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 <philipc...@chromium.org>
---
v3:
- Fix a typo in the comment (s/acticated/activated/)
v2:
- Remove change id from the patch description
- Add more details to the patch description
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 35c8fbbba10e..f55d60922b87 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)
--
2.46.0.295.g3b9ea8a38a-goog
