linux-kernel - [PATCH] tty/serial: atmel: remove cache when unnecessary

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Date:   Tue, 21 Feb 2017 13:03:57 +0100
From:   Alexandre Belloni <alexandre.belloni@...e-electrons.com>
To:     Richard Genoud <richard.genoud@...il.com>
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Nicolas Ferre <nicolas.ferre@...rochip.com>,
        linux-arm-kernel@...ts.infradead.org, linux-serial@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        Alexandre Belloni <alexandre.belloni@...e-electrons.com>
Subject: [PATCH] tty/serial: atmel: remove cache when unnecessary

struct cache is only used in suspend/resume. Exclude it when PM is not
selected.

Suggested-by: Richard Genoud <richard.genoud@...il.com>
Signed-off-by: Alexandre Belloni <alexandre.belloni@...e-electrons.com>
---
 drivers/tty/serial/atmel_serial.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/tty/serial/atmel_serial.c b/drivers/tty/serial/atmel_serial.c
index dcebb28ffbc4..f0d4894267c2 100644
--- a/drivers/tty/serial/atmel_serial.c
+++ b/drivers/tty/serial/atmel_serial.c
@@ -175,6 +175,7 @@ struct atmel_uart_port {
 	unsigned int		pending_status;
 	spinlock_t		lock_suspended;
 
+#ifdef CONFIG_PM
 	struct {
 		u32		cr;
 		u32		mr;
@@ -185,6 +186,7 @@ struct atmel_uart_port {
 		u32		fmr;
 		u32		fimr;
 	} cache;
+#endif
 
 	int (*prepare_rx)(struct uart_port *port);
 	int (*prepare_tx)(struct uart_port *port);
-- 
2.11.0