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

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Date:   Thu, 15 Nov 2018 16:01:54 -0800
From:   Mark Brown <broonie@...nel.org>
To:     Tony Lindgren <tony@...mide.com>
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()

On Thu, Nov 15, 2018 at 03:44:00PM -0800, Tony Lindgren wrote:

> 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:

Doh, of course :(  Sorry I missed that.

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

Right, and not waiting either which should be the issue.  Does the
following work:

diff --git a/drivers/spi/spi.c b/drivers/spi/spi.c
index 498d3b9bf3ae..430ad637c643 100644
--- a/drivers/spi/spi.c
+++ b/drivers/spi/spi.c
@@ -1114,9 +1114,11 @@ static int spi_transfer_one_message(struct spi_controller *ctlr,
 				goto out;
 			}
 
-			ret = spi_transfer_wait(ctlr, msg, xfer);
-			if (ret < 0)
-				msg->status = ret;
+			if (ret > 0) {
+				ret = spi_transfer_wait(ctlr, msg, xfer);
+				if (ret < 0)
+					msg->status = ret;
+			}
 		} else {
 			if (xfer->len)
 				dev_err(&msg->spi->dev,

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