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linux-stable/drivers/iio/magnetometer
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Krzysztof Kozlowski 07d2390e36 iio: ak8975: Fix NULL pointer exception on early interrupt 
In certain probe conditions the interrupt came right after registering
the handler causing a NULL pointer exception because of uninitialized
waitqueue:

$ udevadm trigger
i2c-gpio i2c-gpio-1: using pins 143 (SDA) and 144 (SCL)
i2c-gpio i2c-gpio-3: using pins 53 (SDA) and 52 (SCL)
Unable to handle kernel NULL pointer dereference at virtual address 00000000
pgd = e8b38000
[00000000] *pgd=00000000
Internal error: Oops: 5 [#1] SMP ARM
Modules linked in: snd_soc_i2s(+) i2c_gpio(+) snd_soc_idma snd_soc_s3c_dma snd_soc_core snd_pcm_dmaengine snd_pcm snd_timer snd soundcore ac97_bus spi_s3c64xx pwm_samsung dwc2 exynos_adc phy_exynos_usb2 exynosdrm exynos_rng rng_core rtc_s3c
CPU: 0 PID: 717 Comm: data-provider-m Not tainted 4.6.0-rc1-next-20160401-00011-g1b8d87473b9e-dirty #101
Hardware name: SAMSUNG EXYNOS (Flattened Device Tree)
(...)
(__wake_up_common) from [<c0379624>] (__wake_up+0x38/0x4c)
(__wake_up) from [<c0a41d30>] (ak8975_irq_handler+0x28/0x30)
(ak8975_irq_handler) from [<c0386720>] (handle_irq_event_percpu+0x88/0x140)
(handle_irq_event_percpu) from [<c038681c>] (handle_irq_event+0x44/0x68)
(handle_irq_event) from [<c0389c40>] (handle_edge_irq+0xf0/0x19c)
(handle_edge_irq) from [<c0385e04>] (generic_handle_irq+0x24/0x34)
(generic_handle_irq) from [<c05ee360>] (exynos_eint_gpio_irq+0x50/0x68)
(exynos_eint_gpio_irq) from [<c0386720>] (handle_irq_event_percpu+0x88/0x140)
(handle_irq_event_percpu) from [<c038681c>] (handle_irq_event+0x44/0x68)
(handle_irq_event) from [<c0389a70>] (handle_fasteoi_irq+0xb4/0x194)
(handle_fasteoi_irq) from [<c0385e04>] (generic_handle_irq+0x24/0x34)
(generic_handle_irq) from [<c03860b4>] (__handle_domain_irq+0x5c/0xb4)
(__handle_domain_irq) from [<c0301774>] (gic_handle_irq+0x54/0x94)
(gic_handle_irq) from [<c030c910>] (__irq_usr+0x50/0x80)

The bug was reproduced on exynos4412-trats2 (with a max77693 device also
using i2c-gpio) after building max77693 as a module.

Cc: <stable@vger.kernel.org>
Fixes: 94a6d5cf7c ("iio:ak8975 Implement data ready interrupt handling")
Signed-off-by: Krzysztof Kozlowski <k.kozlowski@samsung.com>
Tested-by: Gregor Boirie <gregor.boirie@parrot.com>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>
2016-04-17 12:16:36 +01:00
..
ak8975.c iio: ak8975: Fix NULL pointer exception on early interrupt 2016-04-17 12:16:36 +01:00
bmc150_magn.c iio: Reconcile operation order between iio_register/unregister and pm functions 2015-11-08 15:36:53 +00:00
hid-sensor-magn-3d.c iio: hid-sensor-magn-3d: Constify platform_device_id 2015-05-10 20:31:47 +01:00
hmc5843.h iio: hmc5843: Move hmc5843 out of staging 2016-02-24 20:40:39 +00:00
hmc5843_core.c iio: hmc5843: Move hmc5843 out of staging 2016-02-24 20:40:39 +00:00
hmc5843_i2c.c iio: hmc5843: Move hmc5843 out of staging 2016-02-24 20:40:39 +00:00
hmc5843_spi.c iio: hmc5843: Move hmc5843 out of staging 2016-02-24 20:40:39 +00:00
Kconfig iio: hmc5843: Move hmc5843 out of staging 2016-02-24 20:40:39 +00:00
mag3110.c
Makefile iio: hmc5843: Move hmc5843 out of staging 2016-02-24 20:40:39 +00:00
mmc35240.c Second set of new device support, features and cleanup for the 4.3 cycle. 2015-08-12 12:43:41 -07:00
st_magn.h iio: st_magn: always define ST_MAGN_TRIGGER_SET_STATE 2016-04-03 10:56:42 +01:00
st_magn_buffer.c iio: st_magn: Add irq trigger handling 2015-07-23 20:43:13 +01:00
st_magn_core.c iio: st_sensors: support active-low interrupts 2016-01-10 12:35:32 +00:00
st_magn_i2c.c iio: st-magn: add support for lsm303agr magnetometer 2015-07-23 20:43:27 +01:00
st_magn_spi.c spi: Drop owner assignment from spi_drivers 2015-10-28 10:30:17 +09:00