From: Michel Dänzer <mdaenzer@redhat.com>
Date: Thu, 2 Jul 2020 16:49:26 +0000 (+0200)
Subject: Revert "loader/dri3: Check for window destruction in dri3_wait_for_event_locked"
X-Git-Url: https://git.libre-soc.org/?p=mesa.git;a=commitdiff_plain;h=31392f837110f17c6037b4861056a891e078c083

Revert "loader/dri3: Check for window destruction in dri3_wait_for_event_locked"

This reverts commit d7d7687829875e401690219d4a72458fb2bbe4de.

It caused freezes with e.g. kwin_x11 due to hitting the 1s timeout.

Closes: https://gitlab.freedesktop.org/mesa/mesa/-/issues/3214
Reopens: https://gitlab.freedesktop.org/mesa/mesa/-/issues/116
Acked-by: Marek Olšák <marek.olsak@amd.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/5722>
---

diff --git a/src/loader/loader_dri3_helper.c b/src/loader/loader_dri3_helper.c
index 97b5182994a..425faba8f64 100644
--- a/src/loader/loader_dri3_helper.c
+++ b/src/loader/loader_dri3_helper.c
@@ -22,7 +22,6 @@
  */
 
 #include <fcntl.h>
-#include <poll.h>
 #include <stdlib.h>
 #include <unistd.h>
 #include <string.h>
@@ -533,55 +532,20 @@ dri3_wait_for_event_locked(struct loader_dri3_drawable *draw,
    xcb_generic_event_t *ev;
    xcb_present_generic_event_t *ge;
 
-   if (draw->window_destroyed)
-      return false;
-
    xcb_flush(draw->conn);
 
    /* Only have one thread waiting for events at a time */
    if (draw->has_event_waiter) {
       cnd_wait(&draw->event_cnd, &draw->mtx);
-      if (draw->window_destroyed)
-         return false;
       if (full_sequence)
          *full_sequence = draw->last_special_event_sequence;
       /* Another thread has updated the protected info, so retest. */
       return true;
    } else {
-      struct pollfd pfds;
-
       draw->has_event_waiter = true;
       /* Allow other threads access to the drawable while we're waiting. */
       mtx_unlock(&draw->mtx);
-
-      pfds.fd = xcb_get_file_descriptor(draw->conn);
-      pfds.events = POLLIN;
-
-      ev = xcb_poll_for_special_event(draw->conn, draw->special_event);
-      while (!ev) {
-         /* Wait up to ~1s for the XCB FD to become readable */
-         if (poll(&pfds, 1, 1000) < 1) {
-            xcb_get_window_attributes_cookie_t cookie;
-            xcb_get_window_attributes_reply_t *attrib;
-            xcb_generic_error_t *error;
-
-            /* Check if the window still exists */
-            cookie = xcb_get_window_attributes(draw->conn, draw->drawable);
-            attrib = xcb_get_window_attributes_reply(draw->conn, cookie, &error);
-            free(attrib);
-
-            if (error) {
-               if (error->error_code == BadWindow)
-                  draw->window_destroyed = true;
-
-               free(error);
-               break;
-            }
-         }
-
-         ev = xcb_poll_for_special_event(draw->conn, draw->special_event);
-      }
-
+      ev = xcb_wait_for_special_event(draw->conn, draw->special_event);
       mtx_lock(&draw->mtx);
       draw->has_event_waiter = false;
       cnd_broadcast(&draw->event_cnd);
diff --git a/src/loader/loader_dri3_helper.h b/src/loader/loader_dri3_helper.h
index 0961534a792..c314e4c5a9d 100644
--- a/src/loader/loader_dri3_helper.h
+++ b/src/loader/loader_dri3_helper.h
@@ -122,7 +122,6 @@ struct loader_dri3_drawable {
    uint8_t have_back;
    uint8_t have_fake_front;
    uint8_t is_pixmap;
-   bool window_destroyed;
 
    /* Information about the GPU owning the buffer */
    __DRIscreen *dri_screen;