netdev - Re: [patch net-next 2/4] mlxsw: Add PCI bus implementation

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Date:	Sat, 25 Jul 2015 22:15:04 -0700
From:	Scott Feldman <sfeldma@...il.com>
To:	Jiri Pirko <jiri@...nulli.us>
Cc:	Netdev <netdev@...r.kernel.org>,
	"David S. Miller" <davem@...emloft.net>, idosch@...lanox.com,
	eladr@...lanox.com,
	"ogerlitz@...lanox.com" <ogerlitz@...lanox.com>,
	Roopa Prabhu <roopa@...ulusnetworks.com>,
	Florian Fainelli <f.fainelli@...il.com>,
	Thomas Graf <tgraf@...g.ch>,
	Alexei Starovoitov <ast@...mgrid.com>,
	Jamal Hadi Salim <jhs@...atatu.com>,
	Daniel Borkmann <daniel@...earbox.net>,
	john fastabend <john.fastabend@...il.com>,
	"simon.horman@...ronome.com" <simon.horman@...ronome.com>,
	John Linville <linville@...driver.com>,
	Andy Gospodarek <andy@...yhouse.net>,
	Shrijeet Mukherjee <shm@...ulusnetworks.com>,
	"nhorman@...driver.com" <nhorman@...driver.com>,
	Jiri Pirko <jiri@...lanox.com>
Subject: Re: [patch net-next 2/4] mlxsw: Add PCI bus implementation

On Thu, Jul 23, 2015 at 8:43 AM, Jiri Pirko <jiri@...nulli.us> wrote:
> From: Jiri Pirko <jiri@...lanox.com>
>
> Add PCI bus implementation for Mellanox Technologies Switch ASICs. This
> includes firmware initialization, async queues manipulation and command
> interface implementation.
>
> Signed-off-by: Jiri Pirko <jiri@...lanox.com>
> Signed-off-by: Ido Schimmel <idosch@...lanox.com>
> Signed-off-by: Elad Raz <eladr@...lanox.com>
> ---

[cut]

> +static int mlxsw_pci_fw_area_init(struct mlxsw_pci *mlxsw_pci, char *mbox,
> +                                 u16 num_pages)
> +{
> +       struct mlxsw_pci_mem_item *mem_item;
> +       int i;
> +       int err;

Need to init err to zero here

> +
> +       mlxsw_pci->fw_area.items = kcalloc(num_pages, sizeof(*mem_item),
> +                                          GFP_KERNEL);
> +       if (!mlxsw_pci->fw_area.items)
> +               return -ENOMEM;
> +       mlxsw_pci->fw_area.num_pages = num_pages;
> +
> +       mlxsw_cmd_mbox_zero(mbox);
> +       for (i = 0; i < num_pages; i++) {
> +               mem_item = &mlxsw_pci->fw_area.items[i];
> +
> +               mem_item->size = MLXSW_PCI_PAGE_SIZE;
> +               mem_item->buf = pci_alloc_consistent(mlxsw_pci->pdev,
> +                                                    mem_item->size,
> +                                                    &mem_item->mapaddr);
> +               if (!mem_item->buf)
> +                       goto err_alloc;
> +               mlxsw_cmd_mbox_map_fa_pa_set(mbox, i, mem_item->mapaddr);
> +               mlxsw_cmd_mbox_map_fa_log2size_set(mbox, i, 0); /* 1 page */
> +       }
> +
> +       err = mlxsw_cmd_map_fa(mlxsw_pci->core, mbox, num_pages);
> +       if (err)
> +               goto err_cmd_map_fa;
> +
> +       return 0;
> +
> +err_cmd_map_fa:
> +err_alloc:
> +       for (i--; i >= 0; i--) {
> +               mem_item = &mlxsw_pci->fw_area.items[i];
> +
> +               pci_free_consistent(mlxsw_pci->pdev, mem_item->size,
> +                                   mem_item->buf, mem_item->mapaddr);
> +       }
> +       kfree(mlxsw_pci->fw_area.items);
> +       return err;
> +}
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