usbnet: runtime wake up device before calling usbnet_{read|write}_cmd
This patch 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>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/drivers/net/usb/usbnet.c b/drivers/net/usb/usbnet.c
index 0ac1ff3..5bf7717 100644
--- a/drivers/net/usb/usbnet.c
+++ b/drivers/net/usb/usbnet.c
@@ -1670,8 +1670,14 @@
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);
@@ -1682,8 +1688,14 @@
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);