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SubjectRe: [PATCH] watchdog: qcom: fix kernel panic due to external abort on non-linefetch
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On 11/13/2016 05:11 PM, Christian Lamparter wrote:
> This patch fixes a off-by-one in the "watchdog: qcom: add option for
> standalone watchdog not in timer block" patch that causes the
> following panic on boot:
>
>> Unhandled fault: external abort on non-linefetch (0x1008) at 0xc8874002
>> pgd = c0204000
>> [c8874002] *pgd=87806811, *pte=0b017653, *ppte=0b017453
>> Internal error: : 1008 [#1] SMP ARM
>> CPU: 2 PID: 1 Comm: swapper/0 Not tainted 4.8.6 #0
>> Hardware name: Generic DT based system
>> PC is at 0xc02222f4
>> LR is at 0x1
>> pc : [<c02222f4>] lr : [<00000001>] psr: 00000113
>> sp : c782fc98 ip : 00000003 fp : 00000000
>> r10: 00000004 r9 : c782e000 r8 : c04ab98c
>> r7 : 00000001 r6 : c8874002 r5 : c782fe00 r4 : 00000002
>> r3 : 00000000 r2 : c782fe00 r1 : 00100000 r0 : c8874002
>> Flags: nzcv IRQs on FIQs on Mode SVC_32 ISA ARM Segment none
>> Control: 10c5387d Table: 8020406a DAC: 00000051
>> Process swapper/0 (pid: 1, stack limit = 0xc782e210)
>> Stack: (0xc782fc98 to 0xc7830000)
>> [...]
>
> The WDT_STS (status) needs to be translated via wdt_addr as well.
>
> fixes: f0d9d0f4b44a ("watchdog: qcom: add option for standalone watchdog not in timer block")
> Cc: stable@vger.kernel.org # 4.8
> Signed-off-by: Christian Lamparter <chunkeey@gmail.com>

Reviewed-by: Guenter Roeck <linux@roeck-us.net>

> ---
> drivers/watchdog/qcom-wdt.c | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/drivers/watchdog/qcom-wdt.c b/drivers/watchdog/qcom-wdt.c
> index 5796b5d..4f47b5e 100644
> --- a/drivers/watchdog/qcom-wdt.c
> +++ b/drivers/watchdog/qcom-wdt.c
> @@ -209,7 +209,7 @@ static int qcom_wdt_probe(struct platform_device *pdev)
> wdt->wdd.parent = &pdev->dev;
> wdt->layout = regs;
>
> - if (readl(wdt->base + WDT_STS) & 1)
> + if (readl(wdt_addr(wdt, WDT_STS)) & 1)
> wdt->wdd.bootstatus = WDIOF_CARDRESET;
>
> /*
>

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