From 637ba54f6051903e1f0011b75ee36b2a29696c6d Mon Sep 17 00:00:00 2001 From: Ludovic Desroches Date: Fri, 17 Jun 2016 12:05:48 +0200 Subject: [PATCH] tty/serial: atmel: add comment for the ring buffer size macro There is a macro named ATMEL_SERIAL_RINGSIZE which suggesting that it corresponds to the real size of the ring buffer. Let warn people that there is a factor of four since allocation size is sizeof(struct atmel_uart_char) * ATMEL_SERIAL_RINGSIZE. Signed-off-by: Ludovic Desroches Signed-off-by: Nicolas Ferre Signed-off-by: Greg Kroah-Hartman --- drivers/tty/serial/atmel_serial.c | 6 ++++++ 1 file changed, 6 insertions(+) diff --git a/drivers/tty/serial/atmel_serial.c b/drivers/tty/serial/atmel_serial.c index 6c1ec7d0d497..857016367a7a 100644 --- a/drivers/tty/serial/atmel_serial.c +++ b/drivers/tty/serial/atmel_serial.c @@ -108,6 +108,12 @@ struct atmel_uart_char { u16 ch; }; +/* + * Be careful, the real size of the ring buffer is + * sizeof(atmel_uart_char) * ATMEL_SERIAL_RINGSIZE. It means that ring buffer + * can contain up to 1024 characters in PIO mode and up to 4096 characters in + * DMA mode. + */ #define ATMEL_SERIAL_RINGSIZE 1024 /*