In glamor_init(), if the minimum requirements are not met, glamor may
fail after setting up its own CloseScreen() and DestroyPixmap()
routines, leading to a crash when either of the two routines is called
if glamor failed to complete its initialization, e.g:
(EE) Backtrace:
(EE) 0: Xwayland (OsSigHandler+0x29)
(EE) 1: /lib64/libpthread.so.0 (__restore_rt+0x0)
(EE) 2: Xwayland (glamor_sync_close+0x2a)
(EE) 3: Xwayland (glamor_close_screen+0x52)
(EE) 4: Xwayland (CursorCloseScreen+0x88)
(EE) 5: Xwayland (AnimCurCloseScreen+0xa4)
(EE) 6: Xwayland (present_close_screen+0x42)
(EE) 7: Xwayland (dix_main+0x4f9)
(EE) 8: /lib64/libc.so.6 (__libc_start_main+0xf1)
(EE) 9: Xwayland (_start+0x2a)
Restore the previous CloseScreen() and DestroyPixmap() vfunc handlers in
case of failure when checking for the minimum requirements, so that if
any of the requirement is not met we don't leave the CloseScreen() and
DestroyPixmap() from glamor handlers in place.
Bugzilla: https://bugzilla.redhat.com/show_bug.cgi?id=1390018
Signed-off-by: Olivier Fourdan <ofourdan@redhat.com>
Reviewed-by: Hans de Goede <hdegoede@redhat.com>
Reviewed-by: Eric Anholt <eric@anholt.net>
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