Coverity: nouveau_dp_irq(): Null pointer dereferences

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This is an experimental semi-automated report about issues detected by
Coverity from a scan of next-20221110 as part of the linux-next scan project:

You're getting this email because you were associated with the identified
lines of code (noted below) that were touched by commits:

  Mon Aug 31 19:10:08 2020 -0400
    a0922278f83e ("drm/nouveau/kms/nv50-: Refactor and cleanup DP HPD handling")

Coverity reported the following:

*** CID 1527266:  Null pointer dereferences  (REVERSE_INULL)
drivers/gpu/drm/nouveau/nouveau_dp.c:237 in nouveau_dp_irq()
231     	struct nouveau_encoder *outp = find_encoder(connector, DCB_OUTPUT_DP);
232     	struct nouveau_drm *drm = nouveau_drm(outp->;
233     	struct nv50_mstm *mstm;
234     	u64 hpd = 0;
235     	int ret;
vvv     CID 1527266:  Null pointer dereferences  (REVERSE_INULL)
vvv     Null-checking "outp" suggests that it may be null, but it has already been dereferenced on all paths leading to the check.
237     	if (!outp)
238     		return;
240     	mstm = outp->dp.mstm;
241     	NV_DEBUG(drm, "service %s\n", connector->name);

If this is a false positive, please let us know so we can mark it as
such, or teach the Coverity rules to be smarter. If not, please make
sure fixes get into linux-next. :) For patches fixing this, please
include these lines (but double-check the "Fixes" first):

Reported-by: coverity-bot <keescook+coverity-bot@xxxxxxxxxxxx>
Addresses-Coverity-ID: 1527266 ("Null pointer dereferences")
Fixes: a0922278f83e ("drm/nouveau/kms/nv50-: Refactor and cleanup DP HPD handling")

Thanks for your attention!


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