| Message ID | 031d7dd666390aaf1b0566476c9661e6e674cae8.1529639050.git.sean.wang@mediatek.com (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
On Fri, Jun 22, 2018 at 5:49 AM <sean.wang@mediatek.com> wrote: > From: Sean Wang <sean.wang@mediatek.com> > > When we are explicitly using GPIO hogging mechanism in the pinctrl node, > such as: > > &pio { > line_input { > gpio-hog; > gpios = <95 0>, <96 0>, <97 0>; > input; > }; > }; > > A kernel panic happens at dereferencing a NULL pointer: In this case, the > drvdata is still not setup properly yet when it is being accessed. > > A better solution for fixing up this issue should be we should obtain the > private data from struct gpio_chip using a specific gpiochip_get_data > instead of a generic dev_get_drvdata. > > [ 0.249424] Unable to handle kernel NULL pointer dereference at virtual > address 000000c8 > [ 0.257818] Mem abort info: > [ 0.260704] ESR = 0x96000005 > [ 0.263869] Exception class = DABT (current EL), IL = 32 bits > [ 0.270011] SET = 0, FnV = 0 > [ 0.273167] EA = 0, S1PTW = 0 > [ 0.276421] Data abort info: > [ 0.279398] ISV = 0, ISS = 0x00000005 > [ 0.283372] CM = 0, WnR = 0 > [ 0.286440] [00000000000000c8] user address but active_mm is swapper > [ 0.293027] Internal error: Oops: 96000005 [#1] PREEMPT SMP > [ 0.298795] Modules linked in: > [ 0.301958] CPU: 0 PID: 1 Comm: swapper/0 Not tainted 4.16.0-rc1+ #389 > [ 0.308716] Hardware name: MediaTek MT7622 RFB1 board (DT) > [ 0.314396] pstate: 80000005 (Nzcv daif -PAN -UAO) > [ 0.319362] pc : mtk_hw_pin_field_get+0x28/0x118 > [ 0.324140] lr : mtk_hw_set_value+0x30/0x104 > [ 0.328557] sp : ffffff800801b6d0 > [ 0.331983] x29: ffffff800801b6d0 x28: ffffff80086b7970 > [ 0.337484] x27: 0000000000000000 x26: ffffff80087b8000 > [ 0.342986] x25: 0000000000000000 x24: ffffffc00324c230 > [ 0.348487] x23: 0000000000000003 x22: 0000000000000000 > [ 0.353988] x21: ffffff80087b8000 x20: 0000000000000000 > [ 0.359489] x19: 0000000000000054 x18: 00000000fffff7c0 > [ 0.364990] x17: 0000000000006300 x16: 000000000000003f > [ 0.370492] x15: 000000000000000e x14: ffffffffffffffff > [ 0.375993] x13: 0000000000000000 x12: 0000000000000020 > [ 0.381494] x11: 0000000000000006 x10: 0101010101010101 > [ 0.386995] x9 : fffffffffffffffa x8 : 0000000000000007 > [ 0.392496] x7 : ffffff80085d63f8 x6 : 0000000000000003 > [ 0.397997] x5 : 0000000000000054 x4 : ffffffc0031eb800 > [ 0.403499] x3 : ffffff800801b728 x2 : 0000000000000003 > [ 0.409000] x1 : 0000000000000054 x0 : 0000000000000000 > [ 0.414502] Process swapper/0 (pid: 1, stack limit = 0x000000002a913c1c) > [ 0.421441] Call trace: > [ 0.423968] mtk_hw_pin_field_get+0x28/0x118 > [ 0.428387] mtk_hw_set_value+0x30/0x104 > [ 0.432445] mtk_gpio_set+0x20/0x28 > [ 0.436052] mtk_gpio_direction_output+0x18/0x30 > [ 0.440833] gpiod_direction_output_raw_commit+0x7c/0xa0 > [ 0.446333] gpiod_direction_output+0x104/0x114 > [ 0.451022] gpiod_configure_flags+0xbc/0xfc > [ 0.455441] gpiod_hog+0x8c/0x140 > [ 0.458869] of_gpiochip_add+0x27c/0x2d4 > [ 0.462928] gpiochip_add_data_with_key+0x338/0x5f0 > [ 0.467976] mtk_pinctrl_probe+0x388/0x400 > [ 0.472217] platform_drv_probe+0x58/0xa4 > [ 0.476365] driver_probe_device+0x204/0x44c > [ 0.480783] __device_attach_driver+0xac/0x108 > [ 0.485384] bus_for_each_drv+0x7c/0xac > [ 0.489352] __device_attach+0xa0/0x144 > [ 0.493320] device_initial_probe+0x10/0x18 > [ 0.497647] bus_probe_device+0x2c/0x8c > [ 0.501616] device_add+0x2f8/0x540 > [ 0.505226] of_device_add+0x3c/0x44 > [ 0.508925] of_platform_device_create_pdata+0x80/0xb8 > [ 0.514245] of_platform_bus_create+0x290/0x3e8 > [ 0.518933] of_platform_populate+0x78/0x100 > [ 0.523352] of_platform_default_populate+0x24/0x2c > [ 0.528403] of_platform_default_populate_init+0x94/0xa4 > [ 0.533903] do_one_initcall+0x98/0x130 > [ 0.537874] kernel_init_freeable+0x13c/0x1d4 > [ 0.542385] kernel_init+0x10/0xf8 > [ 0.545903] ret_from_fork+0x10/0x18 > [ 0.549603] Code: 900020a1 f9400800 911dcc21 1400001f (f9406401) > [ 0.555916] ---[ end trace de8c34787fdad3b3 ]--- > [ 0.560722] Kernel panic - not syncing: Attempted to kill init! > exitcode=0x0000000b > [ 0.560722] > [ 0.570188] SMP: stopping secondary CPUs > [ 0.574253] ---[ end Kernel panic - not syncing: Attempted to kill > init! exitcode=0x0000000b > [ 0.574253] > > Cc: stable@vger.kernel.org > Fixes: d6ed93551320 ("pinctrl: mediatek: add pinctrl driver for MT7622 SoC") > Signed-off-by: Sean Wang <sean.wang@mediatek.com> Patch applied for fixes. Yours, Linus Walleij
diff --git a/drivers/pinctrl/mediatek/pinctrl-mt7622.c b/drivers/pinctrl/mediatek/pinctrl-mt7622.c index 055074bb..4c4740f 100644 --- a/drivers/pinctrl/mediatek/pinctrl-mt7622.c +++ b/drivers/pinctrl/mediatek/pinctrl-mt7622.c @@ -1424,7 +1424,7 @@ static struct pinctrl_desc mtk_desc = { static int mtk_gpio_get(struct gpio_chip *chip, unsigned int gpio) { - struct mtk_pinctrl *hw = dev_get_drvdata(chip->parent); + struct mtk_pinctrl *hw = gpiochip_get_data(chip); int value, err; err = mtk_hw_get_value(hw, gpio, PINCTRL_PIN_REG_DI, &value); @@ -1436,7 +1436,7 @@ static int mtk_gpio_get(struct gpio_chip *chip, unsigned int gpio) static void mtk_gpio_set(struct gpio_chip *chip, unsigned int gpio, int value) { - struct mtk_pinctrl *hw = dev_get_drvdata(chip->parent); + struct mtk_pinctrl *hw = gpiochip_get_data(chip); mtk_hw_set_value(hw, gpio, PINCTRL_PIN_REG_DO, !!value); }