diff options
| author |   Andrew Donnellan <andrew.donnellan@au1.ibm.com> | 2015-09-07 10:52:58 +1000 |
|---|---|---|
| committer |   Michael Ellerman <mpe@ellerman.id.au> | 2015-09-07 20:14:24 +1000 |
| commit | 7d1647dc4ba0a61fec5381c1abb59dc886b6ef3c (patch) | |
| tree | 03bc374595213018d3a2e6cefefb7c8f10dbf7df /drivers/misc/cxl | |
| parent | powerpc/powernv/pci-ioda: fix kdump with non-power-of-2 crashkernel= (diff) | |
| download | linux-dev-7d1647dc4ba0a61fec5381c1abb59dc886b6ef3c.tar.xz linux-dev-7d1647dc4ba0a61fec5381c1abb59dc886b6ef3c.zip | |
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>
Diffstat (limited to 'drivers/misc/cxl')
| -rw-r--r-- | drivers/misc/cxl/vphb.c | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/drivers/misc/cxl/vphb.c b/drivers/misc/cxl/vphb.c index 6dd16a6d153f..94b520896b18 100644 --- a/drivers/misc/cxl/vphb.c +++ b/drivers/misc/cxl/vphb.c @@ -48,6 +48,12 @@ static bool cxl_pci_enable_device_hook(struct pci_dev *dev) phb = pci_bus_to_host(dev->bus); afu = (struct cxl_afu *)phb->private_data; + + if (!cxl_adapter_link_ok(afu->adapter)) { + dev_warn(&dev->dev, "%s: Device link is down, refusing to enable AFU\n", __func__); + return false; + } + set_dma_ops(&dev->dev, &dma_direct_ops); set_dma_offset(&dev->dev, PAGE_OFFSET); |