Re: pci_alloc_irq_vectors use in 8250_lpss.c

From: Andy Shevchenko
Date: Sun Oct 09 2016 - 18:20:31 EST

On Mon, Oct 10, 2016 at 1:01 AM, Andy Shevchenko
<andy.shevchenko@xxxxxxxxx> wrote:
> On Sun, Oct 9, 2016 at 8:56 PM, Christoph Hellwig <hch@xxxxxx> wrote:
>> Hi Andy,
>> two comment on your ãatch to add MSI support to the above driver.
>> First pci_alloc_irq_vectors gained a mandatory flags argument, so
>> for MSI suport you now need to pass PCI_IRQ_MSI in flags for the
>> code to work.
> I will check this. Thanks for pointing to it.

Yeah, this has to be amended.

>> Second please make sure to always pair pci_alloc_irq_vectors
>> with pci_free_irq_vectors on the remove path.
> For my opinion it should be done in PCI code since I'm using
> manageable resources. It's already done for all PCI API usually used
> at ->probe().

Nothing is required to do until you don't use some specific code. If
you plan extend *_free_*() function in the future, please, consider
manageable resources and automatic releasing.

With Best Regards,
Andy Shevchenko