linux/drivers/gpio
Bamvor Jian Zhang bd203bd56d gpiolib: fix crash when gpiochip removed
Commit cb464a88e1ed ("gpio: make the gpiochip a real device") call
gpiochip_sysfs_unregister after the gpiochip is empty. It lead to the
following crash:

[  163.503994] Unable to handle kernel NULL pointer dereference at virtual address 0000007c
[...]
[  163.525394] [<ffffffc0003719a0>] gpiochip_sysfs_unregister+0x44/0xa4
[  163.525611] [<ffffffc00036f6a0>] gpiochip_remove+0x24/0x154
[  163.525861] [<ffffffbffc00f0a4>] mockup_gpio_remove+0x38/0x64 [gpio_mockup]
[  163.526101] [<ffffffc00042b4b4>] platform_drv_remove+0x24/0x64
[  163.526313] [<ffffffc000429cc8>] __device_release_driver+0x7c/0xfc
[  163.526525] [<ffffffc000429e54>] driver_detach+0xbc/0xc0
[  163.526700] [<ffffffc000429014>] bus_remove_driver+0x58/0xac
[  163.526883] [<ffffffc00042a4cc>] driver_unregister+0x2c/0x4c
[  163.527067] [<ffffffc00042b5c0>] platform_driver_unregister+0x10/0x18
[  163.527284] [<ffffffbffc00f340>] mock_device_exit+0x10/0x38 [gpio_mockup]
[  163.527593] [<ffffffc00011cefc>] SyS_delete_module+0x1b8/0x1fc
[  163.527799] [<ffffffc000085d8c>] __sys_trace_return+0x0/0x4
[  163.528049] Code: 940d74b4 f9019abf aa1303e0 940d7439 (7940fac0)
[  163.536273] ---[ end trace 3d1329be504af609 ]---

This patch fix this by changing the code back.

Signed-off-by: Bamvor Jian Zhang <bamvor.zhangjian@linaro.org>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
2016-02-20 12:48:34 +01:00
..
devres.c gpio: make flags mandatory for gpiod_get functions 2015-07-06 10:39:24 +02:00
gpio-74x164.c gpio: 74x164: use gpiochip data pointer 2016-01-05 11:21:01 +01:00
gpio-74xx-mmio.c gpio: generic: factor into gpio_chip struct 2016-01-05 11:21:00 +01:00
gpio-104-dio-48e.c gpio: 104-dio-48e: Use devm_request_region 2016-02-16 00:19:51 +01:00
gpio-104-idi-48.c gpio: 104-idi-48: Use devm_request_region 2016-02-16 00:19:51 +01:00
gpio-104-idio-16.c gpio: 104-idio-16: Use devm_request_region 2016-02-16 00:19:52 +01:00
gpio-adnp.c gpio: adnp: use gpiochip data pointer 2016-01-05 11:21:01 +01:00
gpio-adp5520.c gpio: adp5520: use gpiochip data pointer 2016-01-05 11:21:02 +01:00
gpio-adp5588.c gpio: adp5588: use gpiochip data pointer 2016-01-05 11:21:02 +01:00
gpio-altera.c gpio: altera: use gpiochip data pointer 2016-01-05 11:21:02 +01:00
gpio-amd8111.c gpio: amd8111: Use devm_request_region 2016-02-16 00:19:52 +01:00
gpio-amdpt.c gpio: amdpt: use gpiochip data pointer 2016-01-05 11:21:02 +01:00
gpio-arizona.c GPIO bulk updates for the v4.5 kernel cycle: 2016-01-17 12:32:01 -08:00
gpio-ath79.c gpio: ath79: Update the copyright notice 2016-02-10 11:38:21 +01:00
gpio-bcm-kona.c gpio: bcm-kona: use gpiochip data pointer 2016-01-05 11:21:03 +01:00
gpio-brcmstb.c gpio: brcmstb: Set endian flags for big-endian MIPS 2016-01-07 16:25:09 +01:00
gpio-bt8xx.c gpio: bt8xx: use gpiochip data pointer 2016-01-05 11:21:03 +01:00
gpio-clps711x.c gpio: generic: factor into gpio_chip struct 2016-01-05 11:21:00 +01:00
