linux-kernel - [PATCH] i2c: designware: Suppress error message if platform_get_irq() returns -EPROBE

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Date:	Tue,  3 Mar 2015 18:27:36 +0300
From:	Alexey Brodkin <Alexey.Brodkin@...opsys.com>
To:	linux-i2c@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org,
	Alexey Brodkin <Alexey.Brodkin@...opsys.com>,
	Vineet Gupta <Vineet.Gupta1@...opsys.com>,
	Christian Ruppert <christian.ruppert@...lis.com>,
	Mika Westerberg <mika.westerberg@...ux.intel.com>,
	Wolfram Sang <wsa@...-dreams.de>
Subject: [PATCH] i2c: designware: Suppress error message if platform_get_irq() returns -EPROBE_DEFER

There's no point in printing error message if platform_get_irq()
returns -EPROBE_DEFER because probe deferring subsystem already outputs
message in bootlog like this:
 --->8---
 platform e001d000.i2c: Driver i2c_designware requests probe deferral
 --->8---

Moreover in case of probe deferral following message may mislead user:
 --->8---
 i2c_designware e001d000.i2c: no irq resource?
 --->8---
even though it's expected that platform_get_irq() may return
-EPROBE_DEFER.

Signed-off-by: Alexey Brodkin <abrodkin@...opsys.com>
Cc: Vineet Gupta <vgupta@...opsys.com>
Cc: Christian Ruppert <christian.ruppert@...lis.com>
Cc: Mika Westerberg <mika.westerberg@...ux.intel.com>
Cc: Wolfram Sang <wsa@...-dreams.de>
---
 drivers/i2c/busses/i2c-designware-platdrv.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/i2c/busses/i2c-designware-platdrv.c b/drivers/i2c/busses/i2c-designware-platdrv.c
index c270f5f..01c1b17 100644
--- a/drivers/i2c/busses/i2c-designware-platdrv.c
+++ b/drivers/i2c/busses/i2c-designware-platdrv.c
@@ -144,7 +144,8 @@ static int dw_i2c_probe(struct platform_device *pdev)
 
 	irq = platform_get_irq(pdev, 0);
 	if (irq < 0) {
-		dev_err(&pdev->dev, "no irq resource?\n");
+		if (irq != -EPROBE_DEFER)
+			dev_err(&pdev->dev, "no irq resource?\n");
 		return irq; /* -ENXIO */
 	}
 
-- 
2.1.0

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