[PATCH v3] pwm: pwm-omap-dmtimer: return -EPROBE_DEFER if no dmtimer platform data

[PATCH v3] pwm: pwm-omap-dmtimer: return -EPROBE_DEFER if no dmtimer platform data

[David Rivshin]

From: David Rivshin <DRivshin@allworx.com>

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@vger.kernel.org> # 4.17+
Signed-off-by: David Rivshin <drivshin@allworx.com>
Acked-by: Pavel Machek <pavel@ucw.cz>
Tested-by: Pavel Machek <pavel@ucw.cz>
---
Changes in v3:
* Changed dev_info to dev_dbg
Changes in v2:
* Added Pavel's Acked-by/Tested-by [1]

[1] https://lkml.org/lkml/2018/7/16/346

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

diff --git a/drivers/pwm/pwm-omap-dmtimer.c b/drivers/pwm/pwm-omap-dmtimer.c
index 665da3c8fbceb..f45798679e3c0 100644
--- 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 platform_device *pdev)
 
 	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;
 	}
 

base-commit: acb1872577b346bd15ab3a3f8dff780d6cca4b70
-- 
2.17.1

[PATCH v3] pwm: pwm-omap-dmtimer: return -EPROBE_DEFER if no dmtimer platform data

[Andreas Kemnade]

Hi,

On Mon, 30 Jul 2018 18:30:30 -0400
David Rivshin <drivshin@awxrd.com> wrote:

> From: David Rivshin <DRivshin@allworx.com>
> 
> If a pwm-omap-dmtimer is probed before the dmtimer it uses, the platform
> data won't be set yet.
> 
you can of course have my Tested-by:
The version without message runs without trouble in daily use
here on top of 4.17.10. Did also some testing on 4.18-rc7 and I also tested this version. 

I personally have no strange feeling about what dev_XXX() you have.
I hope not too many other developers spend time to fix this just to find out
that something like this is already in review queue.

Regards,
Andreas
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