pci_msi_vec_count — Return the number of MSI vectors a device can send
|struct pci_dev * dev|
This function returns the number of MSI vectors a device requested via Multiple Message Capable register. It returns a negative errno if the device is not capable sending MSI interrupts. Otherwise, the call succeeds and returns a power of two, up to a maximum of 2^5 (32), according to the MSI specification.