On Wed, 2013-02-20 at 15:03 -0500, Peter Hurley wrote: > The semantics of a rw semaphore are almost ideally suited > for tty line discipline lifetime management; multiple active > threads obtain "references" (read locks) while performing i/o > to prevent the loss or change of the current line discipline > (write lock). > > Unfortunately, the existing rw_semaphore is ill-suited in other > ways; > 1) obtaining a "reference" can be recursive, ie., a reference holder > may attempt to obtain another "reference". Recursive read locks > are not supported by rwsem. Hi Greg, I just finished auditing all the recursive usage of the tty/ldisc layer and I can make this lock non-recursive. Please hold off applying this and I'll send you a v5 series in a couple of days, ok? Regards, Peter Hurley -- To unsubscribe from this list: send the line "unsubscribe linux-serial" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
