From 6f0a0986e328dd61610d898a09c9f4aa960ae64a Mon Sep 17 00:00:00 2001 From: Ming Lei Date: Tue, 6 Nov 2012 04:53:08 +0000 Subject: [PATCH] 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 Signed-off-by: David S. Miller --- drivers/net/usb/usbnet.c | 20 ++++++++++++++++---- 1 file changed, 16 insertions(+), 4 deletions(-) diff --git a/drivers/net/usb/usbnet.c b/drivers/net/usb/usbnet.c index 0ac1ff3571cb..5bf77171f452 100644 --- a/drivers/net/usb/usbnet.c +++ b/drivers/net/usb/usbnet.c @@ -1670,8 +1670,14 @@ 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); @@ -1682,8 +1688,14 @@ 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); -- 2.20.1