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drm/virtio: Add memory barriers for capset cache.

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After data is copied to the cache entry, atomic_set is used indicate
that the data is the entry is valid without appropriate memory barriers.
Similarly the read side was missing the corresponding memory barriers.

Signed-off-by: David Riley <davidriley@chromium.org>
Link: http://patchwork.freedesktop.org/patch/msgid/20190610211810.253227-5-davidriley@chromium.org
Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
This commit is contained in:
David Riley
2019-06-10 14:18:10 -07:00
committed by Gerd Hoffmann
parent 47b757fba2
commit 9ff3a5c88e
2 changed files with 5 additions and 0 deletions
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3
drivers/gpu/drm/virtio/virtgpu_ioctl.c
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@@ -540,6 +540,9 @@ copy_exit:
if (!ret)
return -EBUSY;
/* is_valid check must proceed before copy of the cache entry. */
smp_rmb();
ptr = cache_ent->caps_cache;
if (copy_to_user(u64_to_user_ptr(args->addr), ptr, size))