linux-kernel - Re: [PATCH] mfd: mt6360: Fix register driver NULL pointer by add driver name

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Message-ID: <20200608192829.GG4106@dell>
Date:   Mon, 8 Jun 2020 20:28:29 +0100
From:   Lee Jones <lee.jones@...aro.org>
To:     Gene Chen <gene.chen.richtek@...il.com>
Cc:     matthias.bgg@...il.com, linux-arm-kernel@...ts.infradead.org,
        linux-mediatek@...ts.infradead.org, linux-kernel@...r.kernel.org,
        gene_chen@...htek.com, Wilma.Wu@...iatek.com,
        shufan_lee@...htek.com, cy_huang@...htek.com
Subject: Re: [PATCH] mfd: mt6360: Fix register driver NULL pointer by add
 driver name

On Mon, 08 Jun 2020, Gene Chen wrote:

> From: Gene Chen <gene_chen@...htek.com>
> 
> accidentally remove driver name when
> replace probe by probe_new in add mt6360 mfd driver patch v4
> 
> [  121.243012] EAX: c2a8bc64 EBX: 00000000 ECX: 00000000 EDX: 00000000
> [  121.243012] ESI: c2a8bc79 EDI: 00000000 EBP: e54bdea8 ESP: e54bdea0
> [  121.243012] DS: 007b ES: 007b FS: 0000 GS: 0000 SS: 0068 EFLAGS: 00010286
> [  121.243012] CR0: 80050033 CR2: 00000000 CR3: 02ec3000 CR4: 000006b0
> [  121.243012] Call Trace:
> [  121.243012]  kset_find_obj+0x3d/0xc0
> [  121.243012]  driver_find+0x16/0x40
> [  121.243012]  driver_register+0x49/0x100
> [  121.243012]  ? i2c_for_each_dev+0x39/0x50
> [  121.243012]  ? __process_new_adapter+0x20/0x20
> [  121.243012]  ? cht_wc_driver_init+0x11/0x11
> [  121.243012]  i2c_register_driver+0x30/0x80
> [  121.243012]  ? intel_lpss_pci_driver_init+0x16/0x16
> [  121.243012]  mt6360_pmu_driver_init+0xf/0x11
> [  121.243012]  do_one_initcall+0x33/0x1a0
> [  121.243012]  ? parse_args+0x1eb/0x3d0
> [  121.243012]  ? __might_sleep+0x31/0x90
> [  121.243012]  ? kernel_init_freeable+0x10a/0x17f
> [  121.243012]  kernel_init_freeable+0x12c/0x17f
> [  121.243012]  ? rest_init+0x110/0x110
> [  121.243012]  kernel_init+0xb/0x100
> [  121.243012]  ? schedule_tail_wrapper+0x9/0xc
> [  121.243012]  ret_from_fork+0x19/0x24
> [  121.243012] Modules linked in:
> [  121.243012] CR2: 0000000000000000
> [  121.243012] random: get_random_bytes called from init_oops_id+0x3a/0x40 with crng_init=0
> [  121.243012] ---[ end trace 38a803400f1a2bee ]---
> [  121.243012] EIP: strcmp+0x11/0x30

How did this driver ever work for you?

> Signed-off-by: Gene Chen <gene_chen@...htek.com>
> ---
>  drivers/mfd/mt6360-core.c | 1 +
>  1 file changed, 1 insertion(+)
> 
> diff --git a/drivers/mfd/mt6360-core.c b/drivers/mfd/mt6360-core.c
> index db8cdf5..e9cacc2 100644
> --- a/drivers/mfd/mt6360-core.c
> +++ b/drivers/mfd/mt6360-core.c
> @@ -412,6 +412,7 @@ MODULE_DEVICE_TABLE(of, mt6360_pmu_of_id);
>  
>  static struct i2c_driver mt6360_pmu_driver = {
>  	.driver = {
> +		.name = "mt6360_pmu",
>  		.pm = &mt6360_pmu_pm_ops,
>  		.of_match_table = of_match_ptr(mt6360_pmu_of_id),
>  	},

-- 
Lee Jones [李琼斯]
Senior Technical Lead - Developer Services
Linaro.org │ Open source software for Arm SoCs
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