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gpu: fix parsing of third descriptor in chain

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Descriptor chains of three descriptors were not having the last
descriptor parsed correctly which resulted in some commands not
properly being responded to.

BUG=None
TEST=build with --features=gpu; null_platform_test

Change-Id: Ia77c7ca485ded7cdcb71fd62e8f6be5c226df1bf
Reviewed-on: https://chromium-review.googlesource.com/1073956
Commit-Ready: David Riley <davidriley@chromium.org>
Tested-by: David Riley <davidriley@chromium.org>
Reviewed-by: Zach Reizner <zachr@chromium.org>
This commit is contained in:
David Riley 2018-05-22 15:37:22 -07:00 committed by chrome-bot
parent e9717c4b7b
commit 1187595da3
1 changed files with 4 additions and 4 deletions
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8
devices/src/virtio/gpu/mod.rs
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@ -301,10 +301,10 @@ impl Frontend {
} else {
q_desc.data = Some((extra_desc.addr, extra_desc.len));
}
}
if let Some(extra_desc) = desc.next_descriptor() {
if extra_desc.is_write_only() && q_desc.ret.is_none() {
q_desc.ret = Some((extra_desc.addr, extra_desc.len));
if let Some(extra_desc) = extra_desc.next_descriptor() {
if extra_desc.is_write_only() && q_desc.ret.is_none() {
q_desc.ret = Some((extra_desc.addr, extra_desc.len));
}
}
}
descriptors.push_back(q_desc);