tree 03bc374595213018d3a2e6cefefb7c8f10dbf7df
parent fa14486979b3a47307bcdb10f8b5baa875a5cf68
author Andrew Donnellan <andrew.donnellan@au1.ibm.com> 1441587178 +1000
committer Michael Ellerman <mpe@ellerman.id.au> 1441620864 +1000

cxl: abort cxl_pci_enable_device_hook() if PCI channel is offline

cxl_pci_enable_device_hook() is called when attempting to enable an AFU
sitting on a vPHB. At present, the state of the underlying CXL card's PCI
channel is only checked when it calls cxl_afu_check_and_enable() at the
very end, after it has already set DMA options and initialised a default
context.

Check the CXL card's link status before setting DMA options or initialising
a default context. If the link is down, print a warning and return
immediately.

Signed-off-by: Andrew Donnellan <andrew.donnellan@au1.ibm.com>
Acked-by: Ian Munsie <imunsie@au1.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>