Re: [PATCH] [SCSI] qla2xxx: Handle the INTx not connected while passing through

[Kyle Mahlkuch <kmahlkuc@linux.ibm.com>]

> 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.
> 
> The patch handles the case, and sets 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>

Hi Shiva,
Your changes look reasonable and fix a known bug.

Reviewed-by: Kyle Mahlkuch <kmahlkuc@linux.ibm.com>