tree 518f59ef252b27e505ea0d4bc73e1665ebfe9421
parent e4199103bd85fae76ce7009d7d6abacf28f1f972
author Amit Shah <amit.shah@redhat.com> 1371618425 +0530
committer Amit Shah <amit.shah@redhat.com> 1374759327 +0530

virtio: console: return -ENODEV on all read operations after unplug

If a port gets unplugged while a user is blocked on read(), -ENODEV is
returned.  However, subsequent read()s returned 0, indicating there's no
host-side connection (but not indicating the device went away).

This also happened when a port was unplugged and the user didn't have
any blocking operation pending.  If the user didn't monitor the SIGIO
signal, they won't have a chance to find out if the port went away.

Fix by returning -ENODEV on all read()s after the port gets unplugged.
write() already behaves this way.

CC: <stable@vger.kernel.org>
Signed-off-by: Amit Shah <amit.shah@redhat.com>