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Message-ID: <32a8c23a-7db9-4b9f-a2e8-cc978a9b8202@kili.mountain>
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;
> }
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