linux-kernel - Re: Regression in next with spi return from transfer

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Message-ID: <20181115234359.GJ53235@atomide.com>
Date:   Thu, 15 Nov 2018 15:44:00 -0800
From:   Tony Lindgren <tony@...mide.com>
To:     Mark Brown <broonie@...nel.org>
Cc:     Lubomir Rintel <lkundrak@...sk>,
        Geert Uytterhoeven <geert+renesas@...der.be>,
        Pavel Machek <pavel@....cz>, linux-kernel@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, linux-omap@...r.kernel.org
Subject: Re: Regression in next with spi return from transfer_one()

* Mark Brown <broonie@...nel.org> [181115 22:12]:
> On Thu, Nov 15, 2018 at 01:14:51PM -0800, Tony Lindgren wrote:
> 
> > Commit 810923f3bf06 ("spi: Deal with slaves that return from
> > transfer_one() unfinished") causes a regression at least on
> > droid 4 with SPI PMIC and regulators on the PMIC. During boot
> > the device just hangs there waiting for rootfs to appear on
> > MMC. Reverting 810923f3bf06 makes things work again.
> 
> > Any ideas why this might be?
> 
> Wow, that's not obvious...  as far as I can tell the code in the !slave
> case is identical so unless the controller is somehow getting mistakenly
> flagged as a slave it looks like it should be something to do with it
> being pushed into a function.  Could you try logging what the timeout
> ends up getting set to?

It seems to be caused because of the now missing "if (ret > 0) {"
line somehow that was there earlier. New code sets ms to 200 it
seems, then dmesg shows:

SPI transfer timed out

The old code is not updating ms and it's set to 1.

Regards,

Tony