Messages in this thread | | | Date | Mon, 22 Feb 2021 23:14:15 +0800 | From | Dejin Zheng <> | Subject | Re: [PATCH v4 1/4] PCI: Introduce pcim_alloc_irq_vectors() |
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On Mon, Feb 22, 2021 at 11:56:08AM +0100, Robert Richter wrote: > On 20.02.21 00:46:49, Dejin Zheng wrote: > > > On 18.02.21 23:04:55, Dejin Zheng wrote: > > > > > + if (!dr || !dr->enabled) > > here checks whether the pci device is enabled. > > What is the purpose of this? The device "is_managed" or not. > The device is managed or not by check whether "dr" is NULL. And check the "dr->enabled" is for the PCI device enable. I think it may not make sense to apply for irq vectors when PCI device is not enabled.
PCI device enable by call pci_enable_device() function, this function initialize device before it's used by a driver. Ask low-level code to enable I/O and memory. Wake up the device if it was suspended.
So I think it might be better to return to failure when it is found the PCI device is not enabled in the pcim_alloc_irq_vectors() function. It can facilitate developers to find problems as soon as possible.
BR, Dejin > -Robert
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