linux-kernel - [PATCH 5.4 140/141] nvme: do not try to reconfigure APST when the controller is not live

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Message-Id: <20210517140247.543267847@linuxfoundation.org>
Date:   Mon, 17 May 2021 16:03:12 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Peng Liu <liupeng17@...ovo.com>,
        Christoph Hellwig <hch@....de>, Keith Busch <kbusch@...nel.org>
Subject: [PATCH 5.4 140/141] nvme: do not try to reconfigure APST when the controller is not live

From: Christoph Hellwig <hch@....de>

commit 53fe2a30bc168db9700e00206d991ff934973cf1 upstream.

Do not call nvme_configure_apst when the controller is not live, given
that nvme_configure_apst will fail due the lack of an admin queue when
the controller is being torn down and nvme_set_latency_tolerance is
called from dev_pm_qos_hide_latency_tolerance.

Fixes: 510a405d945b("nvme: fix memory leak for power latency tolerance")
Reported-by: Peng Liu <liupeng17@...ovo.com>
Signed-off-by: Christoph Hellwig <hch@....de>
Reviewed-by: Keith Busch <kbusch@...nel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 drivers/nvme/host/core.c |    3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

--- a/drivers/nvme/host/core.c
+++ b/drivers/nvme/host/core.c
@@ -2414,7 +2414,8 @@ static void nvme_set_latency_tolerance(s
 
 	if (ctrl->ps_max_latency_us != latency) {
 		ctrl->ps_max_latency_us = latency;
-		nvme_configure_apst(ctrl);
+		if (ctrl->state == NVME_CTRL_LIVE)
+			nvme_configure_apst(ctrl);
 	}
 }