USB: simplify the interface of usb_get_status()
This patch simplifies the interface presented by usb_get_status().
Instead of forcing callers to check for the proper data length and
convert the status value to host byte order, the function will now
do these things itself.
Signed-off-by: Alan Stern <stern@rowland.harvard.edu>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
diff --git a/drivers/usb/core/hub.c b/drivers/usb/core/hub.c
index c881830..11a9219 100644
--- a/drivers/usb/core/hub.c
+++ b/drivers/usb/core/hub.c
@@ -1464,11 +1464,10 @@
* and battery-powered root hubs (may provide just 8 mA).
*/
ret = usb_get_status(hdev, USB_RECIP_DEVICE, 0, &hubstatus);
- if (ret < 2) {
+ if (ret) {
message = "can't get hub status";
goto fail;
}
- le16_to_cpus(&hubstatus);
hcd = bus_to_hcd(hdev->bus);
if (hdev == hdev->bus->root_hub) {
if (hcd->power_budget > 0)
@@ -3101,8 +3100,6 @@
if (status == 0) {
devstatus = 0;
status = usb_get_status(udev, USB_RECIP_DEVICE, 0, &devstatus);
- if (status >= 0)
- status = (status > 0 ? 0 : -ENODEV);
/* If a normal resume failed, try doing a reset-resume */
if (status && !udev->reset_resume && udev->persist_enabled) {
@@ -3123,7 +3120,6 @@
*/
} else if (udev->actconfig && !udev->reset_resume) {
if (!hub_is_superspeed(udev->parent)) {
- le16_to_cpus(&devstatus);
if (devstatus & (1 << USB_DEVICE_REMOTE_WAKEUP))
status = usb_control_msg(udev,
usb_sndctrlpipe(udev, 0),
@@ -3135,7 +3131,6 @@
} else {
status = usb_get_status(udev, USB_RECIP_INTERFACE, 0,
&devstatus);
- le16_to_cpus(&devstatus);
if (!status && devstatus & (USB_INTRF_STAT_FUNC_RW_CAP
| USB_INTRF_STAT_FUNC_RW))
status =
@@ -4481,11 +4476,10 @@
status = usb_get_status(udev, USB_RECIP_DEVICE, 0,
&devstat);
- if (status < 2) {
+ if (status) {
dev_dbg(&udev->dev, "get status %d ?\n", status);
goto loop_disable;
}
- le16_to_cpus(&devstat);
if ((devstat & (1 << USB_DEVICE_SELF_POWERED)) == 0) {
dev_err(&udev->dev,
"can't connect bus-powered hub "
diff --git a/drivers/usb/core/message.c b/drivers/usb/core/message.c
index e7ee1e4..6549a97 100644
--- a/drivers/usb/core/message.c
+++ b/drivers/usb/core/message.c
@@ -934,13 +934,13 @@
*
* This call is synchronous, and may not be used in an interrupt context.
*
- * Returns the number of bytes received on success, or else the status code
- * returned by the underlying usb_control_msg() call.
+ * Returns 0 and the status value in *@data (in host byte order) on success,
+ * or else the status code from the underlying usb_control_msg() call.
*/
int usb_get_status(struct usb_device *dev, int type, int target, void *data)
{
int ret;
- u16 *status = kmalloc(sizeof(*status), GFP_KERNEL);
+ __le16 *status = kmalloc(sizeof(*status), GFP_KERNEL);
if (!status)
return -ENOMEM;
@@ -949,7 +949,12 @@
USB_REQ_GET_STATUS, USB_DIR_IN | type, 0, target, status,
sizeof(*status), USB_CTRL_GET_TIMEOUT);
- *(u16 *)data = *status;
+ if (ret == 2) {
+ *(u16 *) data = le16_to_cpu(*status);
+ ret = 0;
+ } else if (ret >= 0) {
+ ret = -EIO;
+ }
kfree(status);
return ret;
}
diff --git a/drivers/usb/misc/usbtest.c b/drivers/usb/misc/usbtest.c
index 8b4ca1c..aa28ac8 100644
--- a/drivers/usb/misc/usbtest.c
+++ b/drivers/usb/misc/usbtest.c
@@ -747,9 +747,9 @@
/* [9.4.5] get_status always works */
retval = usb_get_status(udev, USB_RECIP_DEVICE, 0, dev->buf);
- if (retval != 2) {
+ if (retval) {
dev_err(&iface->dev, "get dev status --> %d\n", retval);
- return (retval < 0) ? retval : -EDOM;
+ return retval;
}
/* FIXME configuration.bmAttributes says if we could try to set/clear
@@ -758,9 +758,9 @@
retval = usb_get_status(udev, USB_RECIP_INTERFACE,
iface->altsetting[0].desc.bInterfaceNumber, dev->buf);
- if (retval != 2) {
+ if (retval) {
dev_err(&iface->dev, "get interface status --> %d\n", retval);
- return (retval < 0) ? retval : -EDOM;
+ return retval;
}
/* FIXME get status for each endpoint in the interface */
@@ -1351,7 +1351,6 @@
ep, retval);
return retval;
}
- le16_to_cpus(&status);
if (status != 1) {
ERROR(tdev, "ep %02x bogus status: %04x != 1\n", ep, status);
return -EINVAL;