Re: [v6 2/4] mpt3sas: Fix Sync cache command failure during driver unload

From: Bjorn Helgaas
Date: Tue Oct 30 2018 - 09:32:44 EST

On Tue, Oct 23, 2018 at 03:51:19PM +0530, Suganath Prabu wrote:
> This is to fix Sync cache and start stop command
> failures with DID_NO_CONNECT during driver unload.
> 1) Release drives first from SML, then remove internally
> in driver.
> 2) And allow sync cache and Start stop commands to firmware,
> even when remove_host flag is set

This looks like it should be two or maybe even three patches: (1) call
sas_remove_host() before releasing volumes and ports, (2) skipping
sas_port_delete_phy() and sas_port_delete() when ioc->remove_host (I'm not
sure if this is logically part of the sas_remove_host() change), and (3)
add _scsih_allow_scmd_to_device() -- this is purely mpt3sas-specific thing
independent of the SCSI midlayer.