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Merge branch 'fix/freertos_race_cond_in_stream_buffers_v5.3' into 'release/v5.3'

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fix(freertos): Fixed SMP race condition in stream_buffers.c (v5.3)

See merge request espressif/esp-idf!34223
This commit is contained in:
Marius Vikhammer 2024-10-22 15:59:18 +08:00
commit 18d997805a
2 changed files with 16 additions and 2 deletions
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2
components/freertos/FreeRTOS-Kernel/idf_changes.md
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@ -123,6 +123,8 @@ The following functions were modified to accommodate SMP behavior:
- In SMP, the function now disables interrupts to ensure that the calling task does not switch cores while checking its own copy of `uxSchedulerSuspended`.
- `prvAddCurrentTaskToDelayedList()`
- Added extra check to see if current blocking task has already been deleted by the other core.
- `xStreamBufferReceive()`
- Added a critical section for setting `xTaskWaitingToReceive` to `NULL` so that the write is SMP safe.
### Critical Section Changes

16
components/freertos/FreeRTOS-Kernel/stream_buffer.c
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@ -6,7 +6,7 @@
*
* SPDX-License-Identifier: MIT
*
* SPDX-FileContributor: 2023 Espressif Systems (Shanghai) CO LTD
* SPDX-FileContributor: 2023-2024 Espressif Systems (Shanghai) CO LTD
*
* Permission is hereby granted, free of charge, to any person obtaining a copy of
* this software and associated documentation files (the "Software"), to deal in
@ -976,7 +976,19 @@ size_t xStreamBufferReceive( StreamBufferHandle_t xStreamBuffer,
/* Wait for data to be available. */
traceBLOCKING_ON_STREAM_BUFFER_RECEIVE( xStreamBuffer );
( void ) xTaskNotifyWait( ( uint32_t ) 0, ( uint32_t ) 0, NULL, xTicksToWait );
pxStreamBuffer->xTaskWaitingToReceive = NULL;
/* In SMP mode, the task may have been woken and scheduled on
* another core. Hence, we must clear the xTaskWaitingToReceive
* handle in a critical section. */
#if ( configNUMBER_OF_CORES > 1 )
taskENTER_CRITICAL( &( pxStreamBuffer->xStreamBufferLock ) );
#endif /* configNUMBER_OF_CORES > 1 */
{
pxStreamBuffer->xTaskWaitingToReceive = NULL;
}
#if ( configNUMBER_OF_CORES > 1 )
taskEXIT_CRITICAL( &( pxStreamBuffer->xStreamBufferLock ) );
#endif /* configNUMBER_OF_CORES > 1 */
/* Recheck the data available after blocking. */
xBytesAvailable = prvBytesInBuffer( pxStreamBuffer );