From 99c05e4283a19a02a256f14100ca4ec3b2da3f62 Mon Sep 17 00:00:00 2001 From: Ramona Bolboaca Date: Tue, 22 Nov 2022 10:27:49 +0200 Subject: iio: adis: add '__adis_enable_irq()' implementation MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit 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 Reviewed-by: Nuno Sá Link: https://lore.kernel.org/r/20221122082757.449452-2-ramona.bolboaca@analog.com Signed-off-by: Jonathan Cameron --- include/linux/iio/imu/adis.h | 13 ++++++++++++- 1 file changed, 12 insertions(+), 1 deletion(-) (limited to 'include') 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) { -- cgit v1.2.3