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Subject[PATCH v2 0/4] hwrng: virtio - add an internal buffer
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hwrng core uses two buffers that can be mixed in the virtio-rng queue.

This series fixes the problem by adding an internal buffer in virtio-rng.

Once the internal buffer is added, we can fix two other problems:

- to be able to release the driver without waiting the device releases the
buffer

- actually returns some data when wait=0 as we can have some already
available data

It also tries to improve the performance by always having a buffer in
the queue of the device.

v2:
fixes issue reported by syzbot+b86736b5935e0d25b446@syzkaller.appspotmail.com
by reseting data_idx to 0 when the buffer is submitted not when it is
received as the consumer checks for data_avail, not only for the completion.

Laurent Vivier (4):
hwrng: virtio - add an internal buffer
hwrng: virtio - don't wait on cleanup
hwrng: virtio - don't waste entropy
hwrng: virtio - always add a pending request

drivers/char/hw_random/virtio-rng.c | 86 ++++++++++++++++++++++-------
1 file changed, 65 insertions(+), 21 deletions(-)

--
2.31.1


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