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drm/nouveau: Grab payload lock in nv50_msto_payload()

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Going through the currently programmed payloads isn't safe without
holding mgr->payload_lock, so actually do that and warn if anyone tries
calling nv50_msto_payload() in the future without grabbing the right
locks.

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/20190111005343.17443-17-lyude@redhat.com
This commit is contained in:
Lyude Paul 2019-01-10 19:53:39 -05:00
parent d79a3c52f3
commit 7aa275ca0e
1 changed files with 6 additions and 0 deletions
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6
drivers/gpu/drm/nouveau/dispnv50/disp.c
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@ -672,6 +672,8 @@ nv50_msto_payload(struct nv50_msto *msto)
struct nv50_mstm *mstm = mstc->mstm;
int vcpi = mstc->port->vcpi.vcpi, i;
WARN_ON(!mutex_is_locked(&mstm->mgr.payload_lock));
NV_ATOMIC(drm, "%s: vcpi %d\n", msto->encoder.name, vcpi);
for (i = 0; i < mstm->mgr.max_payloads; i++) {
struct drm_dp_payload *payload = &mstm->mgr.payloads[i];
@ -725,6 +727,8 @@ nv50_msto_prepare(struct nv50_msto *msto)
(0x0100 << msto->head->base.index),
};
mutex_lock(&mstm->mgr.payload_lock);
NV_ATOMIC(drm, "%s: msto prepare\n", msto->encoder.name);
if (mstc->port->vcpi.vcpi > 0) {
struct drm_dp_payload *payload = nv50_msto_payload(msto);
@ -740,7 +744,9 @@ nv50_msto_prepare(struct nv50_msto *msto)
msto->encoder.name, msto->head->base.base.name,
args.vcpi.start_slot, args.vcpi.num_slots,
args.vcpi.pbn, args.vcpi.aligned_pbn);
nvif_mthd(&drm->display->disp.object, 0, &args, sizeof(args));
mutex_unlock(&mstm->mgr.payload_lock);
}
static int