6.6-stable review patch. If anyone has any objections, please let me know.
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From: Philip Chen philipchen@chromium.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@chromium.org Message-Id: 20240826215313.2673566-1-philipchen@chromium.org Signed-off-by: Michael S. Tsirkin mst@redhat.com Acked-by: Pankaj Gupta <pankaj.gupta.linux@gmail.com Signed-off-by: Sasha Levin sashal@kernel.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)