linux-kernel - Re: [PATCH v3 6/6] vfio/nvgpu: register device memory for poison handling

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Date:   Wed, 24 May 2023 12:53:04 +0300
From:   Dan Carpenter <dan.carpenter@...aro.org>
To:     ankita@...dia.com
Cc:     jgg@...dia.com, alex.williamson@...hat.com,
        naoya.horiguchi@....com, maz@...nel.org, oliver.upton@...ux.dev,
        aniketa@...dia.com, cjia@...dia.com, kwankhede@...dia.com,
        targupta@...dia.com, vsethi@...dia.com, acurrid@...dia.com,
        apopple@...dia.com, jhubbard@...dia.com, danw@...dia.com,
        kvm@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, linux-mm@...ck.org
Subject: Re: [PATCH v3 6/6] vfio/nvgpu: register device memory for poison
 handling

On Wed, Apr 05, 2023 at 11:01:34AM -0700, ankita@...dia.com wrote:
> @@ -188,7 +277,20 @@ nvgpu_vfio_pci_fetch_memory_property(struct pci_dev *pdev,
>  
>  	ret = device_property_read_u64(&(pdev->dev), "nvidia,gpu-mem-size",
>  				       &(nvdev->mem_prop.mem_length));
> -	return ret;
> +	if (ret)
> +		return ret;
> +
> +	/*
> +	 * A bitmap is maintained to teack the pages that are poisoned. Each
> +	 * page is represented by a bit. Allocation size in bytes is
> +	 * determined by shifting the device memory size by PAGE_SHIFT to
> +	 * determine the number of pages; and further shifted by 3 as each
> +	 * byte could track 8 pages.
> +	 */
> +	nvdev->mem_prop.pfn_bitmap
> +		= vzalloc(nvdev->mem_prop.mem_length >> (PAGE_SHIFT + 3));

This allocation needs a NULL check.

regards,
dan carpenter

> +
> +	return 0;
>  }