tree a863bec4278a403bd63336b4f01b45794a987805
parent d22a69892bd8f29e3096f6f54c2c00d8aec2e796
author Amit Shah <amit.shah@redhat.com> 1283432909 +0530
committer Rusty Russell <rusty@rustcorp.com.au> 1287645243 +1030

virtio: console: Add reference counting for port struct

When a port got hot-unplugged, when a port was open, any file operation
after the unplugging resulted in a crash. This is fixed by ref-counting
the port structure, and releasing it only when the file is closed.

This splits the unplug operation in two parts: first marks the port
as unavailable, removes all the buffers in the vqs and removes the port
from the per-device list of ports. The second stage, invoked when all
references drop to zero, releases the chardev and frees all other memory.

Signed-off-by: Amit Shah <amit.shah@redhat.com>
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>