linux-kernel - Re: [RFC PATCH 00/13] Switchtec NTB Support

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Date:   Mon, 19 Jun 2017 14:27:41 -0600
From:   Logan Gunthorpe <logang@...tatee.com>
To:     Jon Mason <jdmason@...zu.us>
Cc:     linux-ntb@...glegroups.com, linux-pci@...r.kernel.org,
        linux-kernel@...r.kernel.org, Dave Jiang <dave.jiang@...el.com>,
        Allen Hubbe <Allen.Hubbe@....com>,
        Bjorn Helgaas <bhelgaas@...gle.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Kurt Schwemmer <kurt.schwemmer@...rosemi.com>,
        Stephen Bates <sbates@...thlin.com>
Subject: Re: [RFC PATCH 00/13] Switchtec NTB Support



On 19/06/17 02:07 PM, Jon Mason wrote:
> I think this code is of quality enough to go from an RFC to a standard
> patch, and we can nit pick it to death there ;-)

Thanks!

> Please rebase on ntb-next (which I believe you are already doing), and
> resbutmit.

I'll try to get the rebase done and all the feedback so far applied by
the end of the week and resend a v1.

> I'm thinking that we'll want to keep this series all in one place.
> So, #2 sounds like the best option.  But, I need Bjorns $0.02 on this.

I was thinking #2 was the best choice as well but really it's for you
maintainers to decide. And, yes, we'd want to get Bjorn's ack.

> FYI, I ran smatch on the patches and got this.  Please correct them in
> v2 (or v1 of the non-RFC...however you want to think of it).
> drivers/pci/switch/switchtec.c:484 switchtec_dev_read() error: double unlock 'mutex:&stdev->mrpc_mutex'
> drivers/pci/switch/switchtec.c:506 switchtec_dev_read() error: double unlock 'mutex:&stdev->mrpc_mutex'
> drivers/pci/switch/switchtec.c:513 switchtec_dev_read() warn: inconsistent returns 'mutex:&stdev->mrpc_mutex'.

This looks like a false positive to me. The code looks correct. smatch
may have been confused by the fact that the lock is taken by two calls
to the static function 'lock_mutex_and_test_alive'.

This is also part of the switchtec management driver that's already in
the kernel and not part of the NTB related patches I sent.

Logan