mirror of
https://github.com/hathach/tinyusb.git
synced 2026-08-18 11:02:16 +00:00
a3ee0b4ff1
The SIE command protocol (CmdCode + CCEMPTY/CDFULL handshake), the slave-mode Ctrl/RxData/TxData window, the EpIntEn read-modify-writes, and set_ep_size's ReEp/EP_RLZED handshake are all shared between thread-mode API calls and dcd_int_handler, and none are reentrant: an ISR preempting a thread-mode sequence consumes its handshake flags or, in set_ep_size's case, a bus reset's DevIntClr = 0xFFFFFFFF eats the EP_RLZED flag the spin waits on, hanging it forever. Guard them by masking only the USB IRQ (nestable, ISR-safe; CMSIS NVIC_DisableIRQ already ends with DSB+ISB). control_xact keeps the mask across its in_isr=true event push, since osal_none skips queue locking for in_isr. Hardening, not a fix for an observed failure: the ea4088 usbtest 30/30 + HIL 14/14 results were reproduced with and without it. The windows are a few instructions wide and most exposed on RTOS builds where class drivers queue transfers from tasks concurrent with the USB IRQ.