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fix driver/virtio-blk

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Merged xu_zh requested to merge fix/driver/virtio-blk into main Apr 26, 2023
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Fixes:

  • __free[] is not initialized, causing infinite loop in alloc_desc()
  • desc[0](outhdr).len is wrong, causing "qemu-system-riscv64: virtio-blk request outhdr too short" error
  • __request.pending in not volatile, causing infinite loop in legacy_rw()
Edited Apr 26, 2023 by xu_zh
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Source branch: fix/driver/virtio-blk