[<prev] [next>] [thread-next>] [day] [month] [year] [list]
Message-Id: <20151028014323.29894.70699.sendpatchset@little-apple>
Date: Wed, 28 Oct 2015 10:43:23 +0900
From: Magnus Damm <magnus.damm@...il.com>
To: daniel.lezcano@...aro.org
Cc: laurent.pinchart+renesas@...asonboard.com, geert+renesas@...der.be,
linux-sh@...r.kernel.org, viresh.kumar@...aro.org,
linux-kernel@...r.kernel.org, chris.brandt@...esas.com,
horms+renesas@...ge.net.au, Magnus Damm <magnus.damm@...il.com>,
tglx@...utronix.de
Subject: [PATCH] clocksource: sh_mtu2: Fix multiple shutdown call issue
From: Magnus Damm <damm+renesas@...nsource.se>
On the r7s72100 Genmai board the MTU2 driver currently triggers a common
clock framework WARN_ON(enable_count) when disabling the clock due to
the MTU2 driver after recent callback rework may call ->set_state_shutdown()
multiple times. A similar issue was spotted for the TMU driver and fixed in:
452b132 clocksource/drivers/sh_tmu: Fix traceback spotted in -next
On r7s72100 Genmai v4.3-rc7 built with shmobile_defconfig spits out the
following during boot:
sh_mtu2 fcff0000.timer: ch0: used for clock events
------------[ cut here ]------------
WARNING: CPU: 0 PID: 1 at drivers/clk/clk.c:675 clk_core_disable+0x2c/0x6c()
CPU: 0 PID: 1 Comm: swapper/0 Not tainted 4.3.0-rc7 #1
Hardware name: Generic R7S72100 (Flattened Device Tree)
Backtrace:
[<c00133d4>] (dump_backtrace) from [<c0013570>] (show_stack+0x18/0x1c)
r6:c0621fde r5:00000009 r4:00000000 r3:00200040
[<c0013558>] (show_stack) from [<c01c7aac>] (dump_stack+0x74/0x90)
[<c01c7a38>] (dump_stack) from [<c00272fc>] (warn_slowpath_common+0x88/0xb4)
r4:00000000 r3:00000000
[<c0027274>] (warn_slowpath_common) from [<c0027400>] (warn_slowpath_null+0x24/0x2c)
r8:c78c0400 r7:c7ee8df8 r6:00000000 r5:600001d3 r4:c7806480
[<c00273dc>] (warn_slowpath_null) from [<c03a9320>] (clk_core_disable+0x2c/0x6c)
[<c03a92f4>] (clk_core_disable) from [<c03aa0a0>] (clk_disable+0x40/0x4c)
r4:c791be40 r3:00000000
[<c03aa060>] (clk_disable) from [<c0395d2c>] (sh_mtu2_disable+0x24/0x50)
r5:00000001 r4:c7963c00
[<c0395d08>] (sh_mtu2_disable) from [<c0395d6c>] (sh_mtu2_clock_event_shutdown+0x14/0x1c)
r4:c7963c40 r3:c0395d58
[<c0395d58>] (sh_mtu2_clock_event_shutdown) from [<c007d7d0>] (clockevents_switch_state+0xc8/0x114)
[<c007d708>] (clockevents_switch_state) from [<c007d834>] (clockevents_shutdown+0x18/0x28)
r5:c7963c40 r4:c7963c40
[<c007d81c>] (clockevents_shutdown) from [<c007dd58>] (clockevents_exchange_device+0x70/0x78)
r4:00000000 r3:00000000
[<c007dce8>] (clockevents_exchange_device) from [<c007e578>] (tick_check_new_device+0x88/0xe0)
r5:00000000 r4:c7963c40
[<c007e4f0>] (tick_check_new_device) from [<c007daf0>] (clockevents_register_device+0xac/0x120)
r7:00000000 r6:a0000153 r5:c06ffe98 r4:c7963c40
[<c007da44>] (clockevents_register_device) from [<c0395be8>] (sh_mtu2_probe+0x230/0x350)
r6:00000000 r5:c7963c00 r4:c791b040 r3:c06ff134
[<c03959b8>] (sh_mtu2_probe) from [<c028b6f0>] (platform_drv_probe+0x50/0x98)
Reported-by: Chris Brandt <chris.brandt@...esas.com>
Fixes: 19a9ffb ("clockevents/drivers/sh_mtu2: Migrate to new 'set-state' interface")
Cc: Viresh Kumar <viresh.kumar@...aro.org>
Cc: Laurent Pinchart <laurent.pinchart+renesas@...asonboard.com>
Signed-off-by: Magnus Damm <damm+renesas@...nsource.se>
---
drivers/clocksource/sh_mtu2.c | 4 +++-
1 file changed, 3 insertions(+), 1 deletion(-)
--- 0001/drivers/clocksource/sh_mtu2.c
+++ work/drivers/clocksource/sh_mtu2.c 2015-10-27 16:20:07.350513000 +0900
@@ -280,7 +280,9 @@ static int sh_mtu2_clock_event_shutdown(
{
struct sh_mtu2_channel *ch = ced_to_sh_mtu2(ced);
- sh_mtu2_disable(ch);
+ if (clockevent_state_periodic(ced))
+ sh_mtu2_disable(ch);
+
return 0;
}
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/
Powered by blists - more mailing lists