gpio-crystalcove.c gpio: crystalcove: use gpiochip data pointer 2016-01-05 11:21:04 +01:00
gpio-cs5535.c gpio: cs5535: use gpiochip data pointer 2016-01-05 11:21:04 +01:00
gpio-da9052.c gpio: da9052: use gpiochip data pointer 2016-01-05 11:21:04 +01:00
gpio-da9055.c gpio: da9055: use gpiochip data pointer 2016-01-05 11:21:04 +01:00
gpio-davinci.c gpio: davinci: Fix possible NULL pointer deference 2016-02-16 00:20:04 +01:00
gpio-dln2.c gpio: dln2: use gpiochip data pointer 2016-01-05 11:21:05 +01:00
gpio-dwapb.c gpio: generic: factor into gpio_chip struct 2016-01-05 11:21:00 +01:00
gpio-em.c gpio: em: use gpiochip data pointer 2016-01-05 11:21:05 +01:00
gpio-ep93xx.c gpio: generic: factor into gpio_chip struct 2016-01-05 11:21:00 +01:00
gpio-etraxfs.c gpio: generic: factor into gpio_chip struct 2016-01-05 11:21:00 +01:00
gpio-f7188x.c gpio-f7188x: Add F81866 GPIO supports 2016-01-28 10:06:12 +01:00
gpio-ge.c gpio: generic: factor into gpio_chip struct 2016-01-05 11:21:00 +01:00
gpio-generic.c gpio: generic: factor into gpio_chip struct 2016-01-05 11:21:00 +01:00
gpio-grgpio.c gpio: generic: factor into gpio_chip struct 2016-01-05 11:21:00 +01:00
gpio-ich.c gpio: ich: Use devm_request_region 2016-02-16 00:19:53 +01:00
gpio-intel-mid.c gpio: intel-mid: use gpiochip data pointer 2016-01-05 11:21:05 +01:00
gpio-iop.c gpio: convert remaining users to gpiochip_add_data() 2016-01-05 11:21:20 +01:00
gpio-it87.c gpio: it87: use gpiochip data pointer 2016-01-05 11:21:06 +01:00
gpio-janz-ttl.c gpio: convert remaining users to gpiochip_add_data() 2016-01-05 11:21:20 +01:00
gpio-kempld.c gpio: kempld: use gpiochip data pointer 2016-01-05 11:21:06 +01:00
gpio-ks8695.c gpio: ks8695: remove irq_to_gpio function 2016-02-19 00:20:30 +01:00
gpio-loongson.c gpio: convert remaining users to gpiochip_add_data() 2016-01-05 11:21:20 +01:00
gpio-lp3943.c gpio: lp3943: use gpiochip data pointer 2016-01-05 11:21:06 +01:00
gpio-lpc18xx.c gpio: lpc18xx: use gpiochip data pointer 2016-01-05 11:21:06 +01:00
gpio-lpc32xx.c gpio: lpc32xx: use gpiochip data pointer 2016-01-05 11:21:06 +01:00
gpio-lynxpoint.c gpio: lynxpoint: use gpiochip data pointer 2016-01-05 11:21:07 +01:00
gpio-max730x.c gpio: max730x: use gpiochip data pointer 2016-01-05 11:21:07 +01:00
gpio-max732x.c gpio: max732x: use gpiochip data pointer 2016-01-05 11:21:07 +01:00
gpio-max7300.c gpio: Drop owner assignment from i2c_driver 2015-11-30 09:31:00 +01:00
gpio-max7301.c spi: Drop owner assignment from spi_drivers 2015-10-28 10:30:17 +09:00
gpio-mb86s7x.c gpio: mb86s7x: use gpiochip data pointer 2016-01-05 11:21:07 +01:00
gpio-mc9s08dz60.c gpio: mc9s08dz60: use gpiochip data pointer 2016-01-05 11:21:08 +01:00
gpio-mc33880.c gpio: mc33880: use gpiochip data pointer 2016-01-05 11:21:07 +01:00
gpio-mcp23s08.c gpio-mcp23s08: correctly handling failed allocation 2016-02-16 16:36:22 +01:00
gpio-ml-ioh.c gpio: ml-ioh: use gpiochip data pointer 2016-01-05 11:21:08 +01:00
