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Delete IOHandlers after potentially running them

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Since commit 4bed983730 an .fd_read()
handler that deletes its IOHandler is exposed to .fd_write() being
called on the deleted IOHandler.

This patch fixes deletion so that .fd_read() and .fd_write() are never
called on an IOHandler that is marked for deletion.

Signed-off-by: Stefan Hajnoczi <stefanha@linux.vnet.ibm.com>
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
This commit is contained in:
Stefan Hajnoczi
2010-11-16 14:35:00 -06:00
committed by Anthony Liguori
parent 2cc59d8cb0
commit 0290b57bdf
1 changed files with 8 additions and 7 deletions
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vl.c
+8 -7
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@@ -1249,16 +1249,17 @@ void main_loop_wait(int nonblocking)
IOHandlerRecord *pioh;
QLIST_FOREACH_SAFE(ioh, &io_handlers, next, pioh) {
if (!ioh->deleted && ioh->fd_read && FD_ISSET(ioh->fd, &rfds)) {
ioh->fd_read(ioh->opaque);
}
if (!ioh->deleted && ioh->fd_write && FD_ISSET(ioh->fd, &wfds)) {
ioh->fd_write(ioh->opaque);
}
/* Do this last in case read/write handlers marked it for deletion */
if (ioh->deleted) {
QLIST_REMOVE(ioh, next);
qemu_free(ioh);
continue;
}
if (ioh->fd_read && FD_ISSET(ioh->fd, &rfds)) {
ioh->fd_read(ioh->opaque);
}
if (ioh->fd_write && FD_ISSET(ioh->fd, &wfds)) {
ioh->fd_write(ioh->opaque);
}
}
}