Messages in this thread | | | Date | Thu, 5 Oct 2006 16:29:51 -0400 (EDT) | From | Alan Stern <> | Subject | Re: [linux-usb-devel] [PATCH 1/3] UEAGLE : be suspend friendly |
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On Thu, 5 Oct 2006, Pavel Machek wrote:
> Hi! > > > > > Plug/unplug should be easy enough to simulate from usb driver, no? > > > > > > if a USB driver doesn't define suspend/resume methods, then the core simply > > > unplugs it on suspend, and replugs on resume (IIRC). > > > > No longer true, and IIRC it never was. All that happens is that URB > > submissions fail with -EHOSTUNREACH once the device is suspended. > > Could we get "old" behaviour for devices like this? "printk("please > unplug/replug me\n")" is not a good solution.
I would much rather see this fixed in the driver itself.
For the time being, a "dummy" suspend routine could look like this:
static int foo_suspend(struct usb_interface *intf, pm_message_t msg) { up(&intf->dev.sem); device_release_driver(&intf->dev); down(&intf->dev.sem); return 0; }
Getting reprobed during resume would be more difficult; it would need help from userspace.
Maybe UEAGLE can do something a little more sensible...
Alan Stern
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