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

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Message-ID: <20181030133239.GB41022@google.com>
Date:   Tue, 30 Oct 2018 08:32:39 -0500
From:   Bjorn Helgaas <helgaas@...nel.org>
To:     Suganath Prabu <suganath-prabu.subramani@...adcom.com>
Cc:     lukas@...ner.de, linux-scsi@...r.kernel.org,
        linux-pci@...r.kernel.org, linux-kernel@...r.kernel.org,
        benh@...nel.crashing.org, ruscur@...sell.cc,
        sbobroff@...ux.ibm.com, oohall@...il.com,
        andy.shevchenko@...il.com, Sathya.Prakash@...adcom.com,
        sreekanth.reddy@...adcom.com
Subject: Re: [v6 2/4] mpt3sas: Fix Sync cache command failure during driver
 unload

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.

Bjorn