On Fri, Jun 14, 2013 at 04:38:03PM +0300, Jussi Kivilinna wrote: > Appearently some out-of-tree USB host drivers do not handle DMA alignment for > URB buffers and let core/hcd.c to do the mapping on architectures that have > minimum DMA alignment requirements. This leads to random memory corruptions > and crashes when using USB device drivers that use unaligned URB buffers. > > Instead of fixing host drivers, users end up posting bug reports against > those USB device drivers that use unaligned buffers for URB; such as with > rtl8192cu (http://thread.gmane.org/gmane.linux.kernel.wireless.general/105631). > > Patch makes this issue more visible at core level, and hopefully gives hint > for future hcd driver implementors about this problem. You should be more forceful in your warning messages to blame the host controller, as it is, if I was a user and I saw: > + WARN_ONCE(1, "urb->setup_packet not DMA aligned.\n"); I would think that the device driver was still the problem, not the host controller. thanks, 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
