[PATCH 3/6] cxlflash: Fix to avoid EEH and host reset collisions

[Uma Krishnan]

On 9/2/2016 3:39 PM, Uma Krishnan wrote:
> From: "Matthew R. Ochs" <mrochs at linux.vnet.ibm.com>
>
> The EEH reset handler is ignorant to the current state of the
> driver when processing a frozen event and initiating a device
> reset. This can be an issue if an EEH event occurs while a user
> or stack initiated reset is executing. More specifically, if an
> EEH occurs while the SCSI host reset handler is active, the reset
> initiated by the EEH thread will likely collide with the host reset
> thread. This can leave the device in an inconsistent state, or worse,
> cause a system crash.
>
> As a remedy, the EEH handler is updated to evaluate the device state
> and take appropriate action (proceed, wait, or disconnect host). The
> host reset handler is also updated to handle situations where an EEH
> occurred during a host reset. In such situations, the host reset handler
> will delay reporting back a success to give the EEH reset an opportunity
> to complete.
>
> Signed-off-by: Matthew R. Ochs <mrochs at linux.vnet.ibm.com>

Acked-by: Uma Krishnan <ukrishn at linux.vnet.ibm.com>