pinctrl: freescale: imx: fix system crash if enable two pinctl instances

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@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@freescale.com>
Signed-off-by: Adrian Alonso <aalonso@freescale.com>
Acked-by: Shawn Guo <shawnguo@kernel.org>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>

diff --git a/drivers/pinctrl/freescale/pinctrl-imx.c b/drivers/pinctrl/freescale/pinctrl-imx.c
index d7b98ba36825b2a7b7008c46a558ceeb02b6120f..b9c6deb969247e9cb3b0f721d23ed0a6e2a0ee3f 100644 (file)
--- 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->group_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 49e55d39f7c8aba924f250dad6563148e4219b35..2a5fe729fe069bf9907e289614fadbab7cfac66e 100644 (file)
--- a/drivers/pinctrl/freescale/pinctrl-imx.h
+++ b/drivers/pinctrl/freescale/pinctrl-imx.h
@@ -78,6 +78,7 @@ struct imx_pinctrl_soc_info {
        struct imx_pin_reg *pin_regs;
        struct imx_pin_group *groups;
        unsigned int ngroups;
+       unsigned int group_index;
        struct imx_pmx_func *functions;
        unsigned int nfunctions;
        unsigned int flags;