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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 <ludovic.desroches@atmel.com>
Signed-off-by: Nicolas Ferre <nicolas.ferre@atmel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Ludovic Desroches 2016-06-17 12:05:48 +02:00 committed by Greg Kroah-Hartman
parent 00e8e65870
commit 637ba54f60
1 changed files with 6 additions and 0 deletions
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6
drivers/tty/serial/atmel_serial.c
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@ -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
/*