gpio-mm-lantiq.c gpio: mm-lantiq: Do not use gpiochip_get_data() in ltq_mm_save_regs() 2016-01-13 10:21:06 +01:00
gpio-moxart.c gpio: moxart: fix build regression 2016-01-07 16:16:38 +01:00
gpio-mpc8xxx.c drivers/gpio: Switch gpio-mpc8xxx to use gpio-generic 2016-02-08 18:32:58 +01:00
gpio-mpc5200.c gpio: Include linux/gpio.h instead of asm/gpio.h 2016-02-16 00:20:03 +01:00
gpio-msic.c gpio: msic: use gpiochip data pointer 2016-01-05 11:21:09 +01:00
gpio-mvebu.c gpio: mvebu: use gpiochip data pointer 2016-01-05 11:21:09 +01:00
gpio-mxc.c gpio: generic: factor into gpio_chip struct 2016-01-05 11:21:00 +01:00
gpio-mxs.c gpio: generic: factor into gpio_chip struct 2016-01-05 11:21:00 +01:00
gpio-octeon.c gpio: octeon: use gpiochip data pointer 2016-01-05 11:21:10 +01:00
gpio-omap.c gpio: omap: use gpiochip data pointer 2016-01-05 11:21:10 +01:00
gpio-palmas.c gpio: palmas: use gpiochip data pointer 2016-01-05 11:21:10 +01:00
gpio-pca953x.c gpio: pca953x: use gpiochip data pointer 2016-01-05 11:21:11 +01:00
gpio-pcf857x.c gpio: pcf857x: use gpiochip data pointer 2016-01-05 11:21:11 +01:00
gpio-pch.c gpio: pch: Optimize pch_gpio_get() 2016-01-05 15:46:34 +01:00
gpio-pisosr.c gpio: pisosr: add missing unlock 2016-02-19 12:56:13 +01:00
gpio-pl061.c gpio: pl061: use gpiochip data pointer 2016-01-05 11:21:11 +01:00
gpio-pxa.c gpio: pxa: use gpiochip data pointer 2016-01-05 11:21:12 +01:00
gpio-rc5t583.c gpio: rc5t583: use gpiochip data pointer 2016-01-05 11:21:12 +01:00
gpio-rcar.c gpio: rcar: use gpiochip data pointer 2016-01-05 11:21:12 +01:00
gpio-rdc321x.c gpio: rdc321x: use gpiochip data pointer 2016-01-05 11:21:12 +01:00
gpio-sa1100.c gpio: convert remaining users to gpiochip_add_data() 2016-01-05 11:21:20 +01:00
gpio-sch311x.c gpio: sch311x: Use devm_request_region 2016-02-16 00:19:53 +01:00
gpio-sch.c gpio: sch: use gpiochip data pointer 2016-01-05 11:21:13 +01:00
gpio-sodaville.c gpio: generic: factor into gpio_chip struct 2016-01-05 11:21:00 +01:00
gpio-spear-spics.c gpio: spear-spics: use gpiochip data pointer 2016-01-05 11:21:13 +01:00
gpio-sta2x11.c gpio: sta2x11: use gpiochip data pointer 2016-01-05 11:21:13 +01:00
gpio-stmpe.c gpio: stmpe: use gpiochip data pointer 2016-01-05 11:21:14 +01:00
gpio-stp-xway.c gpio: stp-xway: use gpiochip data pointer 2016-01-05 11:21:14 +01:00
gpio-sx150x.c gpio: sx150x: use gpiochip data pointer 2016-01-05 11:21:14 +01:00
gpio-syscon.c gpio: syscon: use gpiochip data pointer 2016-01-05 11:21:14 +01:00
gpio-tb10x.c gpio: tb10x: use gpiochip data pointer 2016-01-05 11:21:15 +01:00
gpio-tc3589x.c gpio: tc3589x: use gpiochip data pointer 2016-01-05 11:21:15 +01:00
gpio-tegra.c gpio: convert remaining users to gpiochip_add_data() 2016-01-05 11:21:20 +01:00
gpio-timberdale.c gpio: timberdale: use gpiochip data pointer 2016-01-05 11:21:15 +01:00
gpio-tpic2810.c gpio: tpic2810: Make tpic2810_direction_output set proper output level 2016-02-16 15:56:51 +01:00
