[PATCH 1/7] cxlflash: Simplify PCI registration

[Matthew R. Ochs]

> On Mar 4, 2016, at 3:55 PM, Uma Krishnan <ukrishn at linux.vnet.ibm.com> wrote:
> 
> From: "Manoj N. Kumar" <manoj at linux.vnet.ibm.com>
> 
> The calls to pci_request_regions(), pci_resource_start(),
> pci_set_dma_mask(), pci_set_master() and pci_save_state() are all
> unnecessary for the IBM CXL flash adapter since data buffers
> are not required to be mapped to the device's memory.
> 
> The use of services such as pci_set_dma_mask() are problematic on
> hypervisor managed systems as the IBM CXL flash adapter is operating
> under a virtual PCI Host Bridge (virtual PHB) which does not support
> these services.
> 
> cxlflash 0001:00:00.0: init_pci: Failed to set PCI DMA mask rc=-5
> 
> The resolution is to simplify init_pci(), to a point where it does the
> bare minimum (pci_enable_device). Similarly, remove the call the
> pci_release_regions() from cxlflash_remove().
> 
> Signed-off-by: Manoj N. Kumar <manoj at linux.vnet.ibm.com>

Acked-by: Matthew R. Ochs <mrochs at linux.vnet.ibm.com>