On Sun, 2017-01-08 at 02:24 -0800, Christoph Hellwig wrote:

On Thu, Jan 05, 2017 at 12:19:56AM +0200, Andy Shevchenko wrote:

quoted

NAK, check the PCI devres code, please.

+Cc: Tejun, Bjorn.

Releasing something through devres that wasn't allocated using a
devm_* or
pcim_* function isn't expected, and we should fix that instead.
pci_free_irq_vectors is _currently_ implemented by calling
pci_disable_msi and pci_disable_msix, but there is no guarantee for
that
in the API.

Your code works by accident, not by design.  If you want the resources
to be auto-released you need to add a proper pcim_alloc_irq_vectors
API.

Though idea sounds sane I disagree this is accidental. The PCI managed
introduction includes among other this one:

+  pcim_enable_device() : after success, all PCI ops become managed

As per commit 9ac7849e35f7 ("devres: device resource management").

Thus, I suppose a new API should follow existing design, or provide a
sane fix. I briefly checked MSI/-X usage and since I'm not so familiar
with the PCI core code, I wouldn't be brave to break it.

Currently I suspect pci_free_irq_vectors() is not friendly with
pcim_release().

-- 
Andy Shevchenko [off-list ref]
Intel Finland Oy