linux-kernel - Re: [PATCH] scsi: mpt3sas: fix hang on ata passthru commands

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Date:   Thu, 29 Dec 2016 00:02:50 -0800
From:   Christoph Hellwig <hch@...radead.org>
To:     Jason Baron <jbaron@...mai.com>
Cc:     linux-scsi@...r.kernel.org, linux-kernel@...r.kernel.org,
        Sathya Prakash <sathya.prakash@...adcom.com>,
        Chaitra P B <chaitra.basappa@...adcom.com>,
        Suganath Prabu Subramani 
        <suganath-prabu.subramani@...adcom.com>,
        Sreekanth Reddy <Sreekanth.Reddy@...adcom.com>,
        Hannes Reinecke <hare@...e.de>,
        "Martin K. Petersen" <martin.petersen@...cle.com>,
        Bart Van Assche <bart.vanassche@...disk.com>,
        Sagi Grimberg <sagi@...mberg.me>,
        James Bottomley <jejb@...ux.vnet.ibm.com>,
        Christoph Hellwig <hch@....de>,
        Doug Ledford <dledford@...hat.com>,
        David Miller <davem@...emloft.net>
Subject: Re: [PATCH] scsi: mpt3sas: fix hang on ata passthru commands

On Wed, Dec 28, 2016 at 11:30:24PM -0500, Jason Baron wrote:
> Add a new parameter to scsi_internal_device_block() to decide whether
> or not to invoke scsi_wait_for_queuecommand().

We'll also need to deal with the blk-mq wait path that Bart has been
working on (I think it's already in the scsi tree, but I'd have to
check).

Also adding a bool flag for the last call in a function is style that's
a little annoying.

I'd prefer to add a scsi_internal_device_block_nowait that contains
all the code except for the waiting, and then make
scsi_internal_device_block_nowait a wrapper around it.  Or drop the
annoying internal for both while we're at it :)