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| author |   Ludovic Desroches <ludovic.desroches@atmel.com> | 2016-06-17 12:05:48 +0200 |
|---|---|---|
| committer |   Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2016-06-25 13:38:37 -0700 |
| commit | 637ba54f6051903e1f0011b75ee36b2a29696c6d (patch) | |
| tree | 5460e5b33bcb0c76f0cce88c798b6070c3068edd /drivers/tty/serial | |
| parent | tty/serial: atmel: split tx and rx paths (diff) | |
| download | linux-dev-637ba54f6051903e1f0011b75ee36b2a29696c6d.tar.xz linux-dev-637ba54f6051903e1f0011b75ee36b2a29696c6d.zip | |
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>
Diffstat (limited to 'drivers/tty/serial')
| -rw-r--r-- | drivers/tty/serial/atmel_serial.c | 6 |
1 files changed, 6 insertions, 0 deletions
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 /* |