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Message-ID: <20241004182854.3674661-27-sashal@kernel.org>
Date: Fri, 4 Oct 2024 14:28:35 -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 5.15 27/31] 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 10351d5b49fac..41e97c6567cf9 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
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