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-rw-r--r--include/linux/serial.h2
1 files changed, 1 insertions, 1 deletions
diff --git a/include/linux/serial.h b/include/linux/serial.h
index c8613c3ff9d3..c3b45add494d 100644
--- a/include/linux/serial.h
+++ b/include/linux/serial.h
@@ -151,7 +151,7 @@ struct serial_uart_config {
#define ASYNC_BUGGY_UART (1U << ASYNCB_BUGGY_UART)
#define ASYNC_AUTOPROBE (1U << ASYNCB_AUTOPROBE)
-#define ASYNC_FLAGS ((1U << ASYNCB_LAST_USER) - 1)
+#define ASYNC_FLAGS ((1U << (ASYNCB_LAST_USER + 1)) - 1)
#define ASYNC_USR_MASK (ASYNC_SPD_HI|ASYNC_SPD_VHI| \
ASYNC_CALLOUT_NOHUP|ASYNC_SPD_SHI|ASYNC_LOW_LATENCY)
#define ASYNC_SPD_CUST (ASYNC_SPD_HI|ASYNC_SPD_VHI)