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spi_flash: raise priority of the task performing spi_flash operation

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Fixes https://github.com/espressif/arduino-esp32/issues/740
This commit is contained in:
Ivan Grokhotkov 2017-10-30 18:53:39 +08:00
parent 5340abcc7d
commit 1635b4a059
1 changed files with 7 additions and 0 deletions
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7
components/spi_flash/cache_utils.c
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@ -110,6 +110,11 @@ void IRAM_ATTR spi_flash_disable_interrupts_caches_and_other_cpu()
assert(other_cpuid == 1);
spi_flash_disable_cache(other_cpuid, &s_flash_op_cache_state[other_cpuid]);
} else {
// Temporarily raise current task priority to prevent a deadlock while
// waiting for IPC task to start on the other CPU
TaskHandle_t self = xTaskGetCurrentTaskHandle();
int old_prio = uxTaskPriorityGet(self);
vTaskPrioritySet(self, configMAX_PRIORITIES - 1);
// Signal to the spi_flash_op_block_task on the other CPU that we need it to
// disable cache there and block other tasks from executing.
s_flash_op_can_start = false;
@ -121,6 +126,8 @@ void IRAM_ATTR spi_flash_disable_interrupts_caches_and_other_cpu()
}
// Disable scheduler on the current CPU
vTaskSuspendAll();
// Can now set the priority back to the normal one
vTaskPrioritySet(self, old_prio);
// This is guaranteed to run on CPU <cpuid> because the other CPU is now
// occupied by highest priority task
assert(xPortGetCoreID() == cpuid);