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host: fix enumerate racing

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- if a previous enumeration failed _ctrl_xfer status could stuck, it needs to be cleared before next attempt.
- after _dev0.enumerating is reset in hcd_event_handler(), if an attach event arrived before _ctrl_xfer clean up in remove event, a racing condition will happen.

Signed-off-by: HiFiPhile <admin@hifiphile.com>
This commit is contained in:
HiFiPhile 2025-04-12 20:00:00 +02:00 committed by hathach
parent 18d7a993be
commit 9f096ac56b
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GPG Key ID: 26FAB84F615C3C52
1 changed files with 13 additions and 5 deletions
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18
src/host/usbh.c
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@ -311,6 +311,12 @@ TU_ATTR_ALWAYS_INLINE static inline usbh_device_t* get_device(uint8_t dev_addr)
return &_usbh_devices[dev_addr-1];
}
TU_ATTR_ALWAYS_INLINE static inline void _set_control_xfer_stage(uint8_t stage) {
(void) osal_mutex_lock(_usbh_mutex, OSAL_TIMEOUT_WAIT_FOREVER);
_ctrl_xfer.stage = stage;
(void) osal_mutex_unlock(_usbh_mutex);
}
static bool enum_new_device(hcd_event_t* event);
static void process_removing_device(uint8_t rhport, uint8_t hub_addr, uint8_t hub_port);
static bool usbh_edpt_control_open(uint8_t dev_addr, uint8_t max_packet_size);
@ -557,6 +563,13 @@ void tuh_task_ext(uint32_t timeout_ms, bool in_isr) {
TU_LOG_USBH("[%u:%u:%u] USBH DEVICE REMOVED\r\n", event.rhport, event.connection.hub_addr, event.connection.hub_port);
process_removing_device(event.rhport, event.connection.hub_addr, event.connection.hub_port);
if ((event.rhport == _dev0.rhport) && (event.connection.hub_addr == _dev0.hub_addr) &&
(event.connection.hub_port == _dev0.hub_port)) {
_dev0.enumerating = 0;
if (_ctrl_xfer.daddr == 0) {
_set_control_xfer_stage(CONTROL_STAGE_IDLE);
}
}
#if CFG_TUH_HUB
// TODO remove
if (event.connection.hub_addr != 0 && event.connection.hub_port != 0) {
@ -1042,11 +1055,6 @@ TU_ATTR_FAST_FUNC void hcd_event_handler(hcd_event_t const* event, bool in_isr)
// FIXME device remove from a hub need an HCD API for hcd to free up endpoint
// mark device as removing to prevent further xfer before the event is processed in usbh task
// Check if dev0 is removed
if ((event->rhport == _dev0.rhport) && (event->connection.hub_addr == _dev0.hub_addr) &&
(event->connection.hub_port == _dev0.hub_port)) {
_dev0.enumerating = 0;
}
break;
default: break;