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Fix index computation in DRM output scan and CRTC match

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This commit is contained in:
Versus Void 2017-10-22 10:45:23 +00:00
parent e8f9283894
commit 2ab080e79a
1 changed files with 8 additions and 8 deletions
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16
backend/drm/drm.c
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@ -319,9 +319,10 @@ static void realloc_crtcs(struct wlr_drm_backend *drm, struct wlr_drm_connector
memset(possible_crtc, 0, sizeof(possible_crtc));
ssize_t index = -1, i = 0;
ssize_t index = -1, i = -1;
struct wlr_drm_connector *c;
wl_list_for_each(c, &drm->outputs, link) {
i++;
if (c == conn) {
index = i;
}
@ -332,7 +333,6 @@ static void realloc_crtcs(struct wlr_drm_backend *drm, struct wlr_drm_connector
possible_crtc[i] = c->possible_crtc;
crtc[c->crtc - drm->crtcs] = i;
i++;
}
assert(index != -1);
@ -686,7 +686,8 @@ void wlr_drm_scan_connectors(struct wlr_drm_backend *drm) {
}
size_t seen_len = wl_list_length(&drm->outputs);
// +1 so it can never be 0
// +1 so length can never be 0, which is undefined behaviour.
// Last element isn't used.
bool seen[seen_len + 1];
memset(seen, 0, sizeof(seen));
@ -697,7 +698,7 @@ void wlr_drm_scan_connectors(struct wlr_drm_backend *drm) {
wlr_log_errno(L_ERROR, "Failed to get DRM connector");
continue;
}
int index = 0;
int index = -1;
struct wlr_drm_connector *c, *wlr_conn = NULL;
wl_list_for_each(c, &drm->outputs, link) {
index++;
@ -794,13 +795,12 @@ void wlr_drm_scan_connectors(struct wlr_drm_backend *drm) {
drmModeFreeResources(res);
struct wlr_drm_connector *conn, *tmp_conn;
size_t index = seen_len - 1;
size_t index = wl_list_length(&drm->outputs);
wl_list_for_each_safe(conn, tmp_conn, &drm->outputs, link) {
if (seen[index]) {
index--;
index--;
if (index >= seen_len || seen[index]) {
continue;
}
index--;
wlr_log(L_INFO, "'%s' disappeared", conn->output.name);
wlr_drm_connector_cleanup(conn);