From mboxrd@z Thu Jan 1 00:00:00 1970 From: geert@linux-m68k.org (Geert Uytterhoeven) Date: Thu, 6 Oct 2016 15:42:54 +0200 Subject: [PATCH] serial: stm32: Fix comparisons with undefined register Message-ID: <1475761374-13576-1-git-send-email-geert@linux-m68k.org> To: linux-arm-kernel@lists.infradead.org List-Id: linux-arm-kernel.lists.infradead.org drivers/tty/serial/stm32-usart.c: In function ?stm32_receive_chars?: drivers/tty/serial/stm32-usart.c:130: warning: comparison is always true due to limited range of data type drivers/tty/serial/stm32-usart.c: In function ?stm32_tx_dma_complete?: drivers/tty/serial/stm32-usart.c:177: warning: comparison is always false due to limited range of data type stm32_usart_offsets.icr is u8, while UNDEF_REG = ~0 is int, and thus 0xffffffff. As all registers in stm32_usart_offsets are u8, change the definition of UNDEF_REG to 0xff to fix this. Fixes: ada8618ff3bfe183 ("serial: stm32: adding support for stm32f7") Signed-off-by: Geert Uytterhoeven --- Untested due to lack of hardware. --- drivers/tty/serial/stm32-usart.h | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/tty/serial/stm32-usart.h b/drivers/tty/serial/stm32-usart.h index 41d97492310271db..cd97ceb76e4ffe6f 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 = { -- 1.9.1