linux-kernel - [PATCH 1/2] nvme-apple: Do not try to shut down the controller twice

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Message-Id: <20230111043614.27087-2-marcan@marcan.st>
Date:   Wed, 11 Jan 2023 13:36:13 +0900
From:   Hector Martin <marcan@...can.st>
To:     Keith Busch <kbusch@...nel.org>, Jens Axboe <axboe@...com>,
        Christoph Hellwig <hch@....de>,
        Sagi Grimberg <sagi@...mberg.me>
Cc:     Eric Curtin <ecurtin@...hat.com>, Janne Grunau <j@...nau.net>,
        Sven Peter <sven@...npeter.dev>,
        Alyssa Rosenzweig <alyssa@...enzweig.io>,
        asahi@...ts.linux.dev, linux-arm-kernel@...ts.infradead.org,
        linux-nvme@...ts.infradead.org, linux-kernel@...r.kernel.org,
        Hector Martin <marcan@...can.st>
Subject: [PATCH 1/2] nvme-apple: Do not try to shut down the controller twice

The blamed commit stopped explicitly disabling the controller when we do
a controlled shutdown, but apple_nvme_reset_work was only checking for
the disable bit before deciding to issue another disable. Check for the
shutdown state too, to avoid breakage.

This issue does not affect nvme-pci, since it only issues controller
shutdowns when the system is actually shutting down anyway.

Fixes: c76b8308e4c9 ("nvme-apple: fix controller shutdown in apple_nvme_disable")
Signed-off-by: Hector Martin <marcan@...can.st>
---
 drivers/nvme/host/apple.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/nvme/host/apple.c b/drivers/nvme/host/apple.c
index e13a992b6096..1961376447dc 100644
--- a/drivers/nvme/host/apple.c
+++ b/drivers/nvme/host/apple.c
@@ -1023,7 +1023,8 @@ static void apple_nvme_reset_work(struct work_struct *work)
 		goto out;
 	}
 
-	if (anv->ctrl.ctrl_config & NVME_CC_ENABLE)
+	if (anv->ctrl.ctrl_config & NVME_CC_ENABLE &&
+	    !(anv->ctrl.ctrl_config & NVME_CC_SHN_MASK))
 		apple_nvme_disable(anv, false);
 
 	/* RTKit must be shut down cleanly for the (soft)-reset to work */
-- 
2.35.1