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[v4,0/4] Introduce pcim_alloc_irq_vectors()

Message ID 20210218150458.798347-1-zhengdejin5@gmail.com
Headers show
Series Introduce pcim_alloc_irq_vectors() | expand

Message

Dejin Zheng Feb. 18, 2021, 3:04 p.m. UTC 
Introduce pcim_alloc_irq_vectors(), a device-managed version of
pci_alloc_irq_vectors(), In some i2c drivers, If pcim_enable_device()
has been called before, then pci_alloc_irq_vectors() is actually a
device-managed function. It is used as a device-managed function, So
replace it with pcim_alloc_irq_vectors().

Changelog
---------
v3 -> v4:
	- add some commit comments for patch 3
v2 -> v3:
	- Add some commit comments for replace some codes in
	  pcim_release() by pci_free_irq_vectors().
	- Simplify the error handling path in i2c designware
	  driver.
v1 -> v2:
	- Use pci_free_irq_vectors() to replace some code in
	  pcim_release().
	- Modify some commit messages.

Dejin Zheng (4):
  PCI: Introduce pcim_alloc_irq_vectors()
  Documentation: devres: Add pcim_alloc_irq_vectors()
  i2c: designware: Use the correct name of device-managed function
  i2c: thunderx: Use the correct name of device-managed function

 .../driver-api/driver-model/devres.rst        |  1 +
 drivers/i2c/busses/i2c-designware-pcidrv.c    | 15 +++------
 drivers/i2c/busses/i2c-thunderx-pcidrv.c      |  2 +-
 drivers/pci/pci.c                             | 33 ++++++++++++++++---
 include/linux/pci.h                           |  3 ++
 5 files changed, 38 insertions(+), 16 deletions(-)

Comments

Andy Shevchenko Feb. 18, 2021, 3:35 p.m. UTC | #1 
On Thu, Feb 18, 2021 at 11:04:57PM +0800, Dejin Zheng wrote:
> Use the new function pcim_alloc_irq_vectors() to allocate IRQ vectors,
> the pcim_alloc_irq_vectors() function, an explicit device-managed version
> of pci_alloc_irq_vectors(). If pcim_enable_device() has been called
> before, then pci_alloc_irq_vectors() is actually a device-managed
> function. It is used here as a device-managed function, So replace it
> with pcim_alloc_irq_vectors(). At the same time, Remove the
> pci_free_irq_vectors() function to simplify the error handling path.
> the freeing resources will take automatically when device is gone.

Acked-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
One side note below.

> Signed-off-by: Dejin Zheng <zhengdejin5@gmail.com>
> ---
> v3 -> v4:
> 	- add some commit comments.
> v2 -> v3:
> 	- simplify the error handling path.
> v1 -> v2:
> 	- Modify some commit messages.
>  drivers/i2c/busses/i2c-designware-pcidrv.c | 15 ++++-----------
>  1 file changed, 4 insertions(+), 11 deletions(-)
> 
> diff --git a/drivers/i2c/busses/i2c-designware-pcidrv.c b/drivers/i2c/busses/i2c-designware-pcidrv.c
> index 55c83a7a24f3..620b41e373b6 100644
> --- a/drivers/i2c/busses/i2c-designware-pcidrv.c
> +++ b/drivers/i2c/busses/i2c-designware-pcidrv.c
> @@ -219,7 +219,7 @@ static int i2c_dw_pci_probe(struct pci_dev *pdev,
>  	if (!dev)
>  		return -ENOMEM;
>  
> -	r = pci_alloc_irq_vectors(pdev, 1, 1, PCI_IRQ_ALL_TYPES);
> +	r = pcim_alloc_irq_vectors(pdev, 1, 1, PCI_IRQ_ALL_TYPES);
>  	if (r < 0)
>  		return r;
>  
> @@ -234,10 +234,8 @@ static int i2c_dw_pci_probe(struct pci_dev *pdev,
>  
>  	if (controller->setup) {
>  		r = controller->setup(pdev, controller);
> -		if (r) {
> -			pci_free_irq_vectors(pdev);
> +		if (r)
>  			return r;
> -		}
>  	}
>  
>  	i2c_dw_adjust_bus_speed(dev);
> @@ -246,10 +244,8 @@ static int i2c_dw_pci_probe(struct pci_dev *pdev,
>  		i2c_dw_acpi_configure(&pdev->dev);
>  
>  	r = i2c_dw_validate_speed(dev);
> -	if (r) {
> -		pci_free_irq_vectors(pdev);
> +	if (r)
>  		return r;
> -	}
>  
>  	i2c_dw_configure(dev);
>  
> @@ -269,10 +265,8 @@ static int i2c_dw_pci_probe(struct pci_dev *pdev,
>  	adap->nr = controller->bus_num;
>  
>  	r = i2c_dw_probe(dev);
> -	if (r) {
> -		pci_free_irq_vectors(pdev);
> +	if (r)
>  		return r;
> -	}
>  
>  	pm_runtime_set_autosuspend_delay(&pdev->dev, 1000);
>  	pm_runtime_use_autosuspend(&pdev->dev);
> @@ -292,7 +286,6 @@ static void i2c_dw_pci_remove(struct pci_dev *pdev)
>  
>  	i2c_del_adapter(&dev->adapter);
>  	devm_free_irq(&pdev->dev, dev->irq, dev);
> -	pci_free_irq_vectors(pdev);

I'm wondering if we need explicit devm_free_irq() call now. If we don't, it can
be cleaned up in the separate change with a motivation that we got to device
managed PCI IRQ allocation and thus the ordering will be correct (needs a
double check!).

>  }
>  
>  /* work with hotplug and coldplug */
> -- 
> 2.25.0
>