linux-kernel - Re: [PATCH] iio: adc: vf610_adc: Fix division by zero error

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Date:	Mon, 26 Oct 2015 10:33:08 +0000
From:	Duan Andy <fugang.duan@...escale.com>
To:	Sanchayan Maity <maitysanchayan@...il.com>,
	"jic23@...nel.org" <jic23@...nel.org>
CC:	"stefan@...er.ch" <stefan@...er.ch>,
	"linux-iio@...r.kernel.org" <linux-iio@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] iio: adc: vf610_adc: Fix division by zero error

From: Sanchayan Maity <maitysanchayan@...il.com> Sent: Monday, October 19, 2015 3:43 PM
>To: jic23@...nel.org
>Cc: stefan@...er.ch; Duan Fugang-B38611; linux-iio@...r.kernel.org; linux->kernel@...r.kernel.org; Sanchayan Maity
>Subject: [PATCH] iio: adc: vf610_adc: Fix division by zero error
>
>In case the fsl,adck-max-frequency property is not present in
>the device tree, a division by zero error results during the
>probe call on kernel boot (see below). This patch fixes it and
>also restores device tree compatibility in case kernels are
>booting with old device trees without this property specified.
>
>[    1.063229] Division by zero in kernel.
>[    1.067152] CPU: 0 PID: 1 Comm: swapper Not tainted
>4.3.0-rc5-00212-gcc88cef #37
>[    1.074650] Hardware name: Freescale Vybrid VF5xx/VF6xx (Device Tree)
>[    1.081135] Backtrace:
>[    1.083694] [<800134a4>] (dump_backtrace) from [<8001369c>]
>(show_stack+0x18/0x1c)
>[    1.091340]  r7:00000008 r6:8e0ae210 r5:00000000 r4:8e299800
>[    1.097146] [<80013684>] (show_stack) from [<80297b1c>]
>(dump_stack+0x24/0x28)
>[    1.104483] [<80297af8>] (dump_stack) from [<80013608>]
>(__div0+0x1c/0x20)
>[    1.111421] [<800135ec>] (__div0) from [<802968b4>] (Ldiv0+0x8/0x10)
>[    1.117865] [<80424350>] (vf610_adc_probe) from [<803153b4>]
>(platform_drv_probe+0x4c/0xac)
>[    1.126311]  r10:00000000 r9:8076a5ec r8:00000000 r7:fffffdfb
>r6:807cc67c r5:8e0ae210
>[    1.134319]  r4:807f6c54
>[    1.136915] [<80315368>] (platform_drv_probe) from [<803138bc>]
>(driver_probe_device+0x20c/0x2f8)
>[    1.145882]  r7:807cc67c r6:00000000 r5:8e0ae210 r4:807f6c54
>[    1.151657] [<803136b0>] (driver_probe_device) from [<80313a3c>]
>(__driver_attach+0x94/0x98)
>[    1.160190]  r9:8076a5ec r8:00000098 r7:00000000 r6:8e0ae244
>r5:807cc67c r4:8e0ae210
>[    1.168112] [<803139a8>] (__driver_attach) from [<80311cb8>]
>(bus_for_each_dev+0x70/0xa4)
>[    1.176383]  r7:00000000 r6:803139a8 r5:807cc67c r4:00000000
>[    1.182159] [<80311c48>] (bus_for_each_dev) from [<80313318>]
>(driver_attach+0x24/0x28)
>[    1.190260]  r6:807bb568 r5:8e2a5b00 r4:807cc67c
>[    1.194996] [<803132f4>] (driver_attach) from [<80312f50>]
>(bus_add_driver+0x1a4/0x21c)
>[    1.203113] [<80312dac>] (bus_add_driver) from [<803142a8>]
>(driver_register+0x80/0x100)
>[    1.211275]  r7:8e2a7dc0 r6:807a8160 r5:80789e14 r4:807cc67c
>[    1.217075] [<80314228>] (driver_register) from [<803152f8>]
>(__platform_driver_register+0x5c/0x64)
>[    1.226216]  r5:80789e14 r4:807a8160
>[    1.229877] [<8031529c>] (__platform_driver_register) from
>[<80789e30>] (vf610_adc_driver_init+0x1c/0x20)
>[    1.239556] [<80789e14>] (vf610_adc_driver_init) from [<800095f8>]
>(do_one_initcall+0x94/0x1dc)
>[    1.248365] [<80009564>] (do_one_initcall) from [<8076ae34>]
>(kernel_init_freeable+0x13c/0x1e0)
>[    1.257155]  r10:80794830 r9:8076a5ec r8:00000098 r7:807d5780
>r6:807d5780 r5:00000006
>[    1.265153]  r4:807a0ee8
>[    1.267753] [<8076acf8>] (kernel_init_freeable) from [<80590ef0>]
>(kernel_init+0x18/0xf0)
>[    1.276021]  r10:00000000 r9:00000000 r8:00000000 r7:00000000
>r6:00000000 r5:80590ed8
>[    1.284015]  r4:807d5780
>[    1.286615] [<80590ed8>] (kernel_init) from [<8000f878>]
>(ret_from_fork+0x14/0x3c)
>[    1.294278]  r5:80590ed8 r4:00000000
>
>Signed-off-by: Sanchayan Maity <maitysanchayan@...il.com>

 Acked-by: Fugang Duan <B38611@...escale.com>--
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