> On Mon, Aug 05, 2013 at 08:07:25AM +0000, Du, ChangbinX wrote: > > Recently when I check xHCI code, find that some functions try to get EP > > index > > from a Command Completion Event TRB via TRB_TO_EP_INDEX() macro. > > > > This is totally wrong. The macro definition is: > > > > #define TRB_TO_EP_INDEX(p) ((((p) & (0x1f << 16)) >> 16) - > > 1) > > > > TRB_TO_EP_INDEX only applies to Transfer Event TRB. But for Command > > Completion Event TRB, there is no Endpoint ID field. So, we cannot directly > > get EP index from these TRBs, but we can find it by the TRB Pointer. > > > > Here list two functions for you to check: > > handle_stopped_endpoint() > > handle_reset_ep_completion() > > Care to send a patch showing how you would change this if it is > incorrect? > > thanks, > > greg k-h > --
Hello, Greg k-h. I am not very sure about this issue. If this is true, kernel will panic when invoking above functions. I want someone help to confirm if I miss something. If it's really a bug, I will work out a patch to fix it. -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
