We store UNDEF_REG in a u8. It causes a problem in functions like
stm32_tx_dma_complete() where we check "if (ofs->icr == UNDEF_REG)".
Fixes: 3489187204eb ('serial: stm32: adding dma support')
Signed-off-by: Dan Carpenter <dan.carpenter@xxxxxxxxxx>
diff --git a/drivers/tty/serial/stm32-usart.h b/drivers/tty/serial/stm32-usart.h
index 41d9749..f9887cc 100644
--- a/drivers/tty/serial/stm32-usart.h
+++ b/drivers/tty/serial/stm32-usart.h
@@ -31,7 +31,7 @@ struct stm32_usart_info {
struct stm32_usart_config cfg;
};
-#define UNDEF_REG ~0
+#define UNDEF_REG 0xFF
/* Register offsets */
struct stm32_usart_info stm32f4_info = {
--
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