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config/output: don't change output state before commit

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Previously, we called output_disable prior to wlr_output_commit. This
mutates Sway's output state before the output commit actually succeeds.
This results in Sway's state getting out-of-sync with wlroots'.

An alternative fix [1] was to revert the changes made by output_disable
in case of failure. This is a little complicated. Instead, this patch
makes it so Sway's internal state is never changed before a successful
wlr_output commit.

We had two output flags: enabled and configured. However enabled was set
prior to the output becoming enabled, and was used to prevent the output
event handlers (specifically, the mode handler) from calling
apply_output_config again (infinite loop).

Rename enabled to enabling and use it exclusively for this purpose.
Rename configure to enabled, because that's what it really means.

[1]: https://github.com/swaywm/sway/pull/5521

Closes: https://github.com/swaywm/sway/issues/5483
This commit is contained in:
Simon Ser 2020-07-10 18:04:45 +02:00 • committed by Brian Ashworth
parent ea3ba203cc
commit 5432f00adf
5 changed files with 23 additions and 26 deletions
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26
sway/config/output.c
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@ -397,17 +397,8 @@ bool apply_output_config(struct output_config *oc, struct sway_output *output) {
struct wlr_output *wlr_output = output->wlr_output;
bool was_enabled = output->enabled;
if (oc && !oc->enabled) {
// Output is configured to be disabled
sway_log(SWAY_DEBUG, "Disabling output %s", oc->name);
if (output->enabled) {
output_disable(output);
wlr_output_layout_remove(root->output_layout, wlr_output);
}
} else {
output->enabled = true;
}
// Flag to prevent the output mode event handler from calling us
output->enabling = (!oc || oc->enabled);
queue_output_config(oc, output);
@ -421,11 +412,18 @@ bool apply_output_config(struct output_config *oc, struct sway_output *output) {
// Leave the output disabled for now and try again when the output gets
// the mode we asked for.
sway_log(SWAY_ERROR, "Failed to commit output %s", wlr_output->name);
output->enabled = was_enabled;
output->enabling = false;
return false;
}
output->enabling = false;
if (oc && !oc->enabled) {
sway_log(SWAY_DEBUG, "Disabling output %s", oc->name);
if (output->enabled) {
output_disable(output);
wlr_output_layout_remove(root->output_layout, wlr_output);
}
return true;
}
@ -468,8 +466,8 @@ bool apply_output_config(struct output_config *oc, struct sway_output *output) {
output->width = output_box->width;
output->height = output_box->height;
if (!output->configured) {
output_configure(output);
if (!output->enabled) {
output_enable(output);
}
if (oc && oc->max_render_time >= 0) {