linux-kernel - [PATCH v2 0/2] nvme-apple: Fix suspend-resume regression

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Message-Id: <20230114-apple-nvme-suspend-fixes-v6.2-v2-0-9157bf633dba@jannau.net>
Date:   Tue, 17 Jan 2023 19:25:00 +0100
From:   Janne Grunau <j@...nau.net>
To:     Hector Martin <marcan@...can.st>, Sven Peter <sven@...npeter.dev>,
        Keith Busch <kbusch@...nel.org>, Jens Axboe <axboe@...com>,
        Christoph Hellwig <hch@....de>,
        Sagi Grimberg <sagi@...mberg.me>
Cc:     Alyssa Rosenzweig <alyssa@...enzweig.io>,
        Eric Curtin <ecurtin@...hat.com>, asahi@...ts.linux.dev,
        linux-arm-kernel@...ts.infradead.org,
        linux-nvme@...ts.infradead.org, linux-kernel@...r.kernel.org,
        Janne Grunau <j@...nau.net>
Subject: [PATCH v2 0/2] nvme-apple: Fix suspend-resume regression

c76b8308e4c9 removed a NVMe controller reset in the shutdown path. This
broke suspend since it triggered a reset on resume. This reset hangs
since the co-processor is not up.
In addition the reset is needed on suspend to shutdown the co-processor
cleanly.

This series contains a functional revert of c76b8308e4c9 (a simple revert
is not possible due to other changes) and issues the NVMe reset only when
the co-processor is running.

Changes since Hector's v1:
- keep the fix localy in nvme-apple
- disable on shutdown for clean co-processor shutdown
- disable on reset only while the co-processor is running

---
Janne Grunau (2):
      nvme-apple: Reset controller during shutdown
      nvme-apple: Only reset the controller when RTKit is running

 drivers/nvme/host/apple.c | 14 ++++++++++----
 1 file changed, 10 insertions(+), 4 deletions(-)
---
base-commit: 5dc4c995db9eb45f6373a956eb1f69460e69e6d4
change-id: 20230114-apple-nvme-suspend-fixes-v6.2-rc4

Best regards,
-- 
Janne Grunau <j@...nau.net>