linux-kernel - [PATCH AUTOSEL 6.1 26/35] nvme-apple: only reset the controller when RTKit is running

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Message-Id: <20230124134131.637036-26-sashal@kernel.org>
Date:   Tue, 24 Jan 2023 08:41:22 -0500
From:   Sasha Levin <sashal@...nel.org>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:     Janne Grunau <j@...nau.net>, Christoph Hellwig <hch@....de>,
        Sasha Levin <sashal@...nel.org>, marcan@...can.st,
        sven@...npeter.dev, kbusch@...nel.org, axboe@...com,
        sagi@...mberg.me, asahi@...ts.linux.dev,
        linux-arm-kernel@...ts.infradead.org,
        linux-nvme@...ts.infradead.org
Subject: [PATCH AUTOSEL 6.1 26/35] nvme-apple: only reset the controller when RTKit is running

From: Janne Grunau <j@...nau.net>

[ Upstream commit c0a4a1eafbd48e02829045bba3e6163c03037276 ]

NVMe controller register access hangs indefinitely when the co-processor
is not running. A missed reset is preferable over a hanging thread since
it could be recoverable.

Signed-off-by: Janne Grunau <j@...nau.net>
Signed-off-by: Christoph Hellwig <hch@....de>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/nvme/host/apple.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/drivers/nvme/host/apple.c b/drivers/nvme/host/apple.c
index ff8b083dc5c6..262d2b60ac6d 100644
--- a/drivers/nvme/host/apple.c
+++ b/drivers/nvme/host/apple.c
@@ -987,11 +987,11 @@ static void apple_nvme_reset_work(struct work_struct *work)
 		goto out;
 	}
 
-	if (anv->ctrl.ctrl_config & NVME_CC_ENABLE)
-		apple_nvme_disable(anv, false);
-
 	/* RTKit must be shut down cleanly for the (soft)-reset to work */
 	if (apple_rtkit_is_running(anv->rtk)) {
+		/* reset the controller if it is enabled */
+		if (anv->ctrl.ctrl_config & NVME_CC_ENABLE)
+			apple_nvme_disable(anv, false);
 		dev_dbg(anv->dev, "Trying to shut down RTKit before reset.");
 		ret = apple_rtkit_shutdown(anv->rtk);
 		if (ret)
-- 
2.39.0