On Mon, Jul 04, 2011 at 11:56:27PM +1000, Benjamin Herrenschmidt wrote: > On Mon, 2011-07-04 at 20:57 +1000, Anton Blanchard wrote: > > .../... > > > The hypervisor gives us a busy return, so we could retry a number of > > times instead of dropping it on the floor. We'd need to do it in the > > hvc_console driver - the tty drivers share the same backend > > functions so we can't hide it in the pseries put_chars function. > > For kernel console, I don't see why not wait forever ... If the > underlying backend really lost the connection it can always return a > negative error no ? > > Or we could have "well defined" return codes for "wait forever" vs. > "drop this" ... maybe return -EAGAIN.
I will check this again for my hvc_iucv back-end. Meanwhile a found an old thread discussing the same issue. It covers some differences between console and ttys which actually does not matter for hvc-backend because of the shared put_chars() routine. You can read the thread on lkml.org: http://lkml.org/lkml/2009/10/15/149 Kind regards, Hendrik _______________________________________________ Linuxppc-dev mailing list Linuxppc-dev@lists.ozlabs.org https://lists.ozlabs.org/listinfo/linuxppc-dev
