02ee4e9455
Bit-copying restoration of CRTC structure in failure-recovery path of drm_crtc_helper_set_config function evokes a subtle and rare, but very dangerous, corruption of CRTC mutex structure. Namely, if drm_crtc_helper_set_config takes the path under 'fail:' label *and* some other process has attempted to grab the crtc mutex (and got blocked), restoring the CRTC structure by bit-copying it will overwrite the CRTC mutex state and the waiters list pointer within the mutex structure. Consequently the blocked process will never be scheduled. This patch fixes the issue by eliminating the bit-copy restoration. The elimination is possible because previous patches have cleaned up the resoration path so that only the fields touched by the drm_crtc_helper_set_config function are saved and restored if necessary. Signed-off-by: Ilija Hadzic <ihadzic@research.bell-labs.com> Signed-off-by: Dave Airlie <airlied@redhat.com> |
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| vga | ||
| Makefile | ||