On Tue, 19 Oct 2010, Greg KH wrote: > On Sun, Oct 17, 2010 at 06:43:10AM +1100, Andrew Worsley wrote: > > I am writing a USB driver modeled on the drivers/usb/usb-skeleton.c > > version 2.6.30 but it gets the following warning. > > I wonder if it is a generic issue, perhaps the skeleton is not > > maintained any more? Alternatively perhaps I haven't implemented > > things properly. > > Probably because no one tests the driver. > > Can you verify that the latest version (2.6.36, which is 2 years newer > than the version you are using) still has this problem? If so, care to > post your driver code you are using so we can see what the issue is? The problem is that usb-skeleton calls usb_free_coherent() in its skel_write_bulk_callback() routine. That indirectly calls dma_pool_free(), which for some strange reason doesn't like to run in_interrupt. usb-skeleton probably should not use a coherent buffer. There's no good reason for it. Alan Stern -- 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
