From: Felipe Balbi <balbi@ti.com>
Date: Fri, 7 Sep 2012 18:10:33 +0000 (+0300)
Subject: serial: omap: fix DeviceTree boot
X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=ce2f08ded291188b684e3d2e9940132514ada0a9;p=GitHub%2Fexynos8895%2Fandroid_kernel_samsung_universal8895.git

serial: omap: fix DeviceTree boot

OMAP Architecture code, passes a few function
pointers for UART driver to use in order to
properly implement Power Management and Wakeup
capabilities.

The problem is that those function pointers,
which are passed (ab)using platform_data on
non-DT kernels, can't be passed down to drivers
through DT.

commit e5b57c0 (serial: omap: define helpers
for pdata function pointers) failed to take DT
kernels into consideration and caused a regression
to DT kernel boot.

Fix that by (re-)adding a check for valid pdata
pointer together with valid pdata->$FUNCTION
pointer.

Reported-by: Tony Lindgren <tony@atomide.com>
Signed-off-by: Felipe Balbi <balbi@ti.com>
Tested-by: Tony Lindgren <tony@atomide.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---

diff --git a/drivers/tty/serial/omap-serial.c b/drivers/tty/serial/omap-serial.c
index 0a6e78e15a40..743e8e1249da 100644
--- a/drivers/tty/serial/omap-serial.c
+++ b/drivers/tty/serial/omap-serial.c
@@ -143,7 +143,7 @@ static int serial_omap_get_context_loss_count(struct uart_omap_port *up)
 {
 	struct omap_uart_port_info *pdata = up->dev->platform_data;
 
-	if (!pdata->get_context_loss_count)
+	if (!pdata || !pdata->get_context_loss_count)
 		return 0;
 
 	return pdata->get_context_loss_count(up->dev);
@@ -153,24 +153,30 @@ static void serial_omap_set_forceidle(struct uart_omap_port *up)
 {
 	struct omap_uart_port_info *pdata = up->dev->platform_data;
 
-	if (pdata->set_forceidle)
-		pdata->set_forceidle(up->dev);
+	if (!pdata || !pdata->set_forceidle)
+		return;
+
+	pdata->set_forceidle(up->dev);
 }
 
 static void serial_omap_set_noidle(struct uart_omap_port *up)
 {
 	struct omap_uart_port_info *pdata = up->dev->platform_data;
 
-	if (pdata->set_noidle)
-		pdata->set_noidle(up->dev);
+	if (!pdata || !pdata->set_noidle)
+		return;
+
+	pdata->set_noidle(up->dev);
 }
 
 static void serial_omap_enable_wakeup(struct uart_omap_port *up, bool enable)
 {
 	struct omap_uart_port_info *pdata = up->dev->platform_data;
 
-	if (pdata->enable_wakeup)
-		pdata->enable_wakeup(up->dev, enable);
+	if (!pdata || !pdata->enable_wakeup)
+		return;
+
+	pdata->enable_wakeup(up->dev, enable);
 }
 
 /*