Re: [PATCH] usb: don't spit out too much errors with suspended devices

[David Brownell]

On Wednesday 27 October 2004 00:19, Colin Leroy wrote:
> On 26 Oct 2004 at 09h10, David Brownell wrote:
> 
> Hi, 
> 
> > What's wrong there is emitting voluminous diagnostics for
> > something that's not an error ... the root hub is suspended,
> > and as with any suspended device, you can't talk to it.
> > The descriptor read logic can skip retries in that case, and
> > usbfs should refuse up front to talk to suspended devices.
> > (Silently!)
> 
> Here's a patch that does it. Hope it's fine.

The "message.c" part is fine, but the usbfs/devio change
only tests one of several paths for device access.  (My
first whack at this only covered a different one!)  Can
you verify this one instead?

- Dave


--- 1.67/drivers/usb/core/message.c	Tue Oct 26 09:42:33 2004
+++ edited/drivers/usb/core/message.c	Wed Oct 27 16:02:03 2004
@@ -704,6 +704,8 @@
 	int err;
 	unsigned int u, idx;
 
+	if (dev->state == USB_STATE_SUSPENDED)
+		return -EHOSTUNREACH;
 	if (size <= 0 || !buf || !index)
 		return -EINVAL;
 	buf[0] = 0;
--- 1.67/drivers/usb/core/devio.c	Wed Oct 20 11:45:30 2004
+++ edited/drivers/usb/core/devio.c	Wed Oct 27 16:07:40 2004
@@ -411,6 +411,8 @@
 
 static int checkintf(struct dev_state *ps, unsigned int ifnum)
 {
+	if (ps->dev->state != USB_STATE_CONFIGURED)
+		return -EHOSTUNREACH;
 	if (ifnum >= 8*sizeof(ps->ifclaimed))
 		return -EINVAL;
 	if (test_bit(ifnum, &ps->ifclaimed))
@@ -450,6 +452,8 @@
 {
 	int ret = 0;
 
+	if (ps->dev->state != USB_STATE_CONFIGURED)
+		return -EHOSTUNREACH;
 	if (USB_TYPE_VENDOR == (USB_TYPE_MASK & requesttype))
 		return 0;
 
@@ -1131,7 +1135,7 @@
 	}
 
 	if (ps->dev->state != USB_STATE_CONFIGURED)
-		retval = -ENODEV;
+		retval = -EHOSTUNREACH;
 	else if (!(intf = usb_ifnum_to_if (ps->dev, ctrl.ifno)))
                retval = -EINVAL;
 	else switch (ctrl.ioctl_code) {