Re: [PATCH v4 1/5] block: revert back to synchronous request_queue removal

[Bart Van Assche]

On 2020-05-08 20:10, Luis Chamberlain wrote:
> We revert back to synchronous request_queue removal because asynchronous
> removal creates a regression with expected userspace interaction with
> several drivers. An example is when removing the loopback driver, one
> uses ioctls from userspace to do so, but upon return and if successful,
> one expects the device to be removed. Likewise if one races to add another
> device the new one may not be added as it is still being removed. This was
> expected behavior before and it now fails as the device is still present
> and busy still. Moving to asynchronous request_queue removal could have
> broken many scripts which relied on the removal to have been completed if
> there was no error. Document this expectation as well so that this
> doesn't regress userspace again.

Reviewed-by: Bart Van Assche <bvanassche@xxxxxxx>