diff options
| author | Lyude Paul <lyude@redhat.com> | 2019-01-11 03:53:36 +0300 |
|---|---|---|
| committer | Lyude Paul <lyude@redhat.com> | 2019-01-11 04:38:20 +0300 |
| commit | 5e292e7646ef369e6f19c1f83f7795d5eafe3455 (patch) | |
| tree | f87ad3c73cfa0b48d0bd34bdb8936c884f29af36 /drivers | |
| parent | 013240935d4e9a7b62e876f20b45944fc2e58986 (diff) | |
| download | linux-5e292e7646ef369e6f19c1f83f7795d5eafe3455.tar.xz | |
drm/nouveau: Remove unnecessary VCPI checks in nv50_msto_cleanup()
There is no need to look at the port's VCPI allocation before calling
drm_dp_mst_deallocate_vcpi(), as we already have msto->disabled to let
us avoid cleaning up an msto more then once. The DP MST core will never
call drm_dp_mst_deallocate_vcpi() on it's own, which is presumably what
these checks are meant to protect against.
More importantly though, we're about to stop clearing mstc->port in the
next commit, which means if we could potentially hit a use-after-free
error if we tried to check mstc->port->vcpi here. So to make life easier
for anyone who bisects this code in the future, use msto->disabled
instead to check whether or not we need to deallocate VCPI instead.
Signed-off-by: Lyude Paul <lyude@redhat.com>
Reviewed-by: Ben Skeggs <bskeggs@redhat.com>
Cc: Daniel Vetter <daniel@ffwll.ch>
Cc: David Airlie <airlied@redhat.com>
Cc: Jerry Zuo <Jerry.Zuo@amd.com>
Cc: Harry Wentland <harry.wentland@amd.com>
Cc: Juston Li <juston.li@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20190111005343.17443-14-lyude@redhat.com
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/gpu/drm/nouveau/dispnv50/disp.c | 15 |
1 files changed, 9 insertions, 6 deletions
diff --git a/drivers/gpu/drm/nouveau/dispnv50/disp.c b/drivers/gpu/drm/nouveau/dispnv50/disp.c index d173cdd6ee3f..a043fafd8eaa 100644 --- a/drivers/gpu/drm/nouveau/dispnv50/disp.c +++ b/drivers/gpu/drm/nouveau/dispnv50/disp.c @@ -696,14 +696,17 @@ nv50_msto_cleanup(struct nv50_msto *msto) struct nv50_mstc *mstc = msto->mstc; struct nv50_mstm *mstm = mstc->mstm; + if (!msto->disabled) + return; + NV_ATOMIC(drm, "%s: msto cleanup\n", msto->encoder.name); - if (mstc->port && mstc->port->vcpi.vcpi > 0 && !nv50_msto_payload(msto)) + + if (mstc->port) drm_dp_mst_deallocate_vcpi(&mstm->mgr, mstc->port); - if (msto->disabled) { - msto->mstc = NULL; - msto->head = NULL; - msto->disabled = false; - } + + msto->mstc = NULL; + msto->head = NULL; + msto->disabled = false; } static void |