On Tue, Sep 23, 2014 at 06:20:46PM +0530, Kiran Padwal wrote:
> This change uses managed resource APIs to allocate resources such as,
> mem, irq in order to simplify the driver unload or failure cases.
>
> Signed-off-by: Kiran Padwal <kiran.padwal@xxxxxxxxxxxxxxx>
> ---
> drivers/dma/cppi41.c | 15 ++++-----------
> 1 file changed, 4 insertions(+), 11 deletions(-)
>
> diff --git a/drivers/dma/cppi41.c b/drivers/dma/cppi41.c
> index 5921ce3..d3700fb 100644
> --- a/drivers/dma/cppi41.c
> +++ b/drivers/dma/cppi41.c
> @@ -938,7 +938,7 @@ static int cppi41_dma_probe(struct platform_device *pdev)
> if (!glue_info)
> return -EINVAL;
>
> - cdd = kzalloc(sizeof(*cdd), GFP_KERNEL);
> + cdd = devm_kzalloc(&pdev->dev, sizeof(*cdd), GFP_KERNEL);
> if (!cdd)
> return -ENOMEM;
>
> @@ -959,10 +959,8 @@ static int cppi41_dma_probe(struct platform_device *pdev)
> cdd->qmgr_mem = of_iomap(dev->of_node, 3);
>
> if (!cdd->usbss_mem || !cdd->ctrl_mem || !cdd->sched_mem ||
> - !cdd->qmgr_mem) {
> - ret = -ENXIO;
> - goto err_remap;
> - }
> + !cdd->qmgr_mem)
> + return -ENXIO;
>
> pm_runtime_enable(dev);
> ret = pm_runtime_get_sync(dev);
> @@ -989,7 +987,7 @@ static int cppi41_dma_probe(struct platform_device *pdev)
>
> cppi_writel(USBSS_IRQ_PD_COMP, cdd->usbss_mem + USBSS_IRQ_ENABLER);
>
> - ret = request_irq(irq, glue_info->isr, IRQF_SHARED,
> + ret = devm_request_irq(&pdev->dev, irq, glue_info->isr, IRQF_SHARED,
> dev_name(dev), cdd);
> if (ret)
> goto err_irq;
> @@ -1009,7 +1007,6 @@ static int cppi41_dma_probe(struct platform_device *pdev)
> err_of:
> dma_async_device_unregister(&cdd->ddev);
> err_dma_reg:
> - free_irq(irq, cdd);
> err_irq:
> cppi_writel(0, cdd->usbss_mem + USBSS_IRQ_CLEARR);
> cleanup_chans(cdd);
> @@ -1023,8 +1020,6 @@ err_get_sync:
> iounmap(cdd->ctrl_mem);
> iounmap(cdd->sched_mem);
> iounmap(cdd->qmgr_mem);
> -err_remap:
> - kfree(cdd);
> return ret;
> }
>
> @@ -1036,7 +1031,6 @@ static int cppi41_dma_remove(struct platform_device *pdev)
> dma_async_device_unregister(&cdd->ddev);
>
> cppi_writel(0, cdd->usbss_mem + USBSS_IRQ_CLEARR);
> - free_irq(cdd->irq, cdd);
pls use devm_free_irq() explicitly here, other wise your controller is active and able
to send interrupts and driver object is getting removed. It is the role of
driver to quiesce device before releasing
--
~Vinod
> cleanup_chans(cdd);
> deinit_cppi41(&pdev->dev, cdd);
> iounmap(cdd->usbss_mem);
> @@ -1045,7 +1039,6 @@ static int cppi41_dma_remove(struct platform_device *pdev)
> iounmap(cdd->qmgr_mem);
> pm_runtime_put(&pdev->dev);
> pm_runtime_disable(&pdev->dev);
> - kfree(cdd);
> return 0;
> }
>
> --
> 1.7.9.5
>
--
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