btashton commented on pull request #2039:
URL: https://github.com/apache/incubator-nuttx/pull/2039#issuecomment-712634377
> there is one problem to let user control the buffer size: to support the
hardware FIFO which is very popular on the new accel/gyro sensor model, sensor
upper layer will extend the buffer temporarily to accumulate the bulk data and
shrink the size once the userspace read out the data.
y.
I understand why the FIFO is important, but I think this still can work:
* Track the ref count via the number of open fd on the driver
* If count is 1 allow ioctl to resize the fifo, this would clear the fifo
and resize the underlying malloc
* if count is > 1 then the driver would fail to resize since it is already
in use
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