On Tue, 2015-11-17 at 13:07 +0100, Steinar H. Gunderson wrote: > On Mon, Nov 16, 2015 at 03:22:06PM -0500, Alan Stern wrote: > > Check that userspace requested zerocopy (otherwise the user > > program might try to access other data stored in the same cache > > lines as the buffer while the I/O is in progres); > > Needed for send only, right? For receive, I guess you're not allowed to > modify the buffer while the transfer is going on anyway. No, send is the harmless case. You just make sure the cache is flushed. For receive the issue is that touching memory next to the memory used as buffer can alter the buffer. The buffer itself is a clear issue. Regards Oliver -- 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
