[PATCH v5 1/7] pinctrl: freescale: imx: fix system crash if enable two pinctl instances

[Shawn Guo]

On Thu, Sep 24, 2015 at 03:53:57PM -0500, Adrian Alonso wrote:
> From: Robin Gong <b38343 at freescale.com>
> 
> 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 <b38343 at freescale.com>
> Signed-off-by: Adrian Alonso <aalonso at freescale.com>

Acked-by: Shawn Guo <shawnguo at kernel.org>