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2024-05-10 37f49e37ab4cb5d0bc4c60eb5c6d4dd57db767bb

 kernel/drivers/soc/rockchip/fiq_debugger/rk_fiq_debugger.c
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@@ -179,11 +179,13 @@
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 	if (lsr & UART_LSR_DR) {
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 		temp = rk_fiq_read(t, UART_RX);
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-		buf[n & 0x1f] = temp;
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-		n++;
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-		if (temp == 'q' && n > 2) {
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-			if ((buf[(n - 2) & 0x1f] == 'i') &&
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-			    (buf[(n - 3) & 0x1f] == 'f'))
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+		buf[++n & 0x1f] = temp;
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+
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+		if (temp == 'q') {
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+			if ((buf[(n - 1) & 0x1f] == 'i') &&
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+			    (buf[(n - 2) & 0x1f] == 'f') &&
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+			    (buf[(n - 3) & 0x1f] != '_') &&
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+			    (buf[(n - 3) & 0x1f] != ' '))
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 				return FIQ_DEBUGGER_BREAK;
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 			else
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 				return temp;
..
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@@ -334,7 +336,7 @@
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 		unsigned int dropped;
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 		set_current_state(TASK_INTERRUPTIBLE);
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-		if (kfifo_is_empty(&fifo) && kfifo_is_empty(&tty_fifo)) {
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+		if (console_thread_stop || (kfifo_is_empty(&fifo) && kfifo_is_empty(&tty_fifo))) {
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 			smp_store_mb(console_thread_running, false);
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 			schedule();
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 			smp_store_mb(console_thread_running, true);
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@@ -344,13 +346,13 @@
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 		set_current_state(TASK_RUNNING);
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 		while (!console_thread_stop && (!kfifo_is_empty(&fifo) || !kfifo_is_empty(&tty_fifo))) {
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-			while (kfifo_get(&fifo, &c)) {
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+			while (!console_thread_stop && kfifo_get(&fifo, &c)) {
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 				console_put(pdev, &c, 1);
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 				if (c == '\n')
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 					break;
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 			}
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-			while (kfifo_get(&tty_fifo, &c)) {
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+			while (!console_thread_stop && kfifo_get(&tty_fifo, &c)) {
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 				console_putc(pdev, c);
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 				len_tty++;
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 				if (c == '\n')
..
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@@ -418,6 +420,8 @@
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 	unsigned int ret = 0;
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 	struct rk_fiq_debugger *t;
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+	if (console_thread_stop)
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+		return count;
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 	t = container_of(dev_get_platdata(&pdev->dev), typeof(*t), pdata);
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 	if (count > 0) {
..
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@@ -759,6 +763,11 @@
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 	if ((sip_fiq_debugger_is_enabled()) &&
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 	    (sip_fiq_debugger_get_target_cpu() == cpu)) {
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 		target_cpu = cpumask_any_but(cpu_online_mask, cpu);
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+		if (target_cpu >= nr_cpu_ids) {
767
+			pr_err("%s: migrate fiq fail!\n", __func__);
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+			return -EBUSY;
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+		}
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+
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 		sip_fiq_debugger_switch_cpu(target_cpu);
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 	}
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