On Thu, Jun 30, 2011 at 01:53:31PM -0700, Sarah Sharp wrote: > On Thu, Jun 30, 2011 at 01:43:42PM -0700, Greg KH wrote: > > On Thu, Jun 30, 2011 at 01:26:37PM -0700, Sarah Sharp wrote: > > > Hi Alan, > > > > > > In an upcoming patchset, I'm going to need to walk the USB tree in the > > > xHCI driver in order to gather some information during a device > > > configuration or alt setting change. Is there anything stopping the USB > > > tree from changing while this operation is in progress? > > > > Not if you use the proper "walk the bus for all devices" functions that > > the driver core provides. Use them and you should be fine, right? > > Which functions are those? The bus_for_each_dev() functions. Or you can do what the USB devices file does, and use the usb_bus_list_lock and just walk all devices manually. See the function, usb_device_read() for an example of how to do that safely. hope this helps, greg k-h -- To unsubscribe from this list: send the line "unsubscribe linux-usb" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
