[PATCH] lpfc: Fix panic on BFS configuration.

[James Smart]

Please disregard this patch. there is an issue in the fix

-- james


On 4/21/2017 5:24 PM, jsmart2021 at gmail.com wrote:
> From: James Smart <jsmart2021 at gmail.com>
>
> To select the appropriate shost template, the driver is issuing
> a mailbox command to retrieve the wwn. Turns out the sending of
> the command precedes the reset of the function.  On SLI-4 adapters,
> this is inconsequential as the mailbox command location is specified
> by dma via the BMBX register. However, on SLI-3 adapters, the
> location of the mailbox command submission area changes. When the
> function is first powered on or reset, the cmd is submitted via PCI
> bar memory. Later the driver changes the function config to use
> host memory and DMA. The request to start a mailbox command is the
> same, a simple doorbell write, regardless of submission area.
> So.. if there has not been a boot driver run against the adapter,
> the mailbox command works as defaults are ok. But, if the boot
> driver has configured the card and, and if no platform pci
> function/slot reset occurs as the os starts, the mailbox command
> will fail. The SLI-3 device will use the stale boot driver dma
> location. This can cause PCI eeh errors.
>
> Fix is to reset the sli-3 function before sending the
> mailbox command, thus synchronizing the function/driver on mailbox
> location.
>
> This issue was introduced by this patch:
> http://www.spinics.net/lists/linux-scsi/msg105908.html
> which is in the stable pools with commit id:
> 96418b5e2c8867da3279d877f5d1ffabfe460c3d
>
> This patch needs to be applied to the stable trees where ever the
> introducing patch exists.
>
> Signed-off-by: Dick Kennedy <dick.kennedy at broadcom.com>
> Signed-off-by: James Smart <james.smart at broadcom.com>
> Cc: stable at vger.kernel.org