Hi, this code made me think: /* Give this link TRB to the hardware */ wmb(); next->link.control ^= cpu_to_le32(TRB_CYCLE); Can you do this or may there be a CPU that speculatively writes before it reads next->link.control ? Regards Oliver -- - - - SUSE LINUX Products GmbH, GF: Jeff Hawn, Jennifer Guild, Felix Imendörffer, HRB 16746 (AG Nürnberg) Maxfeldstraße 5 90409 Nürnberg Germany - - - -- To unsubscribe from this list: send the line "unsubscribe linux-arm-msm" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html