linux-kernel - [PATCH AUTOSEL 6.6 48/58] virtio_pmem: Check device status before requesting flush

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Message-ID: <20241004182503.3672477-48-sashal@kernel.org>
Date: Fri,  4 Oct 2024 14:24:21 -0400
From: Sasha Levin <sashal@...nel.org>
To: linux-kernel@...r.kernel.org,
	stable@...r.kernel.org
Cc: Philip Chen <philipchen@...omium.org>,
	"Michael S . Tsirkin" <mst@...hat.com>,
	Sasha Levin <sashal@...nel.org>,
	pankaj.gupta.linux@...il.com,
	dan.j.williams@...el.com,
	vishal.l.verma@...el.com,
	dave.jiang@...el.com,
	ira.weiny@...el.com,
	virtualization@...ts.linux.dev,
	nvdimm@...ts.linux.dev
Subject: [PATCH AUTOSEL 6.6 48/58] virtio_pmem: Check device status before requesting flush

From: Philip Chen <philipchen@...omium.org>

[ Upstream commit e25fbcd97cf52c3c9824d44b5c56c19673c3dd50 ]

If a pmem device is in a bad status, the driver side could wait for
host ack forever in virtio_pmem_flush(), causing the system to hang.

So add a status check in the beginning of virtio_pmem_flush() to return
early if the device is not activated.

Signed-off-by: Philip Chen <philipchen@...omium.org>
Message-Id: <20240826215313.2673566-1-philipchen@...omium.org>
Signed-off-by: Michael S. Tsirkin <mst@...hat.com>
Acked-by: Pankaj Gupta <pankaj.gupta.linux@...il.com
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/nvdimm/nd_virtio.c | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/drivers/nvdimm/nd_virtio.c b/drivers/nvdimm/nd_virtio.c
index 1f8c667c6f1ee..839f10ca56eac 100644
--- a/drivers/nvdimm/nd_virtio.c
+++ b/drivers/nvdimm/nd_virtio.c
@@ -44,6 +44,15 @@ static int virtio_pmem_flush(struct nd_region *nd_region)
 	unsigned long flags;
 	int err, err1;
 
+	/*
+	 * Don't bother to submit the request to the device if the device is
+	 * not activated.
+	 */
+	if (vdev->config->get_status(vdev) & VIRTIO_CONFIG_S_NEEDS_RESET) {
+		dev_info(&vdev->dev, "virtio pmem device needs a reset\n");
+		return -EIO;
+	}
+
 	might_sleep();
 	req_data = kmalloc(sizeof(*req_data), GFP_KERNEL);
 	if (!req_data)
-- 
2.43.0