scsi: qla2xxx: Handle INTx not connected while passing through

The PCI_INTERRUPT_PIN reports if the device supports the INTx.  However,
when the device is assigned to a guest via vfio, the PCI_INTERRUPT_PIN
is set to 0 (i.e none) if the line is not connected and/or the platform
cannot route the interrupt.

In such cases, the guest PCI_INTERRUPT_PIN is 0 and the port number
becomes -1 (255, uint8_t underflow) for qla[25|27|28]xx and qla2031
devices.  The flt_region_nvram is never set, and subsequently the LUN
detection fails.  Below warnings show the NVRAM configuration failure:

 []-0073:1: Inconsistent NVRAM checksum=0xffffffc0 id=HCAM version=0x100.
 []-0074:1: Falling back to functioning (yet invalid -- WWPN) defaults.
 []-0076:1: NVRAM configuration failed.

Handle this case and set the port_no to devfn like its done everywhere
else.

Reference: commit 2bd42b03ab6b ("vfio/pci: Virtualize zero INTx PIN if no pdev->irq")
Signed-off-by: Shivaprasad G Bhat <sbhat@linux.ibm.com>
Reviewed-by: Kyle Mahlkuch <kmahlkuc@linux.ibm.com>
Link: https://patch.msgid.link/177885270578.1573.14283751510936407585.stgit@linux.ibm.com
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>

0 files changed, 0 insertions, 0 deletions