linux-kernel - Re: [PATCH] virtio_pmem: Check device status before requesting flush

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Message-ID: <66c3bf85b52e3_2ddc242941@iweiny-mobl.notmuch>
Date: Mon, 19 Aug 2024 16:56:21 -0500
From: Ira Weiny <ira.weiny@...el.com>
To: Philip Chen <philipchen@...omium.org>, Pankaj Gupta
	<pankaj.gupta.linux@...il.com>, Dan Williams <dan.j.williams@...el.com>,
	Vishal Verma <vishal.l.verma@...el.com>, Dave Jiang <dave.jiang@...el.com>,
	Ira Weiny <ira.weiny@...el.com>
CC: <virtualization@...ts.linux.dev>, <nvdimm@...ts.linux.dev>,
	<linux-kernel@...r.kernel.org>, Philip Chen <philipchen@...omium.org>
Subject: Re: [PATCH] virtio_pmem: Check device status before requesting flush

Philip Chen wrote:
> 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.

I assume this was supposed to be v2 and you resent this as a proper v2
with a change list from v1?

Ira

> 
> Signed-off-by: Philip Chen <philipchen@...omium.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 35c8fbbba10e..3b4d07aa8447 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 send the request to the device if the device is not
> +	 * acticated.
> +	 */
> +	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)
> -- 
> 2.46.0.76.ge559c4bf1a-goog
>