linux-kernel - [PATCH 4.18 105/145] pwm: omap-dmtimer: Return -EPROBE

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Date:   Fri,  7 Sep 2018 23:09:31 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, David Rivshin <drivshin@...worx.com>,
        Pavel Machek <pavel@....cz>,
        Ladislav Michl <ladis@...ux-mips.org>,
        Andreas Kemnade <andreas@...nade.info>,
        Thierry Reding <thierry.reding@...il.com>
Subject: [PATCH 4.18 105/145] pwm: omap-dmtimer: Return -EPROBE_DEFER if no dmtimer platform data

4.18-stable review patch.  If anyone has any objections, please let me know.

------------------

From: David Rivshin <DRivshin@...worx.com>

commit 43725feb593127b16318b871e3a9bf89a96d66cb upstream.

If a pwm-omap-dmtimer is probed before the dmtimer it uses, the platform
data won't be set yet.

Fixes: ac30751df953 ("ARM: OMAP: pdata-quirks: Remove unused timer pdata")
Cc: <stable@...r.kernel.org> # 4.17+
Signed-off-by: David Rivshin <drivshin@...worx.com>
Acked-by: Pavel Machek <pavel@....cz>
Tested-by: Pavel Machek <pavel@....cz>
Acked-by: Ladislav Michl <ladis@...ux-mips.org>
Tested-by: Andreas Kemnade <andreas@...nade.info>
Signed-off-by: Thierry Reding <thierry.reding@...il.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/pwm/pwm-omap-dmtimer.c |    5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

--- a/drivers/pwm/pwm-omap-dmtimer.c
+++ b/drivers/pwm/pwm-omap-dmtimer.c
@@ -264,8 +264,9 @@ static int pwm_omap_dmtimer_probe(struct
 
 	timer_pdata = dev_get_platdata(&timer_pdev->dev);
 	if (!timer_pdata) {
-		dev_err(&pdev->dev, "dmtimer pdata structure NULL\n");
-		ret = -EINVAL;
+		dev_dbg(&pdev->dev,
+			 "dmtimer pdata structure NULL, deferring probe\n");
+		ret = -EPROBE_DEFER;
 		goto put;
 	}