gpio-tps6586x.c gpio: tps6586x: use gpiochip data pointer 2016-01-05 11:21:15 +01:00
gpio-tps65218.c gpio: tps65218: remove unused #include 2016-02-19 09:22:41 +01:00
gpio-tps65910.c gpio: tps65910: use gpiochip data pointer 2016-01-05 11:21:15 +01:00
gpio-tps65912.c gpio: tps65912: use gpiochip data pointer 2016-01-05 11:21:16 +01:00
gpio-ts4800.c gpio: TS-4800: remove useless bgpio_init flags 2016-02-16 00:20:03 +01:00
gpio-ts5500.c gpio: ts5500: use gpiochip data pointer 2016-01-05 11:21:16 +01:00
gpio-twl4030.c gpio: twl4030: use gpiochip data pointer 2016-01-05 11:21:16 +01:00
gpio-twl6040.c gpio: convert remaining users to gpiochip_add_data() 2016-01-05 11:21:20 +01:00
gpio-tz1090-pdc.c gpio: tz1090-pdc: use gpiochip data pointer 2016-01-05 11:21:16 +01:00
gpio-tz1090.c gpio: tz1090: use gpiochip data pointer 2016-01-05 11:21:16 +01:00
gpio-ucb1400.c gpio: ucb1400: use gpiochip data pointer 2016-01-05 11:21:17 +01:00
gpio-vf610.c gpio: vf610: use gpiochip data pointer 2016-01-05 11:21:17 +01:00
gpio-viperboard.c gpio: viperboard: use gpiochip data pointer 2016-01-05 11:21:17 +01:00
gpio-vr41xx.c gpio: convert remaining users to gpiochip_add_data() 2016-01-05 11:21:20 +01:00
gpio-vx855.c gpio: vx855: use gpiochip data pointer 2016-01-05 11:21:18 +01:00
gpio-wm831x.c gpio: wm831x: use gpiochip data pointer 2016-01-05 11:21:18 +01:00
gpio-wm8350.c gpio: wm8350: use gpiochip data pointer 2016-01-05 11:21:18 +01:00
gpio-wm8994.c gpio: wm8994: use gpiochip data pointer 2016-01-05 11:21:18 +01:00
gpio-ws16c48.c gpio: ws16c48: Use devm_request_region 2016-02-16 00:19:54 +01:00
gpio-xgene-sb.c gpio: xgene: Enable X-Gene standby GPIO as interrupt controller 2016-02-19 10:10:41 +01:00
gpio-xgene.c gpio: xgene: use gpiochip data pointer 2016-01-05 11:21:19 +01:00
gpio-xilinx.c gpio: xilinx: Do not use gpiochip_get_data() in xgpio_save_regs() 2016-01-07 10:06:56 +01:00
gpio-xlp.c gpio: xlp: use gpiochip data pointer 2016-01-05 11:21:19 +01:00
gpio-xtensa.c gpio: convert remaining users to gpiochip_add_data() 2016-01-05 11:21:20 +01:00
gpio-zevio.c gpio: zevio: use gpiochip data pointer 2016-01-05 11:21:19 +01:00
gpio-zx.c gpio: zx: use gpiochip data pointer 2016-01-05 11:21:19 +01:00
gpio-zynq.c gpio: zynq: use gpiochip data pointer 2016-01-05 11:21:20 +01:00
gpiolib-acpi.c gpio: move the pin ranges into gpio_device 2016-02-16 00:20:02 +01:00
gpiolib-legacy.c gpiolib: Split GPIO flags parsing and GPIO configuration 2015-10-16 22:46:46 +02:00
gpiolib-of.c gpio: of: provide optional of_mm_gpiochip_add_data() function 2016-01-05 11:20:12 +01:00
gpiolib-sysfs.c gpio: reflect base and ngpio into gpio_device 2016-02-11 20:29:46 +01:00
gpiolib.c gpiolib: fix crash when gpiochip removed 2016-02-20 12:48:34 +01:00
gpiolib.h gpio: store reflect the label to userspace 2016-02-19 09:48:41 +01:00
Kconfig gpio: add tps65218 gpio 2016-02-11 12:25:16 +01:00
Makefile gpio: add tps65218 gpio 2016-02-11 12:25:16 +01:00