diff options
| -rw-r--r-- | chip/stm32/bkpdata.c | 7 |
1 files changed, 5 insertions, 2 deletions
diff --git a/chip/stm32/bkpdata.c b/chip/stm32/bkpdata.c index 2b26ace7ea..bb1a7a5de3 100644 --- a/chip/stm32/bkpdata.c +++ b/chip/stm32/bkpdata.c @@ -24,6 +24,7 @@ uint16_t bkpdata_read(enum bkpdata_index index) int bkpdata_write(enum bkpdata_index index, uint16_t value) { static struct mutex bkpdata_write_mutex; + int use_mutex = !in_interrupt_context(); if (index < 0 || index >= STM32_BKP_ENTRIES) return EC_ERROR_INVAL; @@ -32,7 +33,8 @@ int bkpdata_write(enum bkpdata_index index, uint16_t value) * Two entries share a single 32-bit register, lock mutex to prevent * read/mask/write races. */ - mutex_lock(&bkpdata_write_mutex); + if (use_mutex) + mutex_lock(&bkpdata_write_mutex); if (index & 1) { uint32_t val = STM32_BKP_DATA(index >> 1); val = (val & 0x0000FFFF) | (value << 16); @@ -42,7 +44,8 @@ int bkpdata_write(enum bkpdata_index index, uint16_t value) val = (val & 0xFFFF0000) | value; STM32_BKP_DATA(index >> 1) = val; } - mutex_unlock(&bkpdata_write_mutex); + if (use_mutex) + mutex_unlock(&bkpdata_write_mutex); return EC_SUCCESS; } |