[PATCH v2 5/5] usbnet: make device out of suspend before calling usbnet_read[write]_cmd

[Ming Lei <ming.lei@canonical.com>]

This patche gets the runtime PM reference count before calling
usbnet_read[write]_cmd, and puts it after completion of the
usbnet_read[write]_cmd, so that the usb control message can always
be sent to one active device in the non-PM context.

Signed-off-by: Ming Lei <ming.lei@canonical.com>
---
 drivers/net/usb/usbnet.c |   18 ++++++++++++++----
 1 file changed, 14 insertions(+), 4 deletions(-)

diff --git a/drivers/net/usb/usbnet.c b/drivers/net/usb/usbnet.c
index a7fb074..74caa67 100644
--- a/drivers/net/usb/usbnet.c
+++ b/drivers/net/usb/usbnet.c
@@ -1673,8 +1673,13 @@ out:
 int usbnet_read_cmd(struct usbnet *dev, u8 cmd, u8 reqtype,
 		    u16 value, u16 index, void *data, u16 size)
 {
-	return __usbnet_read_cmd(dev, cmd, reqtype, value, index,
-				 data, size);
+	int ret;
+	if (usb_autopm_get_interface(dev->intf) < 0)
+		return -ENODEV;
+	ret = __usbnet_read_cmd(dev, cmd, reqtype, value, index,
+				data, size);
+	usb_autopm_put_interface(dev->intf);
+	return ret;
 }
 EXPORT_SYMBOL_GPL(usbnet_read_cmd);
 
@@ -1685,8 +1690,13 @@ EXPORT_SYMBOL_GPL(usbnet_read_cmd);
 int usbnet_write_cmd(struct usbnet *dev, u8 cmd, u8 reqtype,
 		     u16 value, u16 index, const void *data, u16 size)
 {
-	return __usbnet_write_cmd(dev, cmd, reqtype, value, index,
-				  data, size);
+	int ret;
+	if (usb_autopm_get_interface(dev->intf) < 0)
+		return -ENODEV;
+	ret = __usbnet_write_cmd(dev, cmd, reqtype, value, index,
+				 data, size);
+	usb_autopm_put_interface(dev->intf);
+	return ret;
 }
 EXPORT_SYMBOL_GPL(usbnet_write_cmd);
 
-- 
1.7.9.5