[ Upstream commit 1396500d673bd027683a0609ff84dca7eb6ea2e7 ]
The devcoredump needs to operate on a stable state of the MMU while it is writing the MMU state to the coredump. The missing lock allowed both the userspace submit, as well as the GPU job finish paths to mutate the MMU state while a coredump is under way.
Fixes: a8c21a5451d8 (drm/etnaviv: add initial etnaviv DRM driver) Reported-by: David Jander david@protonic.nl Signed-off-by: Lucas Stach l.stach@pengutronix.de Tested-by: David Jander david@protonic.nl Reviewed-by: Philipp Zabel p.zabel@pengutronix.de Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/gpu/drm/etnaviv/etnaviv_dump.c | 5 +++++ 1 file changed, 5 insertions(+)
diff --git a/drivers/gpu/drm/etnaviv/etnaviv_dump.c b/drivers/gpu/drm/etnaviv/etnaviv_dump.c index 33854c94cb85..515515ef24f9 100644 --- a/drivers/gpu/drm/etnaviv/etnaviv_dump.c +++ b/drivers/gpu/drm/etnaviv/etnaviv_dump.c @@ -125,6 +125,8 @@ void etnaviv_core_dump(struct etnaviv_gpu *gpu) return; etnaviv_dump_core = false;
+ mutex_lock(&gpu->mmu->lock); + mmu_size = etnaviv_iommu_dump_size(gpu->mmu);
/* We always dump registers, mmu, ring and end marker */ @@ -167,6 +169,7 @@ void etnaviv_core_dump(struct etnaviv_gpu *gpu) iter.start = __vmalloc(file_size, GFP_KERNEL | __GFP_NOWARN | __GFP_NORETRY, PAGE_KERNEL); if (!iter.start) { + mutex_unlock(&gpu->mmu->lock); dev_warn(gpu->dev, "failed to allocate devcoredump file\n"); return; } @@ -234,6 +237,8 @@ void etnaviv_core_dump(struct etnaviv_gpu *gpu) obj->base.size); }
+ mutex_unlock(&gpu->mmu->lock); + etnaviv_core_dump_header(&iter, ETDUMP_BUF_END, iter.data);
dev_coredumpv(gpu->dev, iter.start, iter.data - iter.start, GFP_KERNEL);