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--- ax99100_sp.c
+++ ax99100_sp.c
@@ -2670,8 +2670,10 @@ static void serial99100_dma_tx_tasklet (unsigned long param)
#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,37)
static DECLARE_MUTEX(serial99100_sem);
-#else
+#elif LINUX_VERSION_CODE < KERNEL_VERSION(6,4,0)
static DEFINE_SEMAPHORE(serial99100_sem);
+#else
+static DEFINE_SEMAPHORE(serial99100_sem, 1);
#endif
static struct uart_driver starex_serial_driver = {
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