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virtio: Make avail and used ring pointers volatile

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The contents of those descriptor rings can be modified by the device.
Mark them as volatile so the compiler does not make any assumptions
about them.

Issue #4264
This commit is contained in:
Piotr Tworek 2021-01-13 21:43:40 +01:00 committed by Norman Feske
parent c0a7696c71
commit b7f66626c2
1 changed files with 2 additions and 2 deletions
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repos/os/include/virtio/queue.h
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@ -121,8 +121,8 @@ class Virtio::Queue
Genode::uint16_t const _buffer_size;
Genode::Attached_ram_dataspace _ram_ds;
Descriptor *_desc_table = nullptr;
Avail *_avail = nullptr;
Used *_used = nullptr;
Avail volatile *_avail = nullptr;
Used volatile *_used = nullptr;
Genode::addr_t _buffer_phys_base = 0;
Genode::addr_t _buffer_local_base = 0;
Genode::uint16_t _last_used_idx = 0;