linux-kernel - Re: [PATCH] serial: 8250_lpss: Release Quark MSI vectors on exit

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Date:   Thu, 5 Jan 2017 06:25:46 +0100
From:   Christoph Hellwig <hch@....de>
To:     Jan Kiszka <jan.kiszka@...mens.com>
Cc:     Andy Shevchenko <andy.shevchenko@...il.com>,
        Christoph Hellwig <hch@....de>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        "linux-serial@...r.kernel.org" <linux-serial@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] serial: 8250_lpss: Release Quark MSI vectors on exit

On Wed, Jan 04, 2017 at 11:46:58PM +0100, Jan Kiszka wrote:
> > I NAKed already third patch related to PCI managed resources (couple
> > of those regarding to pci_irq_* API)/
> > 
> 
> Ah, there are resources that are managed without being allocated
> explicitly that way. Hmm, not very intuitive. Are MSI / MSI-X vectors
> the only such cases?

MSI/MSI-X resources are not managed that way and an explicit call to
pci_free_irq_vectors is required from the API standpoint.  It might not
actually free memory in many cases, but it still is a symmetric API.