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backend/session: allow wlr_session_find_gpus to return an error

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Sometimes wlr_session_find_gpus will encounter an error. This is
different from finding zero GPUs.

On error, wlr_session_find_gpus already returns -1. However, this is
casted to size_t, so callers uncorrectly assume this is a success.

Instead, make wlr_session_find_gpus return a ssize_t and allow callers
to handle the error accordingly.
This commit is contained in:
Simon Ser 2020-12-28 10:52:40 +01:00
parent 7febdc7334
commit e8d56ca415
3 changed files with 12 additions and 7 deletions
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11
backend/backend.c
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@ -150,11 +150,16 @@ static struct wlr_backend *attempt_noop_backend(struct wl_display *display) {
static struct wlr_backend *attempt_drm_backend(struct wl_display *display,
struct wlr_backend *backend, struct wlr_session *session) {
struct wlr_device *gpus[8];
size_t num_gpus = wlr_session_find_gpus(session, 8, gpus);
struct wlr_backend *primary_drm = NULL;
ssize_t num_gpus = wlr_session_find_gpus(session, 8, gpus);
if (num_gpus < 0) {
wlr_log(WLR_ERROR, "Failed to find GPUs");
return NULL;
}
wlr_log(WLR_INFO, "Found %zu GPUs", num_gpus);
for (size_t i = 0; i < num_gpus; ++i) {
struct wlr_backend *primary_drm = NULL;
for (size_t i = 0; i < (size_t)num_gpus; ++i) {
struct wlr_backend *drm = wlr_drm_backend_create(display, session,
gpus[i], primary_drm);
if (!drm) {