuring the CPU frequency, after the following line:

  [    0.000000] NR_IRQS:256

Pressing a key on the serial port unblocks it, hinting that the problem
is due to the recent elimination of the 1 second timeout in the main
loop.

The problem is that because init_timer_alarm sets the timer's pending
flag to true, the alarm timer is never armed until after the first time
through the main loop.  Thus the bug started when QEMU started testing
the pending flag in qemu_mod_timer (commit 1828be3, more alarm timer
cleanup, 2010-03-10).

But actually, it isn't true at all that a timer is pending when the
alarm timer is created, and the real bug has been latent forever: the
fix is to remove the bogus setting of pending flag.

Reported-by: Aurelien Jarno <aurelien@aurel32.net>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Reviewed-by: Jan Kiszka <jan.kiszka@siemens.com>
Tested-by: Aurelien Jarno <aurelien@aurel32.net>
Tested-by: Michael Tokarev <mjt@tls.msk.ru>
Signed-off-by: Aurelien Jarno <aurelien@aurel32.net>

diff --git a/qemu-timer.c b/qemu-timer.c
index 5aea94e8e00ffb4ba6e93cfbfd2172e8d82ac787..c7a1551a3603db20b5ac08408a73d97a95c1f77b 100644 (file)
--- a/qemu-timer.c
+++ b/qemu-timer.c
@@ -759,11 +759,8 @@ int init_timer_alarm(void)
         goto fail;
     }
 
-    /* first event is at time 0 */
     atexit(quit_timers);
-    t->pending = true;
     alarm_timer = t;
-
     return 0;
 
 fail: