RE: [PATCH v2 4/4] scsi: ufs: Complete pending requests in host reset and restore path

From: Avri Altman
Date: Mon Nov 18 2019 - 02:21:05 EST

> From: Can Guo <cang@xxxxxxxxxxxxxx>
> In UFS host reset and restore path, before probe, we stop and start the host
> controller once. After host controller is stopped, the pending requests, if any,
> are cleared from the doorbell, but no completion IRQ would be raised due to the
> hba is stopped.
> These pending requests shall be completed along with the first NOP_OUT
> command(as it is the first command which can raise a transfer completion
> IRQ) sent during probe.
> Since the OCSs of these pending requests are not SUCCESS(because they are not
> yet literally finished), their UPIUs shall be dumped. When there are multiple
> pending requests, the UPIU dump can be overwhelming and may lead to
> stability issues because it is in atomic context.
> Therefore, before probe, complete these pending requests right after host
> controller is stopped and silence the UPIU dump from them.
> Signed-off-by: Can Guo <cang@xxxxxxxxxxxxxx>
Already reviewed by Alim & Bean, and tested by Bean.

Please keep those tag updated - will make it clear what is still required to merge this series.