linux-kernel - Re: [char-misc-next] mei: simplify error handling via devres function.

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Message-ID: <CAHp75VdgC=iHtxZ5yRo+8xj8kbvkvqXwiyRQkM81Gp+r5t4BDg@mail.gmail.com>
Date:   Sat, 21 Jan 2017 00:00:07 +0200
From:   Andy Shevchenko <andy.shevchenko@...il.com>
To:     Tomas Winkler <tomas.winkler@...el.com>
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Alexander Usyskin <alexander.usyskin@...el.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
Subject: Re: [char-misc-next] mei: simplify error handling via devres function.

On Fri, Jan 20, 2017 at 7:22 PM, Tomas Winkler <tomas.winkler@...el.com> wrote:
> Use devm_ and pcim_ functions to make error handling
> simpler and code smaller and tidier.
>
> Based on original patch by
> mei: me: use managed functions pcim_* and devm_*
> Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
> https://lkml.org/lkml/2016/2/1/339

Perhaps you may leave SoB.
But let me review the code.

> Cc: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
> Signed-off-by: Tomas Winkler <tomas.winkler@...el.com>
> Signed-off-by: Alexander Usyskin <alexander.usyskin@...el.com>

> - * Return: The mei_device_device pointer on success, NULL on failure.
> + * Return: The mei_device pointer on success, NULL on failure.

This is not related.

> -struct mei_device *mei_me_dev_init(struct pci_dev *pdev,
> -                                  const struct mei_cfg *cfg)
> +struct mei_device *devm_mei_me_init(struct pci_dev *pdev,
> +                                   const struct mei_cfg *cfg)

It's not exactly in devm_ namespace. (They have no corresponding
devm_*_fini, etc.)
Better to leave same name in spite of calling devm_* inside.

> -struct mei_device *mei_txe_dev_init(struct pci_dev *pdev)
> +struct mei_device *devm_mei_txe_init(struct pci_dev *pdev)

Ditto.

>  end:

> +       pci_set_drvdata(pdev, NULL);

Not needed.

>  static void mei_me_remove(struct pci_dev *pdev)
>  {
>         struct mei_device *dev;
> -       struct mei_me_hw *hw;
>
>         dev = pci_get_drvdata(pdev);
>         if (!dev)
> @@ -276,33 +260,19 @@ static void mei_me_remove(struct pci_dev *pdev)
>         if (mei_pg_is_enabled(dev))
>                 pm_runtime_get_noresume(&pdev->dev);

> +       pci_set_drvdata(pdev, NULL);

Ditto.

> -       free_irq(pdev->irq, dev);
> +       devm_free_irq(&pdev->dev, pdev->irq, dev);
>         pci_disable_msi(pdev);

All three not needed

>         return 0;

> @@ -75,22 +64,22 @@ static int mei_txe_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
>  {
>         struct mei_device *dev;
>         struct mei_txe_hw *hw;

> +       const int mask = BIT(SEC_BAR) | BIT(BRIDGE_BAR);

First line?

> +       memcpy(hw->mem_addr, pcim_iomap_table(pdev), sizeof(hw->mem_addr));

Why?
It is kept by PCI core, you don't need a copy.

>  end:

> +       pci_set_drvdata(pdev, NULL);

Redundant.

>  static void mei_txe_remove(struct pci_dev *pdev)
>  {

> +       pci_set_drvdata(pdev, NULL);

Ditto.

> @@ -256,7 +210,7 @@ static int mei_txe_pci_suspend(struct device *device)

> -       free_irq(pdev->irq, dev);
> +       devm_free_irq(&pdev->dev, pdev->irq, dev);
>         pci_disable_msi(pdev);

All are redundant.

-- 
With Best Regards,
Andy Shevchenko