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firmware: protect uart_tx_queue against ISR

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cardem:
- dispatch_usb_command_cardem() appends to uart_tx_queue from the main loop
- tx_byte_tpdu() dequeues from the USART IRQ handler @ NVIC prio 0

card_handle_reset() has the same issue, drains queue and
frees uart_tx_msg from main loop while the ISR may own them.

All of this needs protection against the irq.

Needs a fixed llist_add_tail_irqsafe(), which called __enable_irq() instead of
restoring the saved PRIMASK for some unknown reason?!?!?!?

Change-Id: I7d9cdcc56263b27dfd4649dfb1da1d67761ee923
This commit is contained in:
Eric Wild authored and lynxis lazus committed 2026-08-10 16:13:59 +00:00
1 parent b36adff672
commit f7170aff42
3 files changed
+21 -8
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firmware/libcommon/include/llist_irqsafe.h
+1 -1
View File
@@ -34,7 +34,7 @@ static inline void llist_add_tail_irqsafe(struct llist_head *_new,
local_irq_save(x);
llist_add_tail(_new, head);
__enable_irq();
local_irq_restore(x);
}
static inline struct llist_head *llist_head_dequeue_irqsafe(struct llist_head *head)