Subject: [PATCH v2 1/8] pinctrl: freescale: imx: fix system crash if enable two pinctl instances

From: [email-masked] (Shawn Guo)
Date: Mon, 7 Sep 2015 08:56:24 +0800

On Tue, Sep 01, 2015 at 05:49:06PM -0500, Adrian Alonso wrote:
> From: Robin Gong <[email-masked]>
> 
> Fix system chrash caused by groups whose number is smaller than the number
> of groups of the last pinctl instance which is not initialized.
> 
> iMX7D supports two iomux controllers (iomuxc-lpsr and iomuxc) on probing
> the second instance (iomuxc) the chrash below occurs.
> 
> Uncompressing Linux... done, booting the kernel.
> [    0.000000] Booting Linux on physical CPU 0x0
> [    0.000000] Linux version 4.2.0-next-20150901-00006-gebfa43c (aalonso at bluefly)
> [    0.000000] CPU: ARMv7 Processor [410fc075] revision 5 (ARMv7)
> [    0.000000] CPU: PIPT / VIPT nonaliasing data cache, VIPT aliasin instruction cache
> [    0.000000] Machine model: Freescale i.MX7 SabreSD Board
> [    0.661012] [<802a6cb0>] (strcmp) from [<802cc80c>] (imx_dt_node_to_map+0x58/0x208)
> [    0.668879] [<802cc80c>] (imx_dt_node_to_map) from [<802cbe24>] (pinctrl_dt_to_map+0x174/0x2b0)
> [    0.677654] [<802cbe24>] (pinctrl_dt_to_map) from [<802c8f18>] (pinctrl_get+0x100/0x424)
> [    0.685878] [<802c8f18>] (pinctrl_get) from [<802c9510>] (pinctrl_register+0x26c/0x480)
> [    0.694104] [<802c9510>] (pinctrl_register) from [<802ccf3c>] (imx_pinctrl_probe+0x580/0x6e8)
> [    0.702706] [<802ccf3c>] (imx_pinctrl_probe) from [<80351b58>] (platform_drv_probe+0x44/0xa4)
> [    0.711455] [<80351b58>] (platform_drv_probe) from [<803503ec>] (driver_probe_device+0x174/0x2b4)
> [    0.720405] [<803503ec>] (driver_probe_device) from [<803505fc>] (__driver_attach+0x8c/0x90)
> [    0.728982] [<803505fc>] (__driver_attach) from [<8034e930>] (bus_for_each_dev+0x6c/0xa0)
> [    0.737381] [<8034e930>] (bus_for_each_dev) from [<8034fb88>] (bus_add_driver+0x148/0x1f0)
> [    0.745804] [<8034fb88>] (bus_add_driver) from [<80350c00>] (driver_register+0x78/0xf8)
> [    0.753880] [<80350c00>] (driver_register) from [<800097d0>] (do_one_initcall+0x8c/0x1d4)
> [    0.762282] [<800097d0>] (do_one_initcall) from [<80987dac>] (kernel_init_freeable+0x144/0x1e4)
> [    0.771061] [<80987dac>] (kernel_init_freeable) from [<806d9c7c>] (kernel_init+0x8/0xe8)
> [    0.779285] [<806d9c7c>] (kernel_init) from [<8000f628>] (ret_from_fork+0x14/0x2c)
> [    0.786981] Code: e3520000 e5e32001 1afffffb e12fff1e (e4d03001)
> 
> Signed-off-by: Robin Gong <[email-masked]>
> Signed-off-by: Adrian Alonso <[email-masked]>

Please always remember to copy kernel at pengutronix.de on i.MX related
patches.

> ---
> Chages for V2:
> - Reorder patch series
> - Add platform boot up information on kernel error
> - Move gpr_index to imx_pinctrl_soc_info
> 
>  drivers/pinctrl/freescale/pinctrl-imx.c | 3 +--
>  drivers/pinctrl/freescale/pinctrl-imx.h | 1 +
>  2 files changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/pinctrl/freescale/pinctrl-imx.c b/drivers/pinctrl/freescale/pinctrl-imx.c
> index d7b98ba..95db9e8 100644
> --- a/drivers/pinctrl/freescale/pinctrl-imx.c
> +++ b/drivers/pinctrl/freescale/pinctrl-imx.c
> @@ -580,7 +580,6 @@ static int imx_pinctrl_parse_functions(struct device_node *np,
>  	struct device_node *child;
>  	struct imx_pmx_func *func;
>  	struct imx_pin_group *grp;
> -	static u32 grp_index;
>  	u32 i = 0;
>  
>  	dev_dbg(info->dev, "parse function(%d): %s\n", index, np->name);
> @@ -599,7 +598,7 @@ static int imx_pinctrl_parse_functions(struct device_node *np,
>  
>  	for_each_child_of_node(np, child) {
>  		func->groups[i] = child->name;
> -		grp = &info->groups[grp_index++];
> +		grp = &info->groups[info->grp_index++];
>  		imx_pinctrl_parse_groups(child, grp, info, i++);
>  	}
>  
> diff --git a/drivers/pinctrl/freescale/pinctrl-imx.h b/drivers/pinctrl/freescale/pinctrl-imx.h
> index 49e55d3..26f8f1c 100644
> --- a/drivers/pinctrl/freescale/pinctrl-imx.h
> +++ b/drivers/pinctrl/freescale/pinctrl-imx.h
> @@ -81,6 +81,7 @@ struct imx_pinctrl_soc_info {
>  	struct imx_pmx_func *functions;
>  	unsigned int nfunctions;
>  	unsigned int flags;
> +	u32 grp_index;

I would suggest you move this around to group it with 'groups'
variables, something like below.

	struct imx_pin_group *groups;
	unsigned int ngroups;
	unsigned int group_index;

Shawn

>  };
>  
>  #define SHARE_MUX_CONF_REG	0x1
> -- 
> 2.1.4
> 
> 
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