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Wait for pending flips in drmmode_output_set_tear_free

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This prevents a nested call to drmHandleEvent, which would hang.

Fixes hangs when disabling TearFree on a CRTC while a DRI3 client is
page flipping.

(Ported from amdgpu commit 04947b83cce3a7782e59dece2c7797cc396c1e05)
Acked-by: Alex Deucher <alexander.deucher@amd.com>
This commit is contained in:
Michel Dänzer
2018-07-10 18:57:49 +02:00
committed by Michel Dänzer
parent f01d8cf2bd
commit cf8bc72e34
1 changed files with 8 additions and 0 deletions
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8
src/drmmode_display.c
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@@ -1754,6 +1754,14 @@ drmmode_output_set_tear_free(RADEONEntPtr pRADEONEnt,
drmmode_output->tear_free = tear_free;
if (crtc) {
drmmode_crtc_private_ptr drmmode_crtc = crtc->driver_private;
/* Wait for pending flips before drmmode_set_mode_major calls
* drmmode_crtc_update_tear_free, to prevent a nested
* drmHandleEvent call, which would hang
*/
drmmode_crtc_wait_pending_event(drmmode_crtc, pRADEONEnt->fd,
drmmode_crtc->flip_pending);
drmmode_set_mode_major(crtc, &crtc->mode, crtc->rotation,
crtc->x, crtc->y);
}