[PATCH 0/4] hwrng: virtio - add an internal buffer

Laurent Vivier
2021-09-22T17:09:17Z

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.

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 | 84 +++++++++++++++++++++--------
1 file changed, 63 insertions(+), 21 deletions(-)

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2.31.1