serial: atmel_serial: include circ_buf.h

atmel_uart_port::rx_ring is defined as struct circ_buf, but circ_buf.h
is not included explicitly in atmel_serial.c. It is included only
implicitly via serial_core.h. Fix this as serial_core.h might not
include that header in the future.

Signed-off-by:Jiri Slaby <jslaby@suse.cz>

Cc: Richard Genoud <richard.genoud@gmail.com>
Cc: Nicolas Ferre <nicolas.ferre@microchip.com>
Cc: Alexandre Belloni <alexandre.belloni@bootlin.com>
Cc: Ludovic Desroches <ludovic.desroches@microchip.com>
Acked-by: Richard Genoud <richard.genoud@gmail.com>
Signed-off-by: Richard Genoud <richard.genoud@gmail.com>
Link: https://lore.kernel.org/r/20220124071430.14907-3-jslaby@suse.cz
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/tty/serial/atmel_serial.c b/drivers/tty/serial/atmel_serial.c
index c370edd..2d09a89 100644 (file)
--- a/drivers/tty/serial/atmel_serial.c
+++ b/drivers/tty/serial/atmel_serial.c
@@ -8,6 +8,7 @@
  *
  *  DMA support added by Chip Coldwell.
  */
+#include <linux/circ_buf.h>
 #include <linux/tty.h>
 #include <linux/ioport.h>
 #include <linux/slab.h>