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| author | Ramona Bolboaca <ramona.bolboaca@analog.com> | 2022-11-22 11:27:49 +0300 |
|---|---|---|
| committer | Jonathan Cameron <Jonathan.Cameron@huawei.com> | 2022-11-23 23:37:50 +0300 |
| commit | 99c05e4283a19a02a256f14100ca4ec3b2da3f62 (patch) | |
| tree | 83ddb65046e85f82a06029f10fdca2e501eb2d63 /include/linux/iio | |
| parent | 99b43a15915543484d7538cb32f49901e802628a (diff) | |
| download | linux-99c05e4283a19a02a256f14100ca4ec3b2da3f62.tar.xz | |
iio: adis: add '__adis_enable_irq()' implementation
Add '__adis_enable_irq()' implementation which is the unlocked
version of 'adis_enable_irq()'.
Call '__adis_enable_irq()' instead of 'adis_enable_irq()' from
'__adis_intial_startup()' to keep the expected unlocked functionality.
This fix is needed to remove a deadlock for all devices which are
using 'adis_initial_startup()'. The deadlock occurs because the
same mutex is acquired twice, without releasing it.
The mutex is acquired once inside 'adis_initial_startup()', before
calling '__adis_initial_startup()', and once inside
'adis_enable_irq()', which is called by '__adis_initial_startup()'.
The deadlock is removed by calling '__adis_enable_irq()', instead of
'adis_enable_irq()' from within '__adis_initial_startup()'.
Fixes: b600bd7eb3335 ("iio: adis: do not disabe IRQs in 'adis_init()'")
Signed-off-by: Ramona Bolboaca <ramona.bolboaca@analog.com>
Reviewed-by: Nuno Sá <nuno.sa@analog.com>
Link: https://lore.kernel.org/r/20221122082757.449452-2-ramona.bolboaca@analog.com
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Diffstat (limited to 'include/linux/iio')
| -rw-r--r-- | include/linux/iio/imu/adis.h | 13 |
1 files changed, 12 insertions, 1 deletions
diff --git a/include/linux/iio/imu/adis.h b/include/linux/iio/imu/adis.h index 515ca09764fe..bcbefb757475 100644 --- a/include/linux/iio/imu/adis.h +++ b/include/linux/iio/imu/adis.h @@ -402,9 +402,20 @@ static inline int adis_update_bits_base(struct adis *adis, unsigned int reg, __adis_update_bits_base(adis, reg, mask, val, sizeof(val)); \ }) -int adis_enable_irq(struct adis *adis, bool enable); int __adis_check_status(struct adis *adis); int __adis_initial_startup(struct adis *adis); +int __adis_enable_irq(struct adis *adis, bool enable); + +static inline int adis_enable_irq(struct adis *adis, bool enable) +{ + int ret; + + mutex_lock(&adis->state_lock); + ret = __adis_enable_irq(adis, enable); + mutex_unlock(&adis->state_lock); + + return ret; +} static inline int adis_check_status(struct adis *adis) { |