From: gregkh@linuxfoundation•org (Greg Kroah-Hartman)
To: linux-arm-kernel@lists•infradead.org
Subject: [PATCH 4.4 131/342] clockevents/tcb_clksrc: Prevent disabling an already disabled clock
Date: Tue, 01 Mar 2016 23:54:42 +0000 [thread overview]
Message-ID: <20160301234532.180551567@linuxfoundation.org> (raw)
In-Reply-To: <20160301234527.990448862@linuxfoundation.org>
4.4-stable review patch. If anyone has any objections, please let me know.
------------------
From: Alexandre Belloni <alexandre.belloni@free-electrons•com>
commit f02b4b72d12cbae7020a959e2ed0410a464b4cc4 upstream.
clockevents_exchange_device is calling clockevents_shutdown() on the new
clockenvents device but it may have never been enabled in the first place.
This results in the tcb clock being disabled without being enabled first:
------------[ cut here ]------------
WARNING: CPU: 0 PID: 1 at drivers/clk/clk.c:680 clk_disable+0x28/0x34()
Modules linked in:
CPU: 0 PID: 1 Comm: swapper Not tainted 4.4.0+ #6
Hardware name: Atmel AT91SAM9
[<c000f2b8>] (unwind_backtrace) from [<c000d01c>] (show_stack+0x10/0x14)
[<c000d01c>] (show_stack) from [<c00172f0>] (warn_slowpath_common+0x78/0xa0)
[<c00172f0>] (warn_slowpath_common) from [<c00173a8>] (warn_slowpath_null+0x18/0x20)
[<c00173a8>] (warn_slowpath_null) from [<c0361528>] (clk_disable+0x28/0x34)
[<c0361528>] (clk_disable) from [<c034d560>] (tc_shutdown+0x38/0x4c)
[<c034d560>] (tc_shutdown) from [<c0059ad4>] (clockevents_switch_state+0x38/0x6c)
[<c0059ad4>] (clockevents_switch_state) from [<c0059b18>] (clockevents_shutdown+0x10/0x24)
[<c0059b18>] (clockevents_shutdown) from [<c005a458>] (tick_check_new_device+0x84/0xac)
[<c005a458>] (tick_check_new_device) from [<c0059660>] (clockevents_register_device+0x7c/0x108)
[<c0059660>] (clockevents_register_device) from [<c06b5a68>] (tcb_clksrc_init+0x390/0x3e8)
[<c06b5a68>] (tcb_clksrc_init) from [<c00097cc>] (do_one_initcall+0x114/0x1d4)
[<c00097cc>] (do_one_initcall) from [<c069bd54>] (kernel_init_freeable+0xfc/0x1b8)
[<c069bd54>] (kernel_init_freeable) from [<c04c3818>] (kernel_init+0x8/0xe0)
[<c04c3818>] (kernel_init) from [<c000a410>] (ret_from_fork+0x14/0x24)
---[ end trace 0000000000000001 ]---
Check what state we were in before trying to disable the clock.
Fixes: cf4541c101ea ("clockevents/drivers/tcb_clksrc: Migrate to new 'set-state' interface")
Signed-off-by: Alexandre Belloni <alexandre.belloni@free-electrons•com>
Cc: Nicolas Ferre <nicolas.ferre@atmel•com>
Cc: Boris Brezillon <boris.brezillon@free-electrons•com>
Cc: linux-arm-kernel at lists.infradead.org
Cc: Daniel Lezcano <daniel.lezcano@linaro•org>
Link: http://lkml.kernel.org/r/1452854061-30370-1-git-send-email-alexandre.belloni at free-electrons.com
Signed-off-by: Thomas Gleixner <tglx@linutronix•de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation•org>
---
drivers/clocksource/tcb_clksrc.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
--- a/drivers/clocksource/tcb_clksrc.c
+++ b/drivers/clocksource/tcb_clksrc.c
@@ -98,7 +98,8 @@ static int tc_shutdown(struct clock_even
__raw_writel(0xff, regs + ATMEL_TC_REG(2, IDR));
__raw_writel(ATMEL_TC_CLKDIS, regs + ATMEL_TC_REG(2, CCR));
- clk_disable(tcd->clk);
+ if (!clockevent_state_detached(d))
+ clk_disable(tcd->clk);
return 0;
}
next parent reply other threads:[~2016-03-01 23:54 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <20160301234527.990448862@linuxfoundation.org>
2016-03-01 23:54 ` Greg Kroah-Hartman [this message]
2016-03-01 23:55 ` [PATCH 4.4 312/342] xen/arm: correctly handle DMA mapping of compound pages Greg Kroah-Hartman
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