linux-kernel - Re: [PATCH 1/1] NVMe : Corrected memory freeing.

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Date:	Wed, 17 Jun 2015 16:24:56 +0000 (UTC)
From:	Keith Busch <keith.busch@...el.com>
To:	Dheepthi K <dheepthi.s@...celabs.com>
cc:	Matthew Wilcox <willy@...ux.intel.com>,
	linux-nvme@...ts.infradead.org, linux-kernel@...r.kernel.org,
	madhu@...celabs.com
Subject: Re: [PATCH 1/1] NVMe : Corrected memory freeing.

On Wed, 17 Jun 2015, Dheepthi K wrote:
> Memory freeing order has been corrected incase of
> allocation failure.

This isn't necessary. The nvme_dev is zero'ed on allocation, and
kfree(NULL or (void *)0) is okay to do.


> Signed-off-by: Dheepthi K <dheepthi.s@...celabs.com>
> ---
> drivers/block/nvme-core.c |    7 ++++---
> 1 file changed, 4 insertions(+), 3 deletions(-)
>
> diff --git a/drivers/block/nvme-core.c b/drivers/block/nvme-core.c
> index 683dff2..9bac53b 100644
> --- a/drivers/block/nvme-core.c
> +++ b/drivers/block/nvme-core.c
> @@ -2947,11 +2947,11 @@ static int nvme_probe(struct pci_dev *pdev, const struct pci_device_id *id)
> 	dev->entry = kzalloc_node(num_possible_cpus() * sizeof(*dev->entry),
> 							GFP_KERNEL, node);
> 	if (!dev->entry)
> -		goto free;
> +		goto free_dev;
> 	dev->queues = kzalloc_node((num_possible_cpus() + 1) * sizeof(void *),
> 							GFP_KERNEL, node);
> 	if (!dev->queues)
> -		goto free;
> +		goto free_entry;
>
> 	INIT_LIST_HEAD(&dev->namespaces);
> 	dev->reset_workfn = nvme_reset_failed_dev;
> @@ -2987,9 +2987,10 @@ static int nvme_probe(struct pci_dev *pdev, const struct pci_device_id *id)
> 	nvme_release_instance(dev);
>  put_pci:
> 	pci_dev_put(dev->pci_dev);
> - free:
> 	kfree(dev->queues);
> + free_entry:
> 	kfree(dev->entry);
> + free_dev:
> 	kfree(dev);
> 	return result;
> }
--
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