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drivers: bluetooth: hci: Increase default RX stack size

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The `BT_DRV_RX_STACK_SIZE` config is used by HCI drivers to determine a
suitable stack size for their RX thread. These threads handle the HCI
transport and pass HCI messages to the Bluetooth host via `bt_hci_recv()`.
Previously, the default stack size was 256 bytes, but it seems to be too
small currently.

Measuring the peak stack usage of `bt_hci_recv()` in different scenarios
indicates that the function needs over 300 bytes of stack. Thus, an RX
thread stack size of 512 should cover that and leave some margin.

Signed-off-by: Kalle Kietäväinen <kalle.kietavainen@silabs.com>
This commit is contained in:
Kalle Kietäväinen 2025-01-21 15:41:25 +02:00 • committed by Benjamin Cabé
commit fa9126f5e8
1 changed files with 1 additions and 1 deletions
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drivers/bluetooth/hci/Kconfig
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@ -295,7 +295,7 @@ config BT_DRV_RX_STACK_SIZE
default BT_RX_STACK_SIZE if (BT_H4 || BT_HCI_RAW_H4)
default BT_STM32_IPM_RX_STACK_SIZE if BT_STM32_IPM
default HCI_NXP_RX_STACK_SIZE if HCI_NXP_RX_THREAD
default 256
default 512
help
Stack size for the HCI driver's RX thread.