linux-stable/arch/avr32
Gabor Juhos 1b0135b5e2 avr32: fix clockevents kernel warning
Since commit 01426478df
(avr32: Use generic idle loop) the kernel throws the
following warning on avr32:

  WARNING: at 900322e4 [verbose debug info unavailable]
  Modules linked in:
  CPU: 0 PID: 0 Comm: swapper Not tainted 3.12.0-rc2 #117
  task: 901c3ecc ti: 901c0000 task.ti: 901c0000
  PC is at cpu_idle_poll_ctrl+0x1c/0x38
  LR is at comparator_mode+0x3e/0x40
  pc : [<900322e4>]    lr : [<90014882>]    Not tainted
  sp : 901c1f74  r12: 00000000  r11: 901c74a0
  r10: 901d2510  r9 : 00000001  r8 : 901db4de
  r7 : 901c74a0  r6 : 00000001  r5 : 00410020  r4 : 901db574
  r3 : 00410024  r2 : 90206fe0  r1 : 00000000  r0 : 007f0000
  Flags: qvnzc
  Mode bits: hjmde....G
  CPU Mode: Supervisor
  Call trace:
   [<90039ede>] clockevents_set_mode+0x16/0x2e
   [<90039f00>] clockevents_shutdown+0xa/0x1e
   [<9003a078>] clockevents_exchange_device+0x58/0x70
   [<9003a78c>] tick_check_new_device+0x38/0x54
   [<9003a1a2>] clockevents_register_device+0x32/0x90
   [<900035c4>] time_init+0xa8/0x108
   [<90000520>] start_kernel+0x128/0x23c

When the 'avr32_comparator' clockevent device is registered,
the clockevent core sets the mode of that clockevent device
to CLOCK_EVT_MODE_SHUTDOWN. Due to this, the 'comparator_mode'
function calls the 'cpu_idle_poll_ctrl' to disables idle poll.
This results in the aforementioned warning because the polling
is not enabled yet.

Change the code to only disable idle poll if it is enabled by
the same function to avoid the warning.

Cc: stable@vger.kernel.org
Signed-off-by: Gabor Juhos <juhosg@openwrt.org>
Acked-by: Hans-Christian Egtvedt <egtvedt@samfundet.no>
2013-09-30 08:42:01 +02:00
..
boards avr32: boards/atngw100/mrmt.c: fix building error 2013-08-08 14:16:22 +02:00
boot Kbuild: centralize MKIMAGE and cmd_uimage definitions 2012-03-26 15:49:20 +02:00
configs MMC highlights for 3.10: 2013-05-04 13:45:17 -07:00
include avr32: use Kbuild infrastructure to handle the asm-generic headers 2013-09-30 08:42:01 +02:00
kernel avr32: fix clockevents kernel warning 2013-09-30 08:42:01 +02:00
lib ARCH: drivers remove __dev* attributes. 2013-01-03 15:57:13 -08:00
mach-at32ap mtd: atmel_nand: replace cpu_is_at32ap7000() with a nand platform data 2013-08-05 20:55:42 +01:00
mm arch: mm: pass userspace fault flag to generic fault handler 2013-09-12 15:38:01 -07:00
oprofile oprofilefs_create_...() do not need superblock argument 2013-09-03 22:52:48 -04:00
Kconfig Remove GENERIC_HARDIRQ config option 2013-09-13 15:09:52 +02:00
Kconfig.debug
Makefile kbuild: allow assignment to {A,C,LD}FLAGS_MODULE on the command line 2010-08-03 14:09:45 +02:00