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Date: Mon, 8 Apr 2013 14:04:19 +0300
From: Mika Westerberg <mika.westerberg@...ux.intel.com>
To: Wolfram Sang <wsa@...-dreams.de>
Cc: linux-kernel@...r.kernel.org, linux-i2c@...r.kernel.org,
ben-linux@...ff.org, Jean Delvare <khali@...ux-fr.org>,
Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
Christian Ruppert <christian.ruppert@...lis.com>
Subject: Re: [PATCH 1/7] i2c-designware: move to managed functions (devm_*)
Hi Wolfram,
Any comments on this series? Could you consider merging these for 3.10?
Thanks.
On Thu, Mar 21, 2013 at 02:09:54PM +0200, Mika Westerberg wrote:
> From: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
>
> This makes the error handling much more simpler than open-coding everything
> and in addition makes the probe function smaller and tidier.
>
> Signed-off-by: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
> Signed-off-by: Mika Westerberg <mika.westerberg@...ux.intel.com>
> ---
> drivers/i2c/busses/i2c-designware-platdrv.c | 73 ++++++++-------------------
> 1 file changed, 20 insertions(+), 53 deletions(-)
>
> diff --git a/drivers/i2c/busses/i2c-designware-platdrv.c b/drivers/i2c/busses/i2c-designware-platdrv.c
> index 0ceb6e1..c19c4ce 100644
> --- a/drivers/i2c/busses/i2c-designware-platdrv.c
> +++ b/drivers/i2c/busses/i2c-designware-platdrv.c
> @@ -92,7 +92,7 @@ static int dw_i2c_probe(struct platform_device *pdev)
> {
> struct dw_i2c_dev *dev;
> struct i2c_adapter *adap;
> - struct resource *mem, *ioarea;
> + struct resource *mem;
> int irq, r;
>
> /* NOTE: driver uses the static register mapping */
> @@ -108,32 +108,27 @@ static int dw_i2c_probe(struct platform_device *pdev)
> return irq; /* -ENXIO */
> }
>
> - ioarea = request_mem_region(mem->start, resource_size(mem),
> - pdev->name);
> - if (!ioarea) {
> - dev_err(&pdev->dev, "I2C region already claimed\n");
> - return -EBUSY;
> - }
> + dev = devm_kzalloc(&pdev->dev, sizeof(struct dw_i2c_dev), GFP_KERNEL);
> + if (!dev)
> + return -ENOMEM;
>
> - dev = kzalloc(sizeof(struct dw_i2c_dev), GFP_KERNEL);
> - if (!dev) {
> - r = -ENOMEM;
> - goto err_release_region;
> + dev->base = devm_ioremap_resource(&pdev->dev, mem);
> + if (IS_ERR(dev->base)) {
> + dev_err(&pdev->dev, "I2C region already claimed\n");
> + return PTR_ERR(dev->base);
> }
>
> init_completion(&dev->cmd_complete);
> mutex_init(&dev->lock);
> - dev->dev = get_device(&pdev->dev);
> + dev->dev = &pdev->dev;
> dev->irq = irq;
> platform_set_drvdata(pdev, dev);
>
> - dev->clk = clk_get(&pdev->dev, NULL);
> + dev->clk = devm_clk_get(&pdev->dev, NULL);
> dev->get_clk_rate_khz = i2c_dw_get_clk_rate_khz;
>
> - if (IS_ERR(dev->clk)) {
> - r = -ENODEV;
> - goto err_free_mem;
> - }
> + if (IS_ERR(dev->clk))
> + return PTR_ERR(dev->clk);
> clk_prepare_enable(dev->clk);
>
> dev->functionality =
> @@ -146,13 +141,6 @@ static int dw_i2c_probe(struct platform_device *pdev)
> dev->master_cfg = DW_IC_CON_MASTER | DW_IC_CON_SLAVE_DISABLE |
> DW_IC_CON_RESTART_EN | DW_IC_CON_SPEED_FAST;
>
> - dev->base = ioremap(mem->start, resource_size(mem));
> - if (dev->base == NULL) {
> - dev_err(&pdev->dev, "failure mapping io resources\n");
> - r = -EBUSY;
> - goto err_unuse_clocks;
> - }
> -
> /* Try first if we can configure the device from ACPI */
> r = dw_i2c_acpi_configure(pdev);
> if (r) {
> @@ -164,13 +152,14 @@ static int dw_i2c_probe(struct platform_device *pdev)
> }
> r = i2c_dw_init(dev);
> if (r)
> - goto err_iounmap;
> + return r;
>
> i2c_dw_disable_int(dev);
> - r = request_irq(dev->irq, i2c_dw_isr, IRQF_SHARED, pdev->name, dev);
> + r = devm_request_irq(&pdev->dev, dev->irq, i2c_dw_isr, IRQF_SHARED,
> + pdev->name, dev);
> if (r) {
> dev_err(&pdev->dev, "failure requesting irq %i\n", dev->irq);
> - goto err_iounmap;
> + return r;
> }
>
> adap = &dev->adapter;
> @@ -187,57 +176,35 @@ static int dw_i2c_probe(struct platform_device *pdev)
> r = i2c_add_numbered_adapter(adap);
> if (r) {
> dev_err(&pdev->dev, "failure adding adapter\n");
> - goto err_free_irq;
> + return r;
> }
> of_i2c_register_devices(adap);
> acpi_i2c_register_devices(adap);
>
> + /* Increase reference counter */
> + get_device(&pdev->dev);
> +
> pm_runtime_set_active(&pdev->dev);
> pm_runtime_enable(&pdev->dev);
> pm_runtime_put(&pdev->dev);
>
> return 0;
> -
> -err_free_irq:
> - free_irq(dev->irq, dev);
> -err_iounmap:
> - iounmap(dev->base);
> -err_unuse_clocks:
> - clk_disable_unprepare(dev->clk);
> - clk_put(dev->clk);
> - dev->clk = NULL;
> -err_free_mem:
> - put_device(&pdev->dev);
> - kfree(dev);
> -err_release_region:
> - release_mem_region(mem->start, resource_size(mem));
> -
> - return r;
> }
>
> static int dw_i2c_remove(struct platform_device *pdev)
> {
> struct dw_i2c_dev *dev = platform_get_drvdata(pdev);
> - struct resource *mem;
>
> pm_runtime_get_sync(&pdev->dev);
>
> i2c_del_adapter(&dev->adapter);
> put_device(&pdev->dev);
>
> - clk_disable_unprepare(dev->clk);
> - clk_put(dev->clk);
> - dev->clk = NULL;
> -
> i2c_dw_disable(dev);
> - free_irq(dev->irq, dev);
> - kfree(dev);
>
> pm_runtime_put(&pdev->dev);
> pm_runtime_disable(&pdev->dev);
>
> - mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
> - release_mem_region(mem->start, resource_size(mem));
> return 0;
> }
>
> --
> 1.7.10.4
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