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Revert "char: use a fixed idx for child muxed chr"

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That commit mis-used mux char: the frontend are multiplexed, not the
backend. Fix the regression preventing "c-a c" to switch the focus. The
following patches will fix the crash (when leaving or removing frontend)
by tracking frontends with handler tags.

This reverts commit 949055a254.

Signed-off-by: Marc-André Lureau <marcandre.lureau@redhat.com>
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
This commit is contained in:
Marc-André Lureau 2016-10-13 15:14:41 +04:00 committed by Peter Maydell
parent c9662023ab
commit 692d88b408
2 changed files with 7 additions and 16 deletions
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1
include/sysemu/char.h
View file

@ -107,7 +107,6 @@ struct CharDriverState {
int explicit_be_open;
int avail_connections;
int is_mux;
int mux_idx;
guint fd_in_tag;
bool replay;
DECLARE_BITMAP(features, QEMU_CHAR_FEATURE_LAST);

22
qemu-char.c
View file

@ -165,7 +165,6 @@ CharDriverState *qemu_chr_alloc(ChardevCommon *backend, Error **errp)
CharDriverState *chr = g_malloc0(sizeof(CharDriverState));
qemu_mutex_init(&chr->chr_write_lock);
chr->mux_idx = -1;
if (backend->has_logfile) {
int flags = O_WRONLY | O_CREAT;
if (backend->has_logappend &&
@ -739,25 +738,17 @@ static void mux_chr_update_read_handler(CharDriverState *chr,
GMainContext *context)
{
MuxDriver *d = chr->opaque;
int idx;
if (d->mux_cnt >= MAX_MUX) {
fprintf(stderr, "Cannot add I/O handlers, MUX array is full\n");
return;
}
if (chr->mux_idx == -1) {
chr->mux_idx = d->mux_cnt++;
}
idx = chr->mux_idx;
d->ext_opaque[idx] = chr->handler_opaque;
d->chr_can_read[idx] = chr->chr_can_read;
d->chr_read[idx] = chr->chr_read;
d->chr_event[idx] = chr->chr_event;
d->ext_opaque[d->mux_cnt] = chr->handler_opaque;
d->chr_can_read[d->mux_cnt] = chr->chr_can_read;
d->chr_read[d->mux_cnt] = chr->chr_read;
d->chr_event[d->mux_cnt] = chr->chr_event;
/* Fix up the real driver with mux routines */
if (d->mux_cnt == 1) {
if (d->mux_cnt == 0) {
qemu_chr_add_handlers_full(d->drv, mux_chr_can_read,
mux_chr_read,
mux_chr_event,
@ -766,7 +757,8 @@ static void mux_chr_update_read_handler(CharDriverState *chr,
if (d->focus != -1) {
mux_chr_send_event(d, d->focus, CHR_EVENT_MUX_OUT);
}
d->focus = idx;
d->focus = d->mux_cnt;
d->mux_cnt++;
mux_chr_send_event(d, d->focus, CHR_EVENT_MUX_IN);
}