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serial: stm32: Fix comparisons with undefined register

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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: ada8618ff3 ("serial: stm32: adding support for stm32f7")
Signed-off-by: Geert Uytterhoeven <geert@linux-m68k.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Geert Uytterhoeven 2016-10-06 15:42:54 +02:00 committed by Greg Kroah-Hartman
parent 42acfc6615
commit b20fb13c7c
1 changed files with 1 additions and 1 deletions
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drivers/tty/serial/stm32-usart.h
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@ -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